Question 1

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

Accepted Answer

Boiling water to produce steam

Question 2

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

Accepted Answer

Filtration followed by evaporation

Question 3

Which statement best describes a pure substance?

Accepted Answer

It has a constant composition and a fixed set of properties.

Question 4

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 5

According to Dalton’s Atomic Theory, which statement is correct?

Accepted Answer

All atoms of a given element are identical in mass and properties.

Question 6

Which law states that in a chemical reaction, matter is neither created nor destroyed?

Accepted Answer

Law of Conservation of Mass

Question 7

A sample of sodium chloride (NaCl) is analyzed and found to contain 39.3% sodium and 60.7% chlorine by mass. What law does this observation illustrate?

Accepted Answer

Law of Definite Proportions

Question 8

Which of the following is NOT a physical property?

Accepted Answer

Ability to react with acid

Question 9

Which process involves a chemical change?

Accepted Answer

Combustion of methane

Question 10

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the components are not evenly distributed

Question 11

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

Accepted Answer

Compounds are composed of atoms of two or more elements chemically combined in fixed proportions.

Question 12

Which separation technique would be most effective for separating a homogeneous solution of salt water?

Accepted Answer

Evaporation

Question 13

Which of the following is a chemical property?

Accepted Answer

Ability to rust

Question 14

Which of the following is true about the Law of Definite Proportions?

Accepted Answer

A compound always contains the same elements in the same ratio by mass.

Question 15

Which of the following is an example of a solution that is NOT a liquid?

Accepted Answer

Air

Question 16

Which of the following best describes Dalton’s postulate about chemical reactions?

Accepted Answer

Atoms rearrange to form new chemical combinations.

Question 17

A student mixes copper sulfate and water. Which type of mixture is formed?

Accepted Answer

Homogeneous mixture (solution)

Question 18

Which of the following is NOT a postulate of Dalton’s Atomic Theory?

Accepted Answer

Atoms can be created or destroyed in chemical reactions.

Question 19

Which of the following best explains why boiling water is a physical change?

Accepted Answer

The state of water changes from liquid to gas, but the molecules remain H$$_2O.$$

Question 20

A mixture of iron filings and sulfur is heated strongly. Which statement best describes the result?

Accepted Answer

A chemical change occurs, forming iron sulfide, which cannot be separated by physical means.

CH 1 & 2: General Chemistry I: Properties of Matter, Mixtures, and Atomic Theory

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