Write chemical equations from the given word equations: Magnesium + Oxygen à Magnesium Oxide Hydrogen + Oxygen à Water Methane + oxygen à Carbon dioxide + Water

1. 2Mg + O2 —> 2MgO

2. 2H2 + O2 —> 2H2O

3. CH4 + 2O2 —> CO2 + 2H2O

Explanation:

1. Magnesium + Oxygen —> Magnesium Oxide

Mg + O2 —> MgO

There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 2 in front of MgO as shown below:

Mg + O2 —> 2MgO

There are 2 atoms of Mg on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Mg as shown below:

2Mg + O2 —> 2MgO

Now the equation is balanced.

2. Hydrogen + Oxygen —> Water

H2 + O2 —> H2O

There are 2 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 2 in front of H2O as shown below:

H2 + O2 —> 2H2O

There are 2 atoms of H on the left side and a total of 4 atoms on the right side. It can be balance by putting 2 in front of H2 as shown below:

2H2 + O2 —> 2H2O

Now, the equation is balanced.

3. Methane + oxygen à Carbon dioxide + Water

CH4 + O2 —> CO2 + H2O

There are 4 atoms of H on the left side and 2 atoms on the right side. It can be balance by putting 2 in front of H2O as shown below:

CH4 + O2 —> CO2 + 2H2O

There are 2 atoms of O on the left side and a total of 4 atoms on the right side. It can be balance by putting 2 in front of O2 as shown below:

CH4 + 2O2 —> CO2 + 2H2O

Now, the equation is balanced.