Write the balanced chemical equations and word equations for the reactions represented by the molecular models shown.

Here are the balanced chemical equations and word equations for the given reactions:

5.1

• The models represent:
  • Striped circle: Carbon (C)
  • Two large empty circles: Oxygen molecule ($\text{O}_2$)
  • One striped circle bonded to two large empty circles: Carbon dioxide ($\text{CO}_2$)

a) Balanced chemical equation:

$$\text{C} + \text{O}_2 \rightarrow \text{CO}_2$$

b) Word equation:

$$\text{Carbon} + \text{Oxygen} \rightarrow \text{Carbon dioxide}$$

5.2

• The models represent:
  • Two small dark circles: Hydrogen molecule ($\text{H}_2$)
  • Two large empty circles: Oxygen molecule ($\text{O}_2$)
  • One large empty circle bonded to two small dark circles: Water ($\text{H}_2\text{O}$)

a) Balanced chemical equation:

$$2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}$$

b) Word equation:

$$\text{Hydrogen} + \text{Oxygen} \rightarrow \text{Water}$$

Last Reaction (unlabeled, assuming 5.3)

• The models represent:
  • Large dotted circle: Magnesium (Mg)
  • Two large empty circles: Oxygen molecule ($\text{O}_2$)
  • One large dotted circle bonded to one large empty circle: Magnesium oxide (MgO)

a) Balanced chemical equation:

$$2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO}$$

b) Word equation:

$$\text{Magnesium} + \text{Oxygen} \rightarrow \text{Magnesium oxide}$$