Basics Of Chemistry Exam: Quiz!

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Basics Of Chemistry Exam: Quiz! - Quiz


Do you like chemistry? Chemistry is the systematic discipline concerned with elements and compounds that are made up of matter. It studies their composition, structure properties, behavior, and transformations during exposure to other substances. It explores the way that these substances react, unite and change. They utilize unique processes to facilitate the conception of new materials. This quiz is for anyone who is learning about chemistry. This quiz can be helpful. Go for it.


Questions and Answers
  • 1. 

    The rapid oxidation of a substance, accompanied by the production of heat and light is called?

    • A.

      Combustion

    • B.

      Reduction

    • C.

      Emulsification

    • D.

      Ionization

    Correct Answer
    A. Combustion
    Explanation
    Combustion is the correct answer because it refers to the rapid oxidation of a substance, which is accompanied by the production of heat and light. During combustion, a substance reacts with oxygen to release energy in the form of heat and light. This process is commonly observed in fire, where a fuel combines with oxygen to produce heat and light energy. Reduction, emulsification, and ionization do not involve the production of heat and light through rapid oxidation, making them incorrect choices.

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  • 2. 

    Which of the following is NOT a physical mixture?

    • A.

      Element

    • B.

      Solution

    • C.

      Suspension

    • D.

      Emulsion

    Correct Answer
    A. Element
    Explanation
    An element is not a physical mixture because it is a pure substance that cannot be broken down into simpler substances by physical means. It consists of only one type of atom and cannot be separated into different components. In contrast, a solution, suspension, and emulsion are all physical mixtures where two or more substances are combined but can be separated by physical means.

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  • 3. 

    Two or more immiscible substances combine with a special binding ingredient to create a(n)?

    • A.

      Emulsion

    • B.

      Solution

    • C.

      Suspension

    • D.

      Solvent 

    Correct Answer
    A. Emulsion
    Explanation
    An emulsion is formed when two or more immiscible substances are combined with a special binding ingredient. In an emulsion, the immiscible substances are dispersed in small droplets throughout the mixture, creating a stable and uniform mixture. This is different from a solution, where the substances are completely dissolved in each other, or a suspension, where the substances are not fully dissolved and tend to settle over time. A solvent, on the other hand, is a substance that dissolves other substances to form a solution.

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  • 4. 

    When acids & alkalis are mixed together in equal proportions, they form?

    • A.

      Water 

    • B.

      Salt

    • C.

      Carbon

    • D.

      Nitrogen

    Correct Answer
    A. Water 
    Explanation
    When acids and alkalis are mixed together in equal proportions, they undergo a neutralization reaction. This reaction results in the formation of water and a salt. Therefore, the correct answer is water.

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  • 5. 

    Any substance that occupies space & has mass (weight) is considered?

    • A.

      Matter

    • B.

      Light

    • C.

      Energy

    • D.

      Carbon

    Correct Answer
    A. Matter
    Explanation
    Matter is the correct answer because it refers to any substance that has both mass and occupies space. Matter can exist in various forms such as solids, liquids, and gases. It is the physical material that makes up everything in the universe, including living organisms, planets, and stars. Light and energy, on the other hand, do not have mass and do not occupy space in the same way that matter does. Carbon is a specific element and is considered a type of matter.

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  • 6. 

    Which of the following is an example of a chemical property?

    • A.

      Glossiness

    • B.

      Solubility

    • C.

      Melting point

    • D.

      Ability of wood to burn

    Correct Answer
    D. Ability of wood to burn
    Explanation
    The ability of wood to burn is an example of a chemical property because it describes how wood reacts with oxygen in the presence of heat to undergo a chemical change, resulting in the release of energy in the form of fire. Chemical properties involve the behavior of a substance when it undergoes a chemical reaction or interacts with other substances, and the ability of wood to burn fits this definition. Glossiness, solubility, and melting point are examples of physical properties, which describe the characteristics of a substance without involving a chemical change.

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  • 7. 

    If two liquids are mutually soluble, they are considered?

    • A.

      Miscible

    • B.

      Immiscible

    • C.

      Suspensions

    • D.

      Pure

    Correct Answer
    A. Miscible
    Explanation
    If two liquids are mutually soluble, it means that they can dissolve in each other in any proportion. This property is known as miscibility. Therefore, the correct answer is "Miscible".

