Chemistry Exam Practice Quiz
(147).webp "Chemistry Exam Practice Quiz - Quiz")
This is a pratice quiz for my exam. This is for chemistry exam.
Questions and Answers
- 1.
Main block elements form bonds by rearranging electrons so that each atom has a stable octet in its outermost energy level.
- A.
Ionic bond
- B.
Octet energy level
- C.
Empirical formula
- D.
Octet rule
Correct Answer
D. Octet ruleExplanation
The octet rule states that main block elements tend to form bonds by rearranging electrons in order to achieve a stable octet (8 electrons) in their outermost energy level. This means that atoms will gain, lose, or share electrons with other atoms to reach a total of 8 electrons in their valence shell. This rule helps explain the formation of various types of chemical bonds, including ionic bonds, where electrons are transferred from one atom to another to achieve stability.Rate this question:
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- 2.
A charged particle formed when an atoms loses or gains one or more electrons to form a stable outer shell.
- A.
Ion
- B.
Cation
- C.
Ation
- D.
Ionic bond
Correct Answer
A. IonExplanation
An ion is a charged particle that is formed when an atom gains or loses one or more electrons. This process occurs in order for the atom to achieve a stable outer electron shell. Therefore, the given statement accurately describes an ion.Rate this question:
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- 3.
The particle formed when an acid has donated a H+ ion
- A.
Base
- B.
Conjugate base
- C.
Acid
- D.
Conjugate acid
Correct Answer
D. Conjugate acidExplanation
When an acid donates a hydrogen ion (H+), it forms a particle known as the conjugate acid. This is because the acid loses a hydrogen ion and becomes a conjugate base. The conjugate acid is formed by the acceptance of the donated hydrogen ion, resulting in the formation of a new particle with a positive charge. Therefore, the correct answer is conjugate acid.Rate this question:
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- 4.
A reaction between a acid and base in which H+ and OH- react to form H20 acid + base à salt + water
- A.
Titration
- B.
Conjugate acid
- C.
Equivalence point
- D.
Neutralization reaction
Correct Answer
D. Neutralization reactionExplanation
A neutralization reaction is a type of reaction between an acid and a base in which the H+ ions from the acid and the OH- ions from the base combine to form water (H2O). This reaction also produces a salt as a byproduct. The process of determining the equivalence point in a neutralization reaction is called titration. In this process, a solution of known concentration (titrant) is added to a solution of unknown concentration (analyte) until the reaction reaches the equivalence point, where the acid and base have completely reacted. The conjugate acid is the species formed when a base accepts a proton (H+) from an acid.Rate this question:
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- 5.
(equivalence point) a point in a titration indicated by the color change of an indicator
- A.
Endpoint
- B.
Midpoint
- C.
Equivalence
- D.
Titration point
Correct Answer
A. EndpointExplanation
The term "endpoint" refers to a point in a titration where the color change of an indicator signals the completion of the reaction between the analyte and the titrant. This is different from the equivalence point, which is the theoretical point in the reaction where the stoichiometrically equivalent amounts of analyte and titrant have reacted. The endpoint may not always coincide exactly with the equivalence point, but it is used as a practical indicator to determine the endpoint of the reaction.Rate this question:
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- 6.
The bond formed by the attraction of oppositely charged ions (cations- metals and anions – nonmetals) is called _________.
- A.
Cation bond
- B.
Ionic bond
- C.
Covalent bond
- D.
Ionic
Correct Answer
B. Ionic bondExplanation
An ionic bond is formed by the attraction between oppositely charged ions, specifically cations (metals) and anions (nonmetals). This type of bond occurs when one atom transfers electrons to another, resulting in a positive and negative ion that are attracted to each other.Rate this question:
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- 7.
Simplest whole number ratio of atoms that matches the relative ratio of atoms found in a chemical compound.
- A.
Empirical formula
- B.
Single bond
- C.
VSPER theory
- D.
Chemical reaction
Correct Answer
A. Empirical formulaExplanation
The empirical formula is the simplest whole number ratio of atoms that matches the relative ratio of atoms found in a chemical compound. It represents the basic composition of the compound and does not necessarily indicate the actual number of atoms present.Rate this question:
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- 8.
