Question 1

Which of the following is an example of a physical property?
Correct answer: Density of mercury

Accepted Answer

Density of mercury

Question 2

A student mixes sand and salt together in a beaker. Which classification best describes the resulting mixture?
Correct answer: Heterogeneous mixture

Accepted Answer

Heterogeneous mixture

Question 3

Which statement best describes the Law of Conservation of Mass?
Correct answer: The total mass of reactants equals the total mass of products in a chemical reaction.

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 4

Which of the following is a chemical property of hydrogen gas?
Correct answer: It reacts explosively with oxygen.

Accepted Answer

It reacts explosively with oxygen.

Question 5

A sample of water is heated and evaporates. Which of the following statements is true about this process?
Correct answer: It is a physical change because the chemical composition of water remains the same.

Accepted Answer

It is a physical change because the chemical composition of water remains the same.

Question 6

Which of the following best describes a pure substance?
Correct answer: A substance with uniform and definite composition

Accepted Answer

A substance with uniform and definite composition

Question 7

A chemist combines 10.0 g of substance A with 15.0 g of substance B in a closed container. After the reaction, 5.0 g of substance C and 20.0 g of substance D are produced. Which law does this observation support?
Correct answer: Law of Conservation of Mass

Accepted Answer

Law of Conservation of Mass

Question 8

Which of the following is NOT a physical property?
Correct answer: Ability to react with acid

Accepted Answer

Ability to react with acid

Question 9

Which scenario best illustrates a chemical change?
Correct answer: Iron forming rust when exposed to air

Accepted Answer

Iron forming rust when exposed to air

Question 10

A student observes that a clear liquid has a uniform composition throughout and cannot be separated by physical means. Which classification best fits this substance?
Correct answer: Pure substance

Accepted Answer

Pure substance

Question 11

Which of the following best distinguishes a compound from a mixture?
Correct answer: A compound consists of two or more elements chemically combined in a fixed ratio.

Accepted Answer

A compound consists of two or more elements chemically combined in a fixed ratio.

Question 12

A hospital stores oxygen gas in large tanks. Which property is most important for determining how much gas can be stored in a tank of fixed volume?
Correct answer: Density

Accepted Answer

Density

Question 13

Which of the following is an example of a homogeneous mixture?
Correct answer: Salt dissolved in water

Accepted Answer

Salt dissolved in water

Question 14

During a chemical reaction, 25 g of reactant A reacts with 15 g of reactant B to form 35 g of product C. What mass of another product, D, must be formed to satisfy the Law of Conservation of Mass?
Correct answer: 5 g

Accepted Answer

5 g

Question 15

Which of the following best describes the difference between a physical and a chemical property?
Correct answer: Chemical properties describe how a substance interacts with other substances.

Accepted Answer

Chemical properties describe how a substance interacts with other substances.

Question 16

A student claims that dissolving sugar in water is a chemical change. Which argument best refutes this claim?
Correct answer: The sugar and water can be separated by physical means.

Accepted Answer

The sugar and water can be separated by physical means.

Question 17

Which of the following is a correct statement about mixtures?
Correct answer: Mixtures can be separated into their components by physical means.

Accepted Answer

Mixtures can be separated into their components by physical means.

Question 18

A gold ring is analyzed and found to contain only gold atoms. How should this material be classified?
Correct answer: Element

Accepted Answer

Element

Question 19

Which of the following best explains why the mass of a closed system remains constant during a chemical reaction?
Correct answer: No atoms are lost or gained; they are simply rearranged.

Accepted Answer

No atoms are lost or gained; they are simply rearranged.

Question 20

A student heats a mixture of iron filings and sulfur. After heating, a new substance is formed that cannot be separated by physical means. What type of change has occurred?
Correct answer: Chemical change, because a new compound is formed.

Accepted Answer

Chemical change, because a new compound is formed.

Fundamental Concepts in Chemistry

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