Chemistry Test 1 Review

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. It can be made up of the same or different elements.

Front

Which of the following is NOT a molecule? A) H2 B) O2 C) Na D) CO2

Back

D) Na is not a molecule; it is a single atom.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that is not uniform throughout, meaning its components can be easily distinguished.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that is uniform in composition, meaning its components are evenly distributed.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and properties throughout, such as elements and compounds.

Front

What is a diatomic molecule?

Back

A diatomic molecule is a molecule that consists of two atoms, which can be of the same or different elements.

Front

Give an example of a diatomic molecule.

Back

An example of a diatomic molecule is O2 (oxygen gas).

Front

What is density?

Back

Density is the mass of a substance divided by its volume, often expressed in g/mL or g/cm³.

Front

If a substance has a density less than 1 g/mL, will it sink or float in water?

Back

It will float in water.

Front

What happens to the density of an object if its mass increases while its volume remains the same?

Back

The density of the object increases.