Bond formed when atoms share pairs of electrons to achieve stability, often filling their outmost energy levels so that they will have a stable octet.
- A.
Sharedpair
- B.
Ionic bond
- C.
Covalent bond
- D.
Octet
Correct Answer
C. Covalent bondExplanation
A covalent bond is formed when atoms share pairs of electrons to achieve stability. This type of bond is often formed between nonmetal atoms. By sharing electrons, the atoms are able to fill their outermost energy levels, resulting in a stable octet. Covalent bonds are characterized by the sharing of electrons rather than the transfer of electrons, which is seen in ionic bonds.Rate this question:
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- 9.
Theory of Ionization. In an aqueous solution both molecular and ionic compounds can break apart and form ions Acids and release H+ into water bases release OH- into water
- A.
Bronsted-lowry theory
- B.
Conjugate acids
- C.
Svante arrehenius discovery
- D.
Base
Correct Answer
C. Svante arrehenius discoveryExplanation
Svante Arrhenius made the discovery that both molecular and ionic compounds can break apart and form ions in an aqueous solution. This discovery led to the development of the theory of ionization, which explains how acids release H+ ions into water and bases release OH- ions into water. Therefore, Svante Arrhenius' discovery is relevant to the given information about the theory of ionization and the behavior of acids and bases in aqueous solutions.Rate this question:
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- 10.
the particle formed when a base that accepted a H+ ion
- A.
Acid
- B.
Base
- C.
Conjuage base
- D.
Ph scale
Correct Answer
C. Conjuage baseExplanation
A conjugate base is formed when a base accepts a hydrogen ion (H+). In an acid-base reaction, the base accepts the H+ ion from the acid, resulting in the formation of its conjugate base. The conjugate base has one less H+ ion compared to the original base. Therefore, the correct answer is conjugate base.Rate this question:
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- 11.
PH scale
- A.
Conjuage acid
- B.
Base scale
- C.
Logarithmic scale
- D.
None
Correct Answer
C. Logarithmic scaleExplanation
The correct answer is "Logarithmic scale." The pH scale is a logarithmic scale that measures the acidity or alkalinity of a solution. It ranges from 0 to 14, with 7 being neutral. Each unit on the scale represents a tenfold difference in acidity or alkalinity. For example, a solution with a pH of 3 is ten times more acidic than a solution with a pH of 4. This logarithmic scale allows for a more precise measurement of the concentration of hydrogen ions in a solution.Rate this question:
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- 12.
Derived from the ideal gas law P1 V1/ T1 = P2 V2 / T2
- A.
Ideal gas law
- B.
Boyle's law
- C.
Partial pressure
- D.
Combined gas law
Correct Answer
D. Combined gas lawExplanation
The combined gas law is the appropriate answer because it combines Boyle's law (which relates pressure and volume) with Charles' law (which relates volume and temperature) and Gay-Lussac's law (which relates pressure and temperature). The formula P1V1/T1 = P2V2/T2 is derived from the combined gas law, making it the correct choice.Rate this question:
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- 13.
Units for Pressure
- A.
Ph, atm, torr
- B.
Ml,torr,atm,m3
- C.
Kpa,mmhg,stm,torr
- D.
Kpa,mmhg,atm,torr
Correct Answer
D. Kpa,mmhg,atm,torrExplanation
The correct answer is kpa, mmhg, atm, torr. These units are commonly used to measure pressure. Kpa stands for kilopascal, which is a unit of pressure in the metric system. Mmhg stands for millimeters of mercury, which is a unit commonly used in measuring atmospheric pressure. Atm stands for atmosphere, which is a unit of pressure equal to the average atmospheric pressure at sea level. Torr is another unit of pressure, equal to 1/760th of an atmosphere.Rate this question:
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- 14.
The two proportionality constant for ideal gas law equation is…
- A.
0.827 atm/ 74.6 l
- B.
0.0821 Latm/ 62.4 Ltorrmol k
- C.
