Unit 9 - Acids, Bases, And Salts Test
In chemistry, if a substance’s pH is between 0 and 7, it is acidic. If it is between 7 and 14, it is a base. If it is 7, it is neutral. What else do you know about these substances?
Questions and Answers
- 1.
In a titration, the point where the indicator changes color and stays that way is the _______.
- A.
PH point
- B.
Endpoint
- C.
Acid point
- D.
Standard point
Correct Answer
B. EndpointExplanation
The endpoint in a titration refers to the point at which the indicator changes color and remains that way. This indicates that the reaction between the analyte and titrant is complete and the desired stoichiometric equivalence has been achieved. It is an important point to determine the amount of titrant needed to reach the endpoint, which helps in calculating the concentration of the analyte.Rate this question:
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- 2.
In a titration, the solution for which the concentration is known is called the _____.
- A.
Indicator
- B.
Hydrate
- C.
Normal solution
- D.
Standard solution
Correct Answer
D. Standard solutionExplanation
In a titration, the solution for which the concentration is known is called the standard solution. This solution is prepared with a precisely known concentration of a substance and is used to determine the concentration of another substance in the unknown solution. The standard solution acts as a reference point and is carefully measured and prepared to ensure accuracy in the titration process.Rate this question:
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- 3.
H3O+ units are called ____.
- A.
Hydroxide ions
- B.
Hydronium ions
- C.
Hydroxyl groups
- D.
Hydrogen ions
Correct Answer
B. Hydronium ionsExplanation
H3O+ units are called hydronium ions because they consist of a water molecule (H2O) with an additional hydrogen ion (H+). The positive charge of the hydrogen ion is balanced by the negative charge of the oxygen atom in the water molecule, resulting in the formation of a hydronium ion. This formation occurs when an acid donates a proton (H+) to a water molecule.Rate this question:
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- 4.
In an equation describing the ionization of an acid, double arrows pointing in opposite directions indicate the acid is _____.
- A.
Negative
- B.
Strong
- C.
Neutral
- D.
Weak
Correct Answer
C. NeutralExplanation
In an equation describing the ionization of an acid, double arrows pointing in opposite directions indicate that the acid is neutral. This means that the acid is not fully ionized, and there is an equilibrium between the ionized and non-ionized forms of the acid. The double arrows indicate that the reaction can occur in both directions, with some acid molecules ionizing and some ionized molecules recombining to form the original acid.Rate this question:
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- 5.
Our blood contains ______, which allow small amounts of acids or bases to be absorbed without harmful effects.
- A.
Salts
- B.
Esters
- C.
Buffers
- D.
Indicators
Correct Answer
C. BuffersExplanation
Buffers are substances that help maintain the pH balance of a solution by resisting changes in acidity or alkalinity. In the context of the question, buffers in our blood play a crucial role in maintaining a stable pH level. They can absorb and neutralize small amounts of acids or bases, preventing harmful effects on the body. Therefore, the presence of buffers in our blood allows for the absorption of small amounts of acids or bases without causing harm.Rate this question:
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- 6.
A compound formed in solution from the negative ion of an acid and the positive ion of a base is a _____.
- A.
Salt
- B.
Soap
- C.
Glycerin
- D.
Detergent
Correct Answer
A. SaltExplanation
In chemistry, when the negative ion of an acid combines with the positive ion of a base, it forms a compound known as a salt. Salts are formed through a process called neutralization, where the acidic and basic properties cancel each other out. This reaction results in the formation of a new compound with different properties than the acid and base individually. Therefore, the correct answer is salt.Rate this question:
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- 7.
Which of the following substances will react to form an ester?
- A.
Ethyl alcohol and sodium hydroxide
- B.
Acetic acid and sodium chlorate
- C.
Sodium chloride and ethyl alcohol
- D.
Acetic acid and ethyl alcohol
Correct Answer
D. Acetic acid and ethyl alcoholExplanation
Acetic acid and ethyl alcohol will react to form an ester. This is because esterification occurs when an alcohol reacts with an acid in the presence of an acid catalyst. In this case, ethyl alcohol (the alcohol) reacts with acetic acid (the acid) to form ethyl acetate, which is an ester. The reaction involves the condensation of the hydroxyl group (-OH) of the alcohol and the carboxyl group (-COOH) of the acid, resulting in the formation of an ester linkage (-COO-).Rate this question:
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- 8.
