8.P.1 (Chemistry) Review

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into new substances (products) with different properties.

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What evidence indicates a chemical change has occurred?

Back

The formation of a new substance, such as a precipitate, gas, or temperature change.

Front

What happens to the motion of water molecules when they boil?

Back

They move faster and move farther apart as they absorb heat.

Front

What are noble gases?

Back

Elements in Group 18 of the periodic table that are nonreactive and include helium (He) and neon (Ne).

Front

Why is mass conserved in a chemical reaction?

Back

The total mass of reactants equals the total mass of products; mass cannot be created or destroyed.

Front

What is a mixture?

Back

A combination of two or more substances that retain their individual properties.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements chemically bond, while a mixture is a physical combination of substances.

Front

What happens to mass when wood is burned?

Back

Some mass is lost as gas, resulting in less ash than the original mass of wood.

Front

What is the primary component of air?

Back

Nitrogen, which makes up about 78% of the Earth's atmosphere.