Unit 1 Midterm Review

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

Is water (H2O) an element or a compound?

Back

Water (H2O) is a compound.

Front

What is the difference between a mixture and a pure substance?

Back

A pure substance has a uniform and definite composition, while a mixture contains two or more substances that are not chemically combined.

Front

Is baking soda (NaHCO3) a pure substance or a mixture?

Back

Baking soda is a pure substance.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

Can compounds be broken down into simpler substances?

Back

Yes, compounds can be broken down into their constituent elements through chemical reactions.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

Give an example of a physical change.

Back

Melting ice is an example of a physical change.

Front

What is the definition of a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout.