Unit 2 Practice Test: Changes in Matter (BAKER)

Front

What is the independent variable (IV) in an experiment?

Back

The independent variable (IV) is the factor that is changed or controlled in a scientific experiment to test its effects on the dependent variable.

Front

What is the law of conservation of matter?

Back

The law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What does it mean for a substance to freeze?

Back

Freezing is the process in which a liquid turns into a solid when its temperature is lowered.

Front

What is the average of a set of numbers?

Back

The average is the sum of all the numbers divided by the count of numbers in the set.

Front

How do you calculate the average of 5 cm, 5 cm, 6 cm, and 8 cm?

Back

(5 + 5 + 6 + 8) / 4 = 6 cm.

Front

What is the significance of temperature in the freezing process?

Back

Temperature affects the rate at which substances freeze; lower temperatures generally lead to faster freezing.

Front

What is carbon dioxide (CO2)?

Back

Carbon dioxide (CO2) is a colorless gas produced by burning carbon and organic compounds and by respiration.

Front

What is sodium chloride (NaCl)?

Back

Sodium chloride (NaCl) is a chemical compound commonly known as table salt.