1.3456 Latm/ 76.5 mol
- D.
0.0812 L atm/ 64.2 Ltorrmol k
Correct Answer
B. 0.0821 Latm/ 62.4 Ltorrmol kExplanation
The correct answer is 0.0821 Latm/ 62.4 Ltorrmol k. This is because the ideal gas law equation, PV = nRT, relates the pressure (P) and volume (V) of a gas to the number of moles (n), the gas constant (R), and the temperature (T) in Kelvin. The units of the gas constant must be consistent with the units of pressure, volume, moles, and temperature in the equation. In this case, the units of the gas constant are Latm/ Ltorrmol k, which are the correct units for the given equation.Rate this question:
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- 15.
Material dissolved in a solution
- A.
Solute
- B.
Solution
- C.
Souble
- D.
Slovent
Correct Answer
A. SoluteExplanation
The correct answer is "solute." In a solution, the solute is the material that is dissolved. It is the substance that is present in a smaller amount and is being dissolved by the solvent. In this case, the solute is the material that is being dissolved in the solution.Rate this question:
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- 16.
Material dissolving the solute to make the solution present in a larger amount. WATER!
- A.
Sloute
- B.
Solute
- C.
Solvent
- D.
Soublibilty
Correct Answer
C. SolventExplanation
The correct answer is solvent because a solvent is a material that dissolves the solute to create a solution. In this case, water is mentioned as the solvent since it is the material dissolving the solute. The solute is the substance being dissolved, and in this case, it is not specified. Solubility refers to the ability of a substance to dissolve in a solvent, but it is not the correct answer in this context.Rate this question:
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- 17.
Any ion with a positive charge.
- A.
Anion
- B.
Proton
- C.
Cation
- D.
Neutron
Correct Answer
C. CationExplanation
A cation is an ion with a positive charge. It is formed when an atom loses one or more electrons. The loss of electrons creates an imbalance between the positively charged protons and the negatively charged electrons, resulting in a net positive charge. Cations are attracted to anions, which are ions with a negative charge, and they play important roles in chemical reactions and the formation of compounds.Rate this question:
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- 18.
Four properties of salts
- A.
Melt easily, hard, low boling points, brittle
- B.
Brittle, high boiling points, hard, doesnt melt easily
- C.
Rough, hard, high boiling point, doesnt melt easily
- D.
Salty, sour, bitter, rough
Correct Answer
B. Brittle, high boiling points, hard, doesnt melt easilyExplanation
The answer is "brittle, high boiling points, hard, doesn't melt easily". Salts are known for their brittle nature, meaning they break easily when subjected to stress. They also have high boiling points, which means they require a lot of heat to change from a solid to a liquid state. Salts are generally hard substances, and they do not easily melt, meaning they have a high melting point.Rate this question:
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- 19.
If the amount of solute is less than the solubility limited at a given temperature
- A.
Saturated
- B.
Insouble
- C.
Solute
- D.
Unsaturated
Correct Answer
D. UnsaturatedExplanation
If the amount of solute is less than the solubility limit at a given temperature, it means that more solute can still be dissolved in the solvent. This indicates that the solution is not saturated. Therefore, the correct answer is unsaturated.Rate this question:
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- 20.
Concentrated unit, expressed as moles of solute per liter of solution M = mole solute/ liters of solution
- A.
Molarity formula
- B.
Partial pressure
- C.
Moles formula
- D.
Liters solution
Correct Answer
A. Molarity formulaExplanation
The molarity formula is used to calculate the concentration of a solution in moles of solute per liter of solution. It is expressed as M = mole solute/ liters of solution. This formula allows us to determine the amount of solute present in a given volume of solution, which is important in many chemical calculations and experiments.Rate this question:
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- 21.
A dissolved amount of solute that exceeds the normal solubility limit
- A.
Saturated
- B.
Super saturated
- C.
Solube
- D.
Unsaturated
- E.
