Chemistry Review

Front

What is the name of the number that appears on the left side of a chemical formula and represents how many compounds there are?

Back

The Coefficient

Front

What is the name of the number used to represent the number of each atom being represented in a chemical formula?

Back

The Subscript

Front

What is an example of a physical change?

Back

A mirror is broken, because there is a change in shape/size.

Front

What is the atomic number of oxygen?

Back

8

Front

What happens to the mass of water in a flask after boiling if the initial mass was 40 grams and the remaining mass is 25 grams?

Back

The water remaining after boiling has 25 grams of mass and the water vapor has 15 grams of mass.

Front

What is a chemical change?

Back

A process where one or more substances are transformed into new substances with different properties.

Front

Define a molecule.

Back

A molecule is a group of two or more atoms bonded together.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the definition of an atom?

Back

An atom is the smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What does the term 'mass' refer to in chemistry?

Back

Mass is a measure of the amount of matter in an object, typically measured in grams.