Review: Interactions of Matter Unit

Front

What are the small numbers under and to the right of element symbols in a formula called?

Back

Subscripts

Front

Is boiling water a physical or chemical change?

Back

It is a physical change.

Front

Count the atoms for each element in KClO3: K = ?, Cl = ?, O = ?

Back

K = 1, Cl = 1, O = 3

Front

How do you determine the identity of an atom?

Back

By counting the number of protons.

Front

Is baking a cake a physical or chemical change?

Back

It is a chemical change.

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is the role of protons in an atom?

Back

Protons determine the identity of an atom and its element.

Front

What is the difference between a coefficient and a subscript in a chemical formula?

Back

A coefficient indicates the number of molecules, while a subscript indicates the number of atoms of an element in a molecule.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.