Balancing/Word Equations Review

Front

What is a balanced equation?

Back

A balanced equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during a chemical reaction.

Front

How do you determine if a chemical equation is balanced?

Back

Count the number of atoms of each element on both sides of the equation. If they are equal, the equation is balanced.

Front

What is the law of conservation of mass?

Back

The law states that mass cannot be created or destroyed in a chemical reaction; it can only change forms.

Front

What does the coefficient in a chemical equation represent?

Back

The coefficient indicates the number of molecules or moles of a substance involved in the reaction.

Front

How many oxygen atoms are in 2 H2O?

Back

There are 2 oxygen atoms in 2 H2O.

Front

What is the total number of atoms in the compound NH3?

Back

There are 4 atoms in NH3 (1 nitrogen and 3 hydrogen).

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule.

Front

How many hydrogen atoms are in 4 H2O?

Back

There are 8 hydrogen atoms in 4 H2O.

Front

Is the equation 2 LiBr + Cl2 --> 2 Br2 + LiCl balanced?

Back

No, the equation is not balanced.

Front

What is the balanced equation for the combustion of methane (CH4)?

Back

The balanced equation is CH4 + 2 O2 --> CO2 + 2 H2O.