Which of the following is NOT a characteristic shared by soaps and detergents?
- A.
Has long carbons and chains
- B.
Reacts with minerals to form insoluble substances often called scum
- C.
May be classified as an organic salt
- D.
Is used for cleaning
Correct Answer
B. Reacts with minerals to form insoluble substances often called scumExplanation
Soaps and detergents are both used for cleaning and may be classified as organic salts. They also have long carbons and chains. However, the statement "reacts with minerals to form insoluble substances often called scum" is not a characteristic shared by both soaps and detergents. This statement suggests that one of the main differences between soaps and detergents is their reaction with minerals, where soaps tend to form scum while detergents do not.Rate this question:
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- 9.
Which of the following is the best indicator of the number of hydronium ions in a solution?
- A.
The pH of the solution
- B.
The mass of the solution
- C.
The color of the solution in the presence of an indicator
- D.
The amount of water in the solution
Correct Answer
A. The pH of the solutionExplanation
The pH of a solution is a measure of the concentration of hydronium ions (H3O+) in the solution. A low pH indicates a high concentration of hydronium ions, while a high pH indicates a low concentration of hydronium ions. Therefore, the pH of the solution is the best indicator of the number of hydronium ions present. The other options, such as the mass of the solution, the color in the presence of an indicator, and the amount of water, do not provide direct information about the concentration of hydronium ions.Rate this question:
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- 10.
Antacids work because they ______ excess stomach acid.
- A.
Neutralize
- B.
Contain
- C.
Acidify
- D.
Titrate
Correct Answer
A. NeutralizeExplanation
Antacids work by neutralizing excess stomach acid. When there is an overproduction of stomach acid, antacids, which are basic in nature, react with the acid to form water and a salt. This reaction helps to balance the pH level in the stomach, reducing the acidity and providing relief from symptoms such as heartburn and indigestion. Therefore, the correct answer is "neutralize".Rate this question:
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- 11.
A solution with a bitter taste and slippery feel is most likely _____.
- A.
An acid
- B.
A base
- C.
Salt
- D.
An ester
Correct Answer
B. A baseExplanation
A solution with a bitter taste and slippery feel is most likely a base. Bases are substances that release hydroxide ions (OH-) when dissolved in water. The presence of OH- ions in a solution can give it a bitter taste and a slippery feel. Acids, on the other hand, typically have a sour taste and do not feel slippery. Salts and esters do not exhibit these characteristics. Therefore, the most reasonable explanation for a solution with a bitter taste and slippery feel is that it is a base.Rate this question:
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- 12.
HCl is the formula for ____.
- A.
The hydronium ion
- B.
Hydrochloric acid
- C.
Hydrogen peroxide
- D.
Sodium hydroxide
Correct Answer
B. Hydrochloric acidExplanation
HCl is the formula for hydrochloric acid. Hydrochloric acid is a strong acid that is commonly used in laboratories and industries. It is a corrosive, colorless liquid that has a strong, pungent smell. It is formed by combining hydrogen chloride (HCl) with water (H2O). Hydrochloric acid is used in various applications such as cleaning, metal processing, and as a laboratory reagent. It is also found naturally in the stomach, where it helps in the digestion of food.Rate this question:
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- 13.
When you wash you hands with soap, you are using a(n) ______.
- A.
Buffer
- B.
Acid
- C.
Base
- D.
Indicator
Correct Answer
C. BaseExplanation
When you wash your hands with soap, you are using a base. Soap is typically made from a combination of fats and an alkali, which is a type of base. Bases have a higher pH level and can help to neutralize acids. Soap helps to remove dirt and oils from your hands by emulsifying them, allowing them to be washed away with water. Bases are also effective at killing bacteria and viruses, making them an important component of hand hygiene.Rate this question:
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- 14.
The terms dilute and concentrated refer to the ____ of a solution.
- A.
Concentration
- B.
Strength
- C.
PH
- D.
Acidity
Correct Answer
A. ConcentrationExplanation
The terms dilute and concentrated refer to the concentration of a solution. Concentration refers to the amount of solute present in a given amount of solvent or solution. A dilute solution has a low concentration of solute, meaning there is a small amount of solute dissolved in a larger amount of solvent. On the other hand, a concentrated solution has a high concentration of solute, meaning there is a large amount of solute dissolved in a smaller amount of solvent. Therefore, concentration is the correct answer.Rate this question:
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- 15.