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  • 8. 

    A(n) _________ releases a significant amount of heat?

    • A.

      Exothermic reaction

    • B.

      Chemical change

    • C.

      Physical change

    • D.

      Endothermic reaction

    Correct Answer
    A. Exothermic reaction
    Explanation
    An exothermic reaction releases a significant amount of heat. In this type of reaction, the energy released from the reaction is greater than the energy required to initiate it. As a result, heat is given off to the surroundings, causing an increase in temperature. This is in contrast to an endothermic reaction, where heat is absorbed from the surroundings, resulting in a decrease in temperature. Chemical and physical changes can also release or absorb heat, but the term "exothermic reaction" specifically refers to a chemical reaction that releases heat.

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  • 9. 

    A(n) ________ is an alkaline substance used to neutralize acids or raise the pH of hair products?

    • A.

      Volatile alcohol

    • B.

      Glycerin

    • C.

      Alkanolamine

    • D.

      Silicone

    Correct Answer
    C. Alkanolamine
    Explanation
    Alkanolamine is an alkaline substance commonly used in hair products to neutralize acids or increase the pH level. It helps in balancing the acidity of the product and prevents any potential damage to the hair. Volatile alcohol, glycerin, and silicone are not specifically used for neutralizing acids or raising the pH in hair products.

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  • 10. 

    Characteristics of matter that do NOT involve chemically changing a substance are called __________ properties.

    • A.

      Static

    • B.

      Primary

    • C.

      Physical

    • D.

      Chemical

    Correct Answer
    C. Physical
    Explanation
    Physical properties of matter are those that can be observed or measured without changing the chemical composition of the substance. These properties include characteristics such as color, density, melting point, boiling point, and conductivity. Unlike chemical properties, which involve the ability of a substance to undergo a chemical reaction and change into a different substance, physical properties only describe the physical state or behavior of a substance. Therefore, the correct answer is "Physical."

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  • 11. 

    Volatile organic compounds contain ________ & evaporate very easily.

    • A.

      Carbon

    • B.

      Nitrogen

    • C.

      Oxygen

    • D.

      Hydrogen

    Correct Answer
    A. Carbon
    Explanation
    Volatile organic compounds contain carbon and evaporate very easily. Carbon is a key element in organic compounds, and its presence allows these compounds to have a high vapor pressure and easily transition from a liquid or solid state to a gas. This property makes volatile organic compounds highly volatile and prone to evaporating at normal temperatures and pressures.

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  • 12. 

    When stored under ideal conditions, a properly formulated emulsion can be stable for up to?

    • A.

      6 months

    • B.

      1 year 

    • C.

      3 years

    • D.

      3 months

    Correct Answer
    C. 3 years
    Explanation
    A properly formulated emulsion can be stable for up to 3 years when stored under ideal conditions. Emulsions are mixtures of two immiscible liquids, such as oil and water, stabilized by an emulsifying agent. Stability refers to the ability of the emulsion to maintain its physical and chemical properties over time without separating or deteriorating. Ideal storage conditions typically include keeping the emulsion at a controlled temperature, protecting it from light and oxygen, and preventing contamination. With proper formulation and storage, the emulsion can maintain its stability for a longer period of time, in this case, up to 3 years.

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  • 13. 

    Matter does NOT exist in which form?

    • A.

      Solid

    • B.

      Liquid

    • C.

      Gas

    • D.

      Energy

    Correct Answer
    D. Energy
    Explanation
    Matter exists in the form of solid, liquid, and gas. Energy, on the other hand, is not considered matter as it does not have mass or occupy space. Energy is a property or characteristic of matter and can exist in various forms such as kinetic energy, potential energy, thermal energy, etc. Therefore, energy is not a form of matter.

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  • 14. 

    A chemical combination of two or more atoms of different elements in definite proportions is a(n)?

    • A.

      Elemental molecule

    • B.

      Ion

    • C.

      Element

    • D.

      Compound

    Correct Answer
    D. Compound
    Explanation
    A compound is a chemical combination of two or more atoms of different elements in definite proportions. It is formed through a chemical reaction and has its own unique properties different from the elements that make it up. Compounds can be represented by chemical formulas and can exist as solids, liquids, or gases. Examples of compounds include water (H2O), sodium chloride (NaCl), and carbon dioxide (CO2).

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  • 15. 

    The term pH represents the quantity of _______ ions.

    • A.

      Nitrogen

    • B.

      Hydrogen

    • C.

      Carbon

    • D.

      Oxygen

    Correct Answer
    B. Hydrogen
    Explanation
    The term pH represents the quantity of hydrogen ions. pH is a measure of the acidity or alkalinity of a solution, and it is determined by the concentration of hydrogen ions present. A low pH indicates a high concentration of hydrogen ions, making the solution acidic, while a high pH indicates a low concentration of hydrogen ions, making the solution alkaline. Therefore, the correct answer is hydrogen.

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  • 16. 

    Pure water has a pH of?

    • A.

      10

    • B.

      5

    • C.

      7

    • D.

      0

    Correct Answer
    C. 7
    Explanation
    Pure water has a pH of 7 because it is considered neutral. The pH scale ranges from 0 to 14, with values below 7 being acidic and values above 7 being alkaline. Pure water contains an equal concentration of hydrogen ions (H+) and hydroxide ions (OH-), resulting in a balanced pH level.

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  • 17. 

    A reducing agent is a substance that adds _______ to a chemical compound or subtracts oxygen from the compound.

    • A.

      Carbon

    • B.

      Nitrogen

    • C.

      Potassium

    • D.

      Hydrogen 

    Correct Answer
    D. Hydrogen 
    Explanation
    A reducing agent is a substance that adds electrons to a chemical compound or subtracts oxygen from the compound. Hydrogen is a commonly used reducing agent because it has a high affinity for electrons and can easily donate them to other compounds, thereby reducing them. This process is known as reduction, and it is important in various chemical reactions such as the reduction of metal ores or the conversion of aldehydes to alcohols.

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  • 18. 

    An elemental molecule is a molecule containing?

    • A.

      Two or more atoms of the same element in definite proportions

    • B.

      A single atom

    • C.

      Two or more atoms of two different element in definite proportions

    • D.

      Two or more atoms of the same element in indefinite proportions

    Correct Answer
    A. Two or more atoms of the same element in definite proportions
    Explanation
    An elemental molecule refers to a molecule that consists of two or more atoms of the same element. These atoms are bonded together in a specific and fixed ratio or proportion. This means that the composition of the molecule is consistent and predictable, with a definite number of atoms of the same element. This is different from a molecule that contains atoms of different elements or a single atom, which are not considered elemental molecules.

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  • 19. 

    There are ________ naturally occurring elements.

    • A.

      79

    • B.

      118

    • C.

      131

    • D.

      98

    Correct Answer
    D. 98
    Explanation
    The periodic table currently consists of 118 known elements. However, not all of these elements occur naturally. Some elements have only been created in laboratories and do not exist in nature. Therefore, the correct answer is 98, as there are 98 naturally occurring elements.

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  • 20. 

    A(n) _________ is the basic unit of matter.

    • A.

      Protons

    • B.

      Molecule

    • C.

      Cell

    • D.

      Atom

    Correct Answer
    D. Atom
    Explanation
    An atom is the basic unit of matter because it is the smallest particle of an element that retains the chemical properties of that element. Atoms are composed of subatomic particles, including protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus of an atom, but they alone do not make up the entire atom. A molecule is a group of atoms bonded together, and a cell is the basic structural and functional unit of all living organisms. Therefore, the correct answer is atom.

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  • 21. 

    Protons are subatomic particles with which type of charge?

    • A.

      Sometimes positive, sometimes negative 

    • B.

      Positive

    • C.

      Neutral

    • D.

      Negative

    Correct Answer
    B. Positive
    Explanation
    Protons are subatomic particles that carry a positive charge. They are found in the nucleus of an atom and are one of the fundamental particles that make up an atom. Unlike electrons, which carry a negative charge, protons have a positive charge. This positive charge is equal in magnitude to the negative charge of an electron, making an atom electrically neutral when the number of protons and electrons are equal.

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  • 22. 

    Only products that contain ______ can have a pH.

    • A.

      Silicon

    • B.

      Water

    • C.

      Potassium

    • D.

      Carbon

    Correct Answer
    B. Water
    Explanation
    Only products that contain water can have a pH. pH is a measure of the acidity or alkalinity of a solution, and it is specifically used to measure the concentration of hydrogen ions in a solution. Since water is a solvent that can dissociate into hydrogen ions (H+) and hydroxide ions (OH-), it can have a pH value. Other substances like silicon, potassium, and carbon do not have the ability to dissociate into ions and therefore cannot have a pH.

