Unit 3 lesson 2 (Chemical equations model chemical reactions)

Front

What is the Law of Conservation of Mass?

Back

It states that matter cannot be created or destroyed.

Front

What is a coefficient in a chemical equation?

Back

A numerical factor that indicates the relationship between the elements.

Front

True or false? The symbol in parentheses in a chemical formula indicates the charge of the element.

Back

False.

Front

What is the number before a chemical formula called? Example: 2H2 + O2 ---> 2H2O

Back

Coefficient.

Front

How many Mn atoms are found in the compound 2MnO4?

Back

2.

Front

What is a chemical equation?

Back

A representation of a chemical reaction using symbols and formulas.

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of an element in a molecule.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A substance that is formed as a result of a chemical reaction.