Balancing Chemical Equations

Front

What is the little number after an element in a chemical equation called?

Back

Subscript

Front

How many HCl molecules do you need to balance the equation: Mg + ___ HCl → MgCl2 + H2?

Back

2

Front

Balance the following equation: ___ H2 + ___ O2 → ___ H2O

Back

2, 1, 2

Front

In the equation, 2Mg + O2 → 2MgO, which are the reactants?

Back

Mg and O

Front

Balance the following equation: ___ Mg + ___ O2 → ___ MgO

Back

2, 1, 2

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a compound to indicate how many molecules are present.

Front

What does it mean to balance a chemical equation?

Back

To ensure that the number of atoms of each element is the same on both sides of the equation.

Front

What is the law of conservation of mass?

Back

Matter cannot be created or destroyed in a chemical reaction; the mass of reactants equals the mass of products.

Front

What is the purpose of balancing chemical equations?

Back

To accurately represent the quantities of reactants and products in a chemical reaction.

Front

What is the difference between reactants and products in a chemical equation?

Back

Reactants are substances that undergo a chemical change, while products are the substances formed as a result.