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  • 23. 

    The _______ is the substance that is dissolved into a solution.

    • A.

      Solvent

    • B.

      Surfactant

    • C.

      Emulsion

    • D.

      Solute

    Correct Answer
    D. Solute
    Explanation
    The solute is the substance that is dissolved into a solution. In a solution, the solute is the component that is present in a smaller amount and gets dissolved by the solvent. The solvent, on the other hand, is the component that is present in a larger amount and dissolves the solute. Therefore, the solute is the correct answer as it accurately describes the substance that is dissolved in a solution.

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  • 24. 

    An oxidizing agent:

    • A.

      Transforms another element into oxygen

    • B.

      Absorbs oxygen

    • C.

      Release oxygen

    • D.

      Transform oxygen into another element

    Correct Answer
    C. Release oxygen
    Explanation
    An oxidizing agent is a substance that causes another substance to lose electrons, resulting in the oxidation of that substance. In this case, the correct answer is "Release oxygen" because an oxidizing agent is able to transfer oxygen atoms or molecules to another substance, causing it to oxidize. This process involves the oxidizing agent giving up oxygen atoms or molecules, hence releasing oxygen.

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  • 25. 

    Substances lacking the element ______ are classified as inorganic.

    • A.

      Carbon

    • B.

      Hydrogen

    • C.

      Silicone

    • D.

      Oxygen

    Correct Answer
    A. Carbon
    Explanation
    Substances lacking the element carbon are classified as inorganic. Carbon is a key element in organic compounds, which are the building blocks of living organisms. Inorganic substances, on the other hand, do not contain carbon and are typically minerals or non-living materials. Therefore, the absence of carbon is a defining characteristic of inorganic substances.

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  • 26. 

    A water-in-oil emulsion:

    • A.

      Is a type of powder

    • B.

      Does not feel greasy

    • C.

      Has water droplets emulsified in oil

    • D.

      Has oil droplets emulsified in water

    Correct Answer
    C. Has water droplets emulsified in oil
    Explanation
    A water-in-oil emulsion refers to a type of mixture where water droplets are dispersed and emulsified within the oil phase. This means that small droplets of water are evenly distributed throughout the oil, forming a stable emulsion. This type of emulsion is commonly used in various cosmetic and pharmaceutical products, as it provides a non-greasy feel while still incorporating the benefits of water.

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  • 27. 

    Which of the following is a colorless gas with a pungent odor composed of hydrogen & nitrogen?

    • A.

      Alkanolamine

    • B.

      Silicone

    • C.

      Glycerin

    • D.

      Ammonia

    Correct Answer
    D. Ammonia
    Explanation
    Ammonia is a colorless gas with a pungent odor composed of hydrogen and nitrogen. It is commonly used in cleaning products and fertilizers. Ammonia is highly soluble in water and is known for its characteristic smell. It is toxic and can cause irritation to the eyes, nose, and respiratory system if inhaled in high concentrations.

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  • 28. 

    An ion with a positive electrical charger is called a(n)?

    • A.

      Base

    • B.

      Anion

    • C.

      Alkali

    • D.

      Cation

    Correct Answer
    D. Cation
    Explanation
    A cation is an ion with a positive electrical charge. It is formed when an atom loses one or more electrons. Cations are attracted to negatively charged particles and are commonly found in ionic compounds. Therefore, the correct answer is Cation.

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  • 29. 

    Steam is an example of a?

    • A.

      Vapor

    • B.

      Liquid

    • C.

      Solid

    • D.

      Ion

    Correct Answer
    A. Vapor
    Explanation
    Steam is an example of a vapor because it is the gaseous form of water that is formed when water is heated to its boiling point and undergoes a phase change from liquid to gas. Vapor refers to the gas phase of a substance, typically at a temperature below its critical point, and steam specifically refers to water vapor.

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  • 30. 

    A(n) ______ is a chemical combination of two or more atoms in definite (fixed) proportions.

    • A.

      Cell

    • B.

      Ion

    • C.

      Element

    • D.

