Question

Balance the equations by putting the necessary coefficients in the blanks. Normally we do not write 1s when balancing, but for this particular question you need to include them for full credit.

Answer 1

To balance the chemical equations, we need to make sure that the number of atoms of each element is the same on both sides of the equation. We can do this by adding coefficients in front of the chemical formulas. For example, in the equation Na3N → Na + N2, we need to add a coefficient of 3 in front of Na because there are 3 Na atoms on the left side of the equation but only 1 on the right side.

Here is a table of the balanced equations, including the coefficients:

| Chemical reaction | Balanced equation |

|---|---|---|

| Sodium azide decomposes to sodium and nitrogen. | 1 Na3N → 3 Na + 1 N2 |

| Phosphoric acid and potassium hydroxide react to form potassium phosphate and water. | 3 H3PO4 + 3 KOH → K3PO4 + 3 H2O |

| Nitrogen and hydrogen react to form ammonia. | 1 N2 + 3 H2 → 2 NH3 |

| Hydrogen peroxide decomposes to oxygen and water. | 2 H2O2 → 2 O2 + 2 H2O |

| Zinc reacts with hydrochloric acid to form zinc chloride and hydrogen. | Zn + 2 HCl → ZnCl2 + H2 |

| Ethane reacts with oxygen to form carbon dioxide and water. | 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O |

| Copper chloride reacts with hydrogen sulfide to form copper sulfide and hydrochloric acid. | CuCl2 + H2S → CuS + 2 HCl |