Balancing Equations

Front

What does the principle of conservation of mass state?

Back

Matter is not created or destroyed in a chemical reaction.

Front

How do you balance the equation: __ Al + __ HCl → __ H2 + __ AlCl3?

Back

2 Al + 6 HCl → 3 H2 + 2 AlCl3

Front

What is the term for the small number written below an element in a chemical formula?

Back

Subscript

Front

How many hydrogen atoms are in 4H2O?

Back

8

Front

How many phosphorus atoms are in PO4?

Back

1

Front

What is a coefficient in a chemical equation?

Back

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

Front

What is the product in a chemical reaction?

Back

The substances formed as a result of a chemical reaction.

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 difference between a reactant and a product?

Back

Reactants are the starting substances in a chemical reaction, while products are the substances formed.

Front

What is the significance of the arrow in a chemical equation?

Back

It indicates the direction of the reaction, showing reactants transforming into products.