      Molecule

    Correct Answer
    D. Molecule
    Explanation
    A molecule is a chemical combination of two or more atoms in definite (fixed) proportions. It is formed when atoms are bonded together through chemical bonds. Molecules can be made up of atoms of the same element or different elements. They are the smallest unit of a compound that retains the chemical properties of that compound. Therefore, a molecule fits the description of a chemical combination of atoms in fixed proportions.

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  • 31. 

    Which of the following is an oily substance used as a moisturizer in skin & body creams?

    • A.

      Silicone

    • B.

      Glycerin

    • C.

      Ammonia

    • D.

      Alkanolamine

    Correct Answer
    B. Glycerin
    Explanation
    Glycerin is an oily substance commonly used as a moisturizer in skin and body creams. It helps to attract and retain moisture in the skin, making it feel soft and hydrated. Glycerin is a natural humectant, meaning it draws moisture from the environment and helps to prevent water loss from the skin. It is a popular ingredient in skincare products due to its hydrating properties and ability to improve the skin's barrier function.

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  • 32. 

    Sodium Hydroxide, commonly known as ___________, is a very strong alkali used in chemical hair relaxer, callous softeners & drain cleaners.

    • A.

      Hydrogen Peroxide

    • B.

      Salt

    • C.

      Bleach

    • D.

      Lye

    Correct Answer
    D. Lye
    Explanation
    Sodium Hydroxide, commonly known as lye, is a very strong alkali used in chemical hair relaxer, callous softeners, and drain cleaners. Lye is known for its caustic properties and ability to break down organic matter, making it an effective ingredient in these products. It is important to handle lye with caution due to its corrosive nature.

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  • 33. 

    A substance’s state of matter depends on its?

    • A.

      Temperature

    • B.

      Size

    • C.

      Atomic number

    • D.

      Electrical charge

    Correct Answer
    A. Temperature
    Explanation
    The state of matter of a substance is determined by its temperature. Temperature is a measure of the average kinetic energy of the particles in a substance. At low temperatures, particles move slower and are closer together, leading to a solid state. As the temperature increases, particles gain more energy and move more freely, resulting in a liquid state. At even higher temperatures, the particles have enough energy to overcome the attractive forces between them, leading to a gaseous state. Therefore, temperature is the crucial factor in determining the state of matter.

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  • 34. 

    A(n) ________ is an unstable physical mixture of undissolved particles in a liquid.

    • A.

      Solvent

    • B.

      Emulsion

    • C.

      Solution

    • D.

      Suspension 

    Correct Answer
    D. Suspension 
    Explanation
    A suspension is an unstable physical mixture of undissolved particles in a liquid. In a suspension, the particles are larger and can be seen with the naked eye. They do not dissolve in the liquid but instead remain suspended, giving the liquid a cloudy or hazy appearance. Over time, the particles in a suspension will settle at the bottom of the container, making it necessary to shake or stir the mixture before use.

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  • 35. 

    A _________ is a substance that allows oils & water to mix, or emulsify.

    • A.

      Surfactant

    • B.

      Reducing agent

    • C.

      Solute

    • D.

      Solvent

    Correct Answer
    A. Surfactant
    Explanation
    A surfactant is a substance that allows oils and water to mix, or emulsify. Surfactants have both hydrophilic (water-loving) and hydrophobic (oil-loving) properties, which enable them to lower the surface tension between oil and water, allowing them to mix more easily. This property makes surfactants commonly used in various industries, such as cleaning products, cosmetics, and pharmaceuticals, where emulsification is required. Surfactants work by forming micelles, which are tiny structures that surround and suspend oil droplets in water, preventing them from separating.

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  • 36. 

    Rubbing alcohol & hair spray are examples of?

    • A.

      Ammonias

    • B.

      Silicones

    • C.

      Volatile alcohols

    • D.

      Alkanolamines

    Correct Answer
    C. Volatile alcohols
    Explanation
    Rubbing alcohol and hair spray are examples of volatile alcohols. Volatile alcohols are alcohols that easily evaporate at room temperature. Rubbing alcohol, also known as isopropyl alcohol, is commonly used as a disinfectant and antiseptic. Hair spray contains alcohol as a solvent, which helps it dry quickly and hold the hair in place. Both rubbing alcohol and hair spray demonstrate the characteristic of being volatile, as they evaporate rapidly when exposed to air.

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  • 37. 

    Which of the following is a special type of oil used in water-resistant lubricants for the skin?

    • A.

      Alkanolamine

    • B.