Constant
Correct Answer
B. Super saturatedExplanation
A super saturated solution is formed when a dissolved amount of solute exceeds the normal solubility limit at a given temperature. This can occur by increasing the temperature or by adding more solute to a saturated solution. In a super saturated solution, the excess solute remains dissolved even though it would normally precipitate out. This state is unstable and the excess solute can easily crystallize out if disturbed or if a seed crystal is added.Rate this question:
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- 22.
Any base that dissociates completely
- A.
Weak base
- B.
Base
- C.
Strong base
- D.
Strong acid
Correct Answer
C. Strong baseExplanation
A strong base is a substance that completely dissociates in water, releasing hydroxide ions (OH-) into the solution. This means that all the molecules of a strong base break apart and produce hydroxide ions. Examples of strong bases include sodium hydroxide (NaOH) and potassium hydroxide (KOH). In contrast, a weak base only partially dissociates in water, meaning that only a fraction of its molecules release hydroxide ions. Therefore, the given correct answer is strong base.Rate this question:
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- 23.
Bronsted acids are H+ donors and Bronsted bases are H+ acceptors. Example NH3 + H2O
- A.
Bronsted law
- B.
Bronsted base law
- C.
Lowry law
- D.
Bronsted-lowry
Correct Answer
D. Bronsted-lowryExplanation
The given answer, "bronsted-lowry," is the correct answer because it accurately describes the concept being discussed. The Bronsted-Lowry theory states that acids are substances that donate protons (H+ ions) and bases are substances that accept protons. In the example provided, NH3 acts as a base by accepting a proton from H2O, which acts as an acid. Therefore, the Bronsted-Lowry theory is the most appropriate explanation for the given information.Rate this question:
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- 24.
What principle explains why indicators change colors?
- A.
Ph scale
- B.
Indicator
- C.
Le chatelius principle
- D.
Le cruz principle
Correct Answer
C. Le chatelius principle -
- 25.
Reached when PH is 7. The point in a titration process where the moles of standard are stoichometrically equivalent to the moles of substance titrated.
- A.
Titration
- B.
Stoichometrical
- C.
Equivalence point
- D.
Mid point
Correct Answer
C. Equivalence pointExplanation
The equivalence point in a titration process is reached when the moles of the standard solution are stoichiometrically equivalent to the moles of the substance being titrated. This means that the reaction between the two substances is complete and all of the reactants have been consumed. In this case, the equivalence point is reached when the pH is 7, indicating that the reaction has reached its endpoint and the titration is complete.Rate this question:
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- 26.
This is a system for predicting molecular shape based on the idea that pairs of electrons orient themselves as a far apart as possible
- A.
VSPER theory
- B.
Law of Consevation Mass
- C.
Stoichiometry
- D.
Wayne theory
Correct Answer
A. VSPER theoryExplanation
The VSPER theory is a system used to predict the shape of molecules. It is based on the concept that pairs of electrons in the outermost shell of an atom tend to orient themselves as far apart from each other as possible. This theory helps in determining the molecular geometry, which is crucial in understanding the physical and chemical properties of molecules. The other options, such as the Law of Conservation of Mass, Stoichiometry, and Wayne theory, are unrelated to the concept of predicting molecular shape.Rate this question:
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- 27.
A reaction in which heat is a products
- A.
Exothermic reaction
- B.
Enothermic reaction
- C.
Chemical reaction
- D.
Reacants
Correct Answer
A. Exothermic reactionExplanation
An exothermic reaction is a type of chemical reaction in which heat is released as a product. This means that the reaction releases energy in the form of heat to its surroundings. In contrast, an endothermic reaction absorbs heat from its surroundings. Therefore, the correct answer is "Exothermic reaction" because it accurately describes a reaction in which heat is a product.Rate this question:
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- 28.
Any ion with a negative charge.
- A.
Cation
- B.
Anion
- C.
Ion
- D.
Neutron
Correct Answer
B. AnionExplanation
An anion is a type of ion that carries a negative charge. It is formed when an atom gains one or more electrons. In contrast, a cation is an ion with a positive charge, formed when an atom loses one or more electrons. An ion is a general term for any atom or molecule that has gained or lost electrons, resulting in a positive or negative charge. A neutron, on the other hand, is a subatomic particle that carries no charge. Therefore, the correct answer is anion.Rate this question:
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- 29.
