Question 1

Which of the following best describes the Law of Conservation of Mass?

Accepted Answer

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

Question 2

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

Accepted Answer

Burning wood to produce ash and gases.

Question 3

A mixture of sand and salt can be separated by which physical process?

Accepted Answer

Filtration followed by evaporation

Question 4

Which of the following is a homogeneous mixture?

Accepted Answer

Saltwater

Question 5

Which property is a chemical property?

Accepted Answer

Ability to rust

Question 6

Which of the following is NOT evidence that a chemical change has occurred?

Accepted Answer

A solid melts

Question 7

Which of the following statements about elements and compounds is correct?

Accepted Answer

Compounds are made of two or more elements chemically combined.

Question 8

Which of the following best describes a molecule?

Accepted Answer

A group of atoms bonded together

Question 9

Which of the following is an example of a physical change?

Accepted Answer

Water boiling

Question 10

Which of the following best describes a crystalline solid?

Accepted Answer

A solid with particles arranged in a regular, repeating pattern

Question 11

Which of the following is a pure substance?

Accepted Answer

Distilled water

Question 12

Which of the following is a heterogeneous mixture?

Accepted Answer

Oil and water

Question 13

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 14

Which of the following best describes an amorphous solid?

Accepted Answer

A solid with no long-range order in its particles

Question 15

Which of the following is an example of a compound?

Accepted Answer

Water ($$H_2O)$$

Question 16

Which of the following is a correct statement about mixtures?

Accepted Answer

Mixtures have variable composition.

Question 17

Which of the following is NOT a state of matter?

Accepted Answer

Plasma (in the context of this course)

Question 18

Which of the following best describes a chemical reaction?

Accepted Answer

A process in which new substances with different properties are formed

Question 19

Which of the following is an example of separating a mixture by a physical change?

Accepted Answer

Distillation of alcohol and water

Question 20

Which of the following best describes a theory in chemistry?

Accepted Answer

A well-tested explanation for a broad set of observations

Fundamental Concepts in Chemistry: Matter, Properties, and Changes

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