The strength of a base that only partly ionizes in solution would be described as _____.
- A.
Dilute
- B.
Weak
- C.
Concentrated
- D.
Strong
Correct Answer
B. WeakExplanation
The strength of a base that only partly ionizes in solution would be described as weak. This means that the base does not completely dissociate into ions when dissolved in water. It only partially breaks apart, resulting in a lower concentration of ions in the solution. Weak bases have a lower ability to accept protons and therefore have a weaker alkaline effect compared to strong bases.Rate this question:
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- 16.
A reaction between an acid and a base that produces a salt and water is a(n) ______.
- A.
Neutralization
- B.
Synthesis
- C.
Decomposition
- D.
Endpoint
Correct Answer
A. NeutralizationExplanation
A reaction between an acid and a base that produces a salt and water is known as neutralization. In this type of reaction, the acidic and basic properties cancel each other out, resulting in a neutral product. The formation of a salt and water signifies the completion of the neutralization process.Rate this question:
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- 17.
A substance that produces H+ ions in solution is a(n) _____.
- A.
Acid
- B.
Base
Correct Answer
A. AcidExplanation
A substance that produces H+ ions in solution is called an acid. Acids are characterized by their ability to donate protons (H+) to other substances when dissolved in water. This donation of H+ ions results in an increase in the concentration of H+ ions in the solution, making it more acidic. Acids typically have a sour taste and can react with metals, carbonates, and bases. Examples of common acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and acetic acid (CH3COOH).Rate this question:
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- 18.
A substance that produces OH- ions in solution is a(n) ____.
- A.
Acid
- B.
Base
Correct Answer
B. BaseExplanation
A substance that produces OH- ions in solution is a base. Bases are substances that can accept protons or donate pairs of electrons. When a base dissolves in water, it releases hydroxide ions (OH-) into the solution. These hydroxide ions then react with hydrogen ions (H+) to form water. Therefore, the presence of OH- ions indicates the presence of a base.Rate this question:
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- 19.
Organic salts are similar to soaps are _____.
- A.
Detergents
- B.
Esters
- C.
Polyesters
Correct Answer
A. DetergentsExplanation
Organic salts are similar to soaps because they both have cleaning properties. They can both dissolve in water and remove dirt and grease from surfaces. Detergents, like soaps, are also surfactants, meaning they can lower the surface tension of water and help it spread more easily. This allows detergents to effectively clean a wide range of materials, making them a suitable answer in this context.Rate this question:
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- 20.
A(n) ____ is formed from an acid and an alcohol.
- A.
Detergent
- B.
Ester
- C.
Polyester
Correct Answer
B. EsterExplanation
An ester is formed from an acid and an alcohol. Esters are organic compounds that are commonly used as fragrances and flavors. They are formed through a reaction called esterification, where an acid and an alcohol combine to form an ester molecule. Esters have a wide range of applications in various industries, including the production of solvents, plastics, and pharmaceuticals.Rate this question:
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- 21.
These synthetic fibers, known as _______, consist of chains containing many esters.
- A.
Buffers
- B.
Polyesters
- C.
Detergents
Correct Answer
B. PolyestersExplanation
Polyesters are a type of synthetic fibers that are composed of chains containing many esters. Esters are organic compounds formed by the reaction between an acid and an alcohol. In the context of synthetic fibers, polyesters are commonly used due to their durability, wrinkle resistance, and ability to retain shape. They are widely used in the textile industry for making clothing, upholstery, and various other products.Rate this question:
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- 22.
Substances made when sodium or potassium hydroxide reacts with fatty acids are called ____.
- A.
Soaps
- B.
Detergents
- C.
Esters
Correct Answer
A. SoapsExplanation
When sodium or potassium hydroxide reacts with fatty acids, the resulting substances are called soaps. Soaps are formed through a process called saponification, where the hydroxide ions in the sodium or potassium hydroxide react with the fatty acids, breaking them down and forming soap molecules. Soaps are commonly used for cleaning and have the ability to remove dirt and oils from surfaces due to their unique molecular structure. Therefore, the correct answer is soaps.Rate this question:
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- 23.
___ is a measure of the hydronium ions in a solution.
- A.
PH
- B.
Neutralization
- C.