The electron present in the outmost energy level of an atom is called ________ _________.
- A.
Valence electron
- B.
Colvanent electron
- C.
Electron
- D.
None
Correct Answer
A. Valence electronExplanation
The electron present in the outermost energy level of an atom is called a valence electron. Valence electrons are important because they determine the chemical properties of an element and are involved in chemical bonding.Rate this question:
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- 30.
A pair of electrons that is not involved in a covalent bonding, but instead belongs exclusively to one atom.
- A.
Unshared pair
- B.
Shared pair
- C.
Single pair
- D.
One pair
Correct Answer
A. Unshared pairExplanation
An unshared pair refers to a pair of electrons that are not involved in a covalent bond, meaning they are not shared between two atoms. Instead, these electrons belong exclusively to one atom. This term is used to describe electron pairs in molecules that have lone pairs or non-bonding pairs of electrons.Rate this question:
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- 31.
The sharing of one pair of electrons between two atoms.
- A.
Share pair
- B.
Single bond
- C.
Single pair
- D.
Double bond
Correct Answer
B. Single bondExplanation
A single bond is formed when two atoms share one pair of electrons. This type of bond is the simplest and most common type of chemical bond. In a single bond, the shared pair of electrons is located in the space between the two atoms, holding them together. This bond is relatively weak compared to double or triple bonds, but it still provides stability to the molecule.Rate this question:
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- 32.
A covalent bond formed by the sharing of two pairs of electrons between 2 atoms to satisfy the octet rule.
- A.
Double bond
- B.
Double
- C.
One bond
- D.
Two bond
Correct Answer
A. Double bondExplanation
A double bond is formed when two pairs of electrons are shared between two atoms. This type of covalent bond is necessary to satisfy the octet rule, which states that atoms tend to gain, lose, or share electrons in order to have a full outer electron shell with eight electrons. In a double bond, two pairs of electrons are shared, resulting in a stronger bond compared to a single bond where only one pair of electrons is shared.Rate this question:
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- 33.
(Chemical Change) the process by which one or more substances are changed into one or more different substances
- A.
Chemical reaction
- B.
Endothermic reaction
- C.
Chemcial difference
- D.
Substance reaction
Correct Answer
A. Chemical reactionExplanation
A chemical reaction refers to the process in which one or more substances undergo a transformation, resulting in the formation of one or more new substances with different chemical properties. This change involves the breaking and forming of chemical bonds. It is characterized by the rearrangement of atoms and the release or absorption of energy. This term accurately describes the concept of substances being changed into different substances, making it the correct answer.Rate this question:
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- 34.
What are the products and reactants? __ H2 + __ O2 à___ H20
- A.
H2 product H2O reacant
- B.
H2+O2 reacant H2O product
- C.
H2+ O2 product H2O reacant
- D.
O2 product H2O reacant
Correct Answer
B. H2+O2 reacant H2O productExplanation
The correct answer is "H2+O2 reacant H2O product." In this chemical equation, H2 and O2 are the reactants, meaning they are the substances that undergo a chemical reaction. H2O is the product, which is the substance formed as a result of the reaction between H2 and O2.Rate this question:
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- 35.
Reaction in which heat is a reactant
- A.
Exothermic reaction
- B.
Endothermic reaction
- C.
Reacants
- D.
Chemical reaction
Correct Answer
B. Endothermic reactionExplanation
An endothermic reaction is a type of chemical reaction that absorbs heat from its surroundings. In this reaction, heat is a reactant, meaning it is required for the reaction to occur. As the reaction proceeds, it absorbs energy in the form of heat, causing the surroundings to cool down. This is why endothermic reactions often feel cold to the touch.Rate this question:
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- 36.
What law are coefficients used to satisfy in a balanced chemical equation _____________?
- A.
Law of Mass
- B.
Law of Conservation of Mass
- C.
Law of Conversions
- D.