      Silicone

    • C.

      Glycerin

    • D.

      Ammonia

    Correct Answer
    B. Silicone
    Explanation
    Silicone is a special type of oil used in water-resistant lubricants for the skin. It is commonly used in cosmetic and skincare products because of its ability to create a protective barrier on the skin's surface, preventing moisture loss and keeping the skin hydrated. Silicone-based oils are lightweight, non-greasy, and have a smooth texture, making them ideal for use in water-resistant products such as sunscreens, moisturizers, and foundations. They also help to improve the spreadability and longevity of these products on the skin.

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  • 38. 

    Ointments, Pastes & Pomades are?

    • A.

      Powders

    • B.

      Emulsions

    • C.

      Solutions

    • D.

      Semisolid Mixtures 

    Correct Answer
    D. Semisolid Mixtures 
    Explanation
    Ointments, pastes, and pomades are classified as semisolid mixtures. Semisolid mixtures have a consistency that is between that of a solid and a liquid. They are typically thick and have a greasy or oily texture. Ointments, pastes, and pomades are commonly used in skincare and medical applications as they provide a barrier on the skin and can be easily applied and spread.

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  • 39. 

    A chemical combination of matter in definite (fixed) proportions is called a(n)?

    • A.

      Physical mixture

    • B.

      Emulsion

    • C.

      Compound

    • D.

      Pure substance

    Correct Answer
    D. Pure substance
    Explanation
    A pure substance is a chemical combination of matter in definite (fixed) proportions. It consists of only one type of particle, either atoms or molecules, and cannot be separated into simpler components by physical means. This is different from a physical mixture, which is a combination of substances that can be separated by physical methods. An emulsion is a type of physical mixture in which one liquid is dispersed in another. A compound is a pure substance composed of two or more elements chemically combined in fixed proportions.

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  • 40. 

    An atom or molecule that carries an electrical charge is called a(n)?

    • A.

      Ion

    • B.

      Anion

    • C.

      Alkali

    • D.

      Cation

    Correct Answer
    A. Ion
    Explanation
    An ion is an atom or molecule that carries an electrical charge. It can either be positively charged (cation) or negatively charged (anion), depending on the gain or loss of electrons. Alkali is a group of elements in the periodic table and is not specifically related to carrying an electrical charge. Therefore, the correct answer is ion.

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  • 41. 

    In an oxidation-reduction reaction?

    • A.

      Neither oxidation nor reduction occurs

    • B.

      Oxidation occurs before reduction

    • C.

      Reduction occurs before oxidation

    • D.

      Oxidation & reduction occurs simultaneously

    Correct Answer
    D. Oxidation & reduction occurs simultaneously
    Explanation
    In an oxidation-reduction reaction, both oxidation and reduction occur simultaneously. This means that while one substance is being oxidized (losing electrons), another substance is being reduced (gaining electrons). These reactions involve the transfer of electrons from one substance to another, resulting in a change in oxidation states. Therefore, it is incorrect to say that neither oxidation nor reduction occurs, or that oxidation occurs before reduction, or that reduction occurs before oxidation.

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  • 42. 

    A(n) ______ is a substance that dissolves another substance to form a solution.

    • A.

      Solvent

    • B.

      Solute

    • C.

      Element

    • D.

      Emulsifier

    Correct Answer
    A. Solvent
    Explanation
    A solvent is a substance that dissolves another substance to form a solution. Solvents have the ability to break down the bonds between molecules in a solute, allowing the solute to disperse evenly throughout the solvent. This process is known as dissolution. Solvents are commonly used in various industries such as cleaning, manufacturing, and pharmaceuticals, where they are used to dissolve and extract desired compounds or substances.

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  • 43. 

    Which of the following, also called a base, is a compound that reacts with acids to form salts?

    • A.

      Alkali

    • B.

      Emulsifier

    • C.

      Anion

    • D.

      Cation

    Correct Answer
    A. Alkali
    Explanation
    Alkali is the correct answer because it is a compound that reacts with acids to form salts. Alkalis are typically hydroxides of alkali metals such as sodium hydroxide or potassium hydroxide. When an alkali reacts with an acid, a neutralization reaction occurs, resulting in the formation of a salt and water. This is a characteristic property of alkalis, making them the compounds that react with acids to form salts.

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  • 44. 

