Question 1

Which of the following best describes a chemical property?

Accepted Answer

Iron reacts with oxygen to form rust.

Question 2

A student mixes salt and water in a beaker. Which type of matter is formed?

Accepted Answer

Homogeneous mixture

Question 3

Which of the following is a physical change?

Accepted Answer

Dissolving sugar in water

Question 4

Which statement about the kinetic theory of matter is correct?

Accepted Answer

Particles in a liquid are closely packed but can slide past each other.

Question 5

Which of the following is NOT a chemical change?

Accepted Answer

Water freezing

Question 6

A sample contains sand and iron filings. Which method would best separate these substances?

Accepted Answer

Magnetism

Question 7

Which of the following is a compound?

Accepted Answer

Water ($$H_2O)$$

Question 8

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object, weight is the force of gravity acting on that mass.

Question 9

Which separation technique is most appropriate for separating a liquid from a solution based on boiling point differences?

Accepted Answer

Distillation

Question 10

Which of the following is a heterogeneous mixture?

Accepted Answer

Vegetable soup

Question 11

Which of the following is the correct chemical equation for the decomposition of water?

Accepted Answer

$$2H_2O(l) \rightarrow 2H_2(g) + O_2$(g)$$

Question 12

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

Accepted Answer

Compounds are made of two or more elements chemically combined.

Question 13

A student measures the mass of a sample as $$2.50\ kg. $$How many grams is this?

Accepted Answer

$$2500\ g$$

Question 14

Which of the following is a physical property?

Accepted Answer

Color

Question 15

Which of the following best describes a solid according to the kinetic theory of matter?

Accepted Answer

Particles are closely packed and vibrate in place.

Question 16

Which of the following is the correct definition of chemistry?

Accepted Answer

The study of matter and the changes it undergoes.

Question 17

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 18

Which of the following is NOT a method for separating mixtures?

Accepted Answer

Electrolysis

Question 19

Which of the following statements about physical and chemical changes is correct?

Accepted Answer

Chemical changes result in the formation of new substances.

Question 20

A mixture of sand and salt is added to water. Which process would best separate the salt from the sand?

Accepted Answer

Filtration followed by evaporation

Introduction to Chemistry: Matter, Properties, and Measurement

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