Law of coefficients
Correct Answer
B. Law of Conservation of MassExplanation
Coefficients are used in a balanced chemical equation to satisfy the Law of Conservation of Mass. This law states that mass is neither created nor destroyed during a chemical reaction, but is conserved. By adjusting the coefficients in a balanced equation, the number of atoms on both sides of the equation can be equal, ensuring that mass is conserved.Rate this question:
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- 37.
Mass and quantity relationships among reactants and products in a chemical reaction
- A.
Stoichiometry
- B.
Law of Conservation of Mass
Correct Answer
A. StoichiometryExplanation
Stoichiometry is the branch of chemistry that deals with the mass and quantity relationships among reactants and products in a chemical reaction. It allows us to determine the amount of each substance involved in a reaction based on the balanced chemical equation. The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction, and stoichiometry helps us calculate the exact amounts of reactants and products to ensure that this law is upheld. Therefore, stoichiometry is the correct answer in this context.Rate this question:
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- 38.
The reactant that is not completely used up in a chemical reaction
- A.
Excess reactant
- B.
Limited reacants
- C.
Complete reacants
Correct Answer
A. Excess reactantExplanation
In a chemical reaction, the excess reactant refers to the reactant that is present in a greater amount than required for the reaction to occur completely. This means that even after the reaction is complete, there will still be some amount of the excess reactant remaining. On the other hand, limited reactants are the reactants that are consumed completely during the reaction, meaning that there is no excess left. Complete reactants is not a term used in chemistry and does not have any specific meaning. Therefore, the correct answer is excess reactant.Rate this question:
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- 39.
A reactant that is used up first and this limits the amount of other reactants that can participate in a chemical reaction to make products
- A.
Limiting reactants
- B.
Excessive reacant
- C.
Limit product reacant
Correct Answer
A. Limiting reactantsExplanation
A limiting reactant is the reactant that is completely consumed first in a chemical reaction, thereby limiting the amount of other reactants that can participate in the reaction. This ultimately determines the maximum amount of product that can be formed. In other words, the limiting reactant sets the upper bound for the amount of product that can be obtained in a reaction.Rate this question:
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- 40.
Maximum # of grams of products that can be obtained based on the amount of limiting reactant given to the balanced chemical equation
- A.
Theoretical yield
- B.
Actual yield
- C.
Limiting yield
Correct Answer
A. Theoretical yieldExplanation
Theoretical yield refers to the maximum amount of product that can be obtained based on the amount of limiting reactant given in a balanced chemical equation. It is calculated by using stoichiometry and assuming that the reaction goes to completion without any side reactions or losses. The actual yield, on the other hand, is the amount of product actually obtained in a laboratory or real-life scenario. The limiting yield is not a commonly used term in chemistry and does not accurately describe the concept of maximum product yield based on the limiting reactant.Rate this question:
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- 41.
The amount of products we actually collect in the chemical reaction experimentally, it cannot be calculated. Always less than theoretical yield.
- A.
Limit yield
- B.
Actual yield
- C.
Theo yield
Correct Answer
B. Actual yieldExplanation
The actual yield refers to the amount of product that is obtained in a chemical reaction experimentally. It is the quantity that is actually collected and measured in the laboratory. The actual yield is often less than the theoretical yield, which is the maximum amount of product that could be obtained under ideal conditions. This difference between actual and theoretical yield is due to various factors such as incomplete reactions, side reactions, and losses during purification or transfer of the product. Therefore, the actual yield is always expected to be less than the theoretical yield.Rate this question:
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- 42.
The least abundant reactant is usually ______ expensive, is the limiting reactant
- A.
Less
- B.
More
- C.
Fewer
- D.
Many more
Correct Answer
B. MoreExplanation
The least abundant reactant is usually more expensive because it is present in smaller quantities compared to the other reactants. This limited availability makes it more costly to obtain or produce, resulting in a higher price. As a result, the least abundant reactant becomes the limiting reactant, as its scarcity restricts the amount of product that can be formed in a chemical reaction.Rate this question:
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- 43.
