Balancing Equations Practice

Front

The red numbers in a chemical equation represent ________

Back

coefficients

Front

In chemical reactions, the principle of conservation of mass means that ________

Back

Matter is not created or destroyed.

Front

Is the following equation balanced or unbalanced? Al + O2 --> Al2O3

Back

Unbalanced

Front

The blue numbers in a chemical equation represent ________

Back

subscripts

Front

At the end of chemical reactions, the total mass of the reactants compared to the total mass of the products is ________

Back

the mass is the same.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules or atoms are involved in the reaction.

Front

What is a subscript in a chemical formula?

Back

A number written below and to the right of a chemical symbol indicating the number of atoms of that element in a molecule.

Front

What does it mean for a chemical equation to be balanced?

Back

The number of atoms of each element is the same on both sides of the equation.

Front

What is the first step in balancing a chemical equation?

Back

Count the number of atoms of each element on both sides of the equation.

Front

Why is it important to balance chemical equations?

Back

To obey the law of conservation of mass and accurately represent the reaction.