    A stable physical mixture of two or more substances is a(n)?

    • A.

      Suspension

    • B.

      Solution

    • C.

      Element

    • D.

      Emulsion

    Correct Answer
    B. Solution
    Explanation
    A solution is a stable physical mixture of two or more substances. In a solution, the solute is evenly distributed and dissolved in the solvent, resulting in a homogeneous mixture. This means that the particles of the solute are dispersed at a molecular level throughout the solvent, creating a uniform composition. Solutions can be formed with various combinations of substances, such as solids dissolved in liquids, gases dissolved in liquids, or even gases dissolved in other gases.

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  • 45. 

    The study of substances that contain carbon Is called _____________ chemistry.

    • A.

      Structural

    • B.

      Inorganic

    • C.

      Natural

    • D.

      Organic

    Correct Answer
    D. Organic
    Explanation
    The study of substances that contain carbon is called organic chemistry. Organic chemistry focuses on the structure, properties, composition, reactions, and synthesis of carbon-containing compounds. This branch of chemistry is essential in understanding and developing various fields such as pharmaceuticals, polymers, dyes, and materials science. Organic chemistry is distinct from inorganic chemistry, which studies compounds that do not contain carbon.

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  • 46. 

    A _________ is a physical combination of matter in any proportions.

    • A.

      Compound

    • B.

      Solvent

    • C.

      Pure substance

    • D.

      Physical mixture

    Correct Answer
    D. Physical mixture
    Explanation
    A physical mixture refers to a combination of matter in any proportions without any chemical bonding between the components. In a physical mixture, the substances retain their individual properties and can be easily separated by physical means. This is different from a compound, which is formed when two or more elements chemically combine in fixed proportions, resulting in a new substance with different properties. A solvent is a substance capable of dissolving other substances, while a pure substance consists of only one type of particle and cannot be separated into simpler substances by physical means.

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  • 47. 

    Which statement about surfactant molecules is correct?

    • A.

      The head & tail are both hydrophilic

    • B.

      The head is hydrophilic & the tail is lipophilic

    • C.

      The head is lipophilic & the tail is hydrophilic

    • D.

      The head & tail are both lipophilic

    Correct Answer
    B. The head is hydrophilic & the tail is lipophilic
    Explanation
    Surfactant molecules have a polar head and a nonpolar tail. The polar head is hydrophilic, meaning it is attracted to water molecules, while the nonpolar tail is lipophilic, meaning it is attracted to lipid or oil molecules. This arrangement allows surfactant molecules to lower the surface tension between water and oil, making them effective at emulsifying and dispersing oil in water.

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  • 48. 

    Nail polish is an example of a(n)?

    • A.

      Solution

    • B.

      Suspension

    • C.

      Surfactant

    • D.

      Emulsion

    Correct Answer
    B. Suspension
    Explanation
    Nail polish is classified as a suspension because it consists of solid particles (pigments) suspended in a liquid medium (solvent). When nail polish is applied, the solid particles are evenly distributed throughout the liquid, but over time, they settle at the bottom of the bottle due to gravity. This characteristic of nail polish makes it a suspension rather than a solution or emulsion, where the particles would dissolve or remain evenly dispersed, respectively.

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  • 49. 

    When a substance undergoes a ________, a new substance with different properties is created.

    • A.

      Physical

    • B.

      Primary

    • C.

      Static

    • D.

      Chemical

    Correct Answer
    D. Chemical
    Explanation
    When a substance undergoes a chemical change, it reacts with other substances or undergoes a transformation that results in the formation of a new substance with different properties. This change is often accompanied by the release or absorption of energy, such as heat or light. Unlike physical changes, which only affect the physical state or appearance of a substance, chemical changes involve the rearrangement of atoms and the formation of new chemical bonds.

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  • 50. 

    The simplest form of chemical matter is a(n)?

    • A.

      Atom

    • B.

      Cell

    • C.

      Element

    • D.

      Neutron

    Correct Answer
    C. Element
    Explanation
    An element is the simplest form of chemical matter because it consists of only one type of atom. Atoms combine to form molecules and compounds, but an element cannot be broken down into simpler substances by chemical means. It is the fundamental building block of matter and is represented by a unique symbol on the periodic table. Cells are the basic structural and functional units of living organisms, while neutrons are subatomic particles found in the nucleus of an atom. Therefore, the correct answer is element.

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