The most abundant reactant, is usually _____, is the excess reactant
- A.
Cheaper, less
- B.
More
- C.
Many
- D.
Cheaper
Correct Answer
A. Cheaper, lessExplanation
The most abundant reactant is usually the one that is cheaper and present in a smaller quantity compared to the other reactants. This means that it is the excess reactant, as there is more of it available than is needed for the reaction to occur.Rate this question:
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- 44.
Percentage yield is a way to describe reaction _________.
- A.
Efficiency
- B.
Many
- C.
Actual yield
- D.
Complete
Correct Answer
A. EfficiencyExplanation
Percentage yield is a way to describe the efficiency of a reaction. It represents the proportion of the theoretical yield that is actually obtained in the reaction. A high percentage yield indicates a high efficiency, meaning that a large amount of the desired product was obtained. On the other hand, a low percentage yield suggests a low efficiency, indicating that only a small amount of the desired product was obtained. Therefore, the correct answer is Efficiency.Rate this question:
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- 45.
Can the theoretical yield be obtained in an experiment?
- A.
Yes
- B.
No
Correct Answer
B. NoExplanation
The theoretical yield refers to the maximum amount of product that can be obtained in a chemical reaction based on stoichiometry calculations. In practice, it is often difficult to achieve the theoretical yield due to factors such as incomplete reactions, side reactions, loss of product during purification, and experimental limitations. Therefore, it is unlikely to obtain the theoretical yield in an experiment.Rate this question:
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- 46.
The actual yield of a chemical reaction is _____ than the theoretical yield
- A.
More than
- B.
Less than
- C.
Fewer than
- D.
Many
Correct Answer
B. Less thanExplanation
The actual yield of a chemical reaction is "less than" the theoretical yield because there are various factors that can cause a reaction to not proceed to completion. These factors include side reactions, incomplete conversions, and losses during purification or separation processes. Therefore, the actual amount of product obtained is typically lower than the amount predicted by stoichiometry calculations.Rate this question:
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- 47.
Can gases be compressed, expand to fill a container and have very low densities?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Gases can be compressed because their particles are far apart and have a lot of empty space between them. This allows the gas to be compressed into a smaller volume. Gases also have the ability to expand to fill a container because their particles are constantly moving and can spread out to occupy the available space. Lastly, gases have very low densities because their particles are spread out and have a low mass compared to the volume they occupy. Therefore, the statement is true.Rate this question:
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- 48.
What is the formula to convert °C to Kelvin?
- A.
273+C= K
- B.
276+C=K
- C.
372+C=K
- D.
273-C=K
Correct Answer
A. 273+C= KExplanation
The correct formula to convert Celsius to Kelvin is 273 + C = K. This formula is derived from the fact that the Kelvin scale starts at absolute zero, which is -273.15 degrees Celsius. By adding 273 to the Celsius temperature, we can obtain the equivalent temperature in Kelvin.Rate this question:
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- 49.
What is standard temperature and pressure?
- A.
1 atm Cdegree
- B.
1.0 atm C degree
- C.
2 atm K dgree
- D.
1 atm C dgree
Correct Answer
B. 1.0 atm C degreeExplanation
Standard temperature and pressure (STP) is a set of conditions used for measurement and comparison of gases. It is defined as 1.0 atm (atmosphere) of pressure and 0 degrees Celsius (C) of temperature. This specific combination of pressure and temperature is used as a reference point in various scientific calculations and experiments.Rate this question:
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- 50.
States that volume of gas that constant pressure in directly proportional to the pressure V1/T1 = V2/T2
- A.
Charles law
- B.
Dalton law
- C.
Boyle law
Correct Answer
A. Charles lawExplanation
Charles' Law states that the volume of a gas at constant pressure is directly proportional to its temperature. This can be mathematically represented as V1/T1 = V2/T2, where V1 and T1 are the initial volume and temperature, and V2 and T2 are the final volume and temperature. Therefore, the correct answer is Charles' Law.Rate this question:
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Jan 25, 2024Quiz Edited by
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May 20, 2010Quiz Created by
Wow123
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