Chemistry Unit Test Review

Front

What happens during a chemical change?

Back

A chemical change occurs when a substance is changed at the atomic level, bonds are broken and formed, and a new substance is made.

Front

What is NOT a compound?

Back

Iodine is NOT a compound; it is an element.

Front

What is a characteristic of elements?

Back

Elements are made of only one type of atom.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that has a non-uniform composition, such as salad dressing.

Front

What best describes a compound?

Back

A compound is made of two or more elements chemically combined.

Front

What is the definition of a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded.

Front

What is the difference between a compound and a mixture?

Back

A compound is made of two or more elements chemically combined, while a mixture is a physical combination of substances.

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is salt water.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is an atom?

Back

An atom is the smallest unit of an element that retains the properties of that element.