7th Grade Physical Science Summative 1

Front

Molecules are two or more _____ bonded together.

Back

atoms

Front

What is being formed in this reaction?

Back

Gas

Front

What and how many atoms are in this molecule?

Back

1 oxygen, 2 hydrogen

Front

What is this picture an example of?

Back

Molecule

Front

Atoms are the ____________ of matter.

Back

basic building blocks

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.

Front

What is the difference between an atom and a molecule?

Back

An atom is a single unit, while a molecule is made up of two or more atoms.

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance.

Front

What is the law of conservation of mass?

Back

Matter cannot be created or destroyed in a chemical reaction.