Titration
Correct Answer
A. PHExplanation
pH is a measure of the concentration of hydronium ions (H3O+) in a solution. It indicates the acidity or alkalinity of a solution on a scale of 0 to 14, with 7 being neutral. A lower pH value indicates a higher concentration of hydronium ions, making the solution more acidic, while a higher pH value indicates a lower concentration of hydronium ions, making the solution more alkaline. Therefore, pH is a measure of the hydronium ions in a solution.Rate this question:
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- 24.
A chemical reaction between an acid and a base is ______.
- A.
PH
- B.
Neutralization
- C.
Titration
Correct Answer
B. NeutralizationExplanation
Neutralization is the correct answer because it refers to the chemical reaction that occurs when an acid and a base react with each other, resulting in the formation of a salt and water. This reaction is characterized by the neutralization of the acidic and basic properties, leading to a pH close to 7.Rate this question:
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- 25.
The process in which a solution of known concentration is used to find the concentration of a second solution is called _____.
- A.
PH
- B.
Neutralization
- C.
Titration
Correct Answer
C. TitrationExplanation
Titration is the correct answer because it refers to the process of determining the concentration of a solution by reacting it with a solution of known concentration. During titration, a measured volume of the solution being analyzed is mixed with a solution of known concentration until the reaction between the two is complete. The point at which the reaction is complete is called the equivalence point, and it is used to calculate the concentration of the unknown solution.Rate this question:
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- 26.
Solutions with ions that reach with acids or bases to lesson their effects are _____.
- A.
Buffers
- B.
Hydronium ions
- C.
Salts
- D.
Indicator
Correct Answer
A. BuffersExplanation
Buffers are solutions that can resist changes in pH when small amounts of acid or base are added. They achieve this by containing a weak acid and its conjugate base or a weak base and its conjugate acid. When an acid is added to a buffer, it reacts with the weak base component of the buffer, and when a base is added, it reacts with the weak acid component. This reaction helps to maintain the pH of the solution relatively stable, thus lessening the effects of acids or bases.Rate this question:
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- 27.
A substance that changes color in an acid or a base is a(n) _____.
- A.
Buffer
- B.
Hydronium ion
- C.
Indicator
- D.
Salt
Correct Answer
C. IndicatorExplanation
An indicator is a substance that undergoes a color change when it is exposed to an acid or a base. It is used to determine the pH level of a solution by observing the color change. Indicators are commonly used in scientific experiments and in everyday applications such as litmus paper or pH strips.Rate this question:
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- 28.
A _____ base ionizes completely in solution
- A.
Strong
- B.
Weak
Correct Answer
A. StrongExplanation
A strong base is a type of substance that fully ionizes in a solution, meaning that it breaks apart completely into its constituent ions. This results in a high concentration of hydroxide ions (OH-) in the solution. In contrast, a weak base only partially ionizes, resulting in a lower concentration of hydroxide ions. Therefore, the correct answer is "strong" because it describes a base that undergoes complete ionization in solution.Rate this question:
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- 29.
A ____ base does not ionize completely in solution.
- A.
Weak
- B.
Strong
Correct Answer
A. WeakExplanation
A weak base is a substance that does not completely ionize in solution, meaning that only a fraction of the weak base molecules dissociate into their respective ions. This is in contrast to a strong base, which fully dissociates into ions when dissolved in solution. The incomplete ionization of a weak base is due to its limited ability to accept protons (H+) from water molecules.Rate this question:
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- 30.
An acid that almost completely ionizes in soltuion is a ___ acid.
- A.
Strong
- B.
Weak
Correct Answer
A. StrongExplanation
An acid that almost completely ionizes in solution is referred to as a strong acid. This means that when a strong acid is dissolved in water, it dissociates into ions to a large extent, resulting in a high concentration of ions in the solution. In contrast, a weak acid only partially ionizes in solution, resulting in a lower concentration of ions. Therefore, the correct answer is strong.Rate this question:
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- 31.
An acid that only partly ionizes in solution is a _____ acid.
- A.
Strong
- B.
Weak
Correct Answer
B. WeakExplanation
A weak acid is an acid that only partially ionizes in solution, meaning that it does not completely break apart into ions. This is in contrast to a strong acid, which fully ionizes in solution and completely dissociates into ions. Therefore, the correct answer is "weak" because it describes an acid that only partly ionizes in solution.Rate this question:
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