Question

The chemical equation below shows the combustion of propane.

C3H8 + O2 4H2O + 3 CO2
Use the chemical equation to complete the sentences by selecting a response from the drop-down menu.

1. The H20 is an example of a

2. The O2 is an example of a

3. The number 4 in front of H2O is an example of a

4. The number 8 in the
chemical formula C3H8 is an example of a

Answer 1

`\\ \sf\longmapsto C_3H_8+O_2\longrightarrow 4H_2O+3CO_2`

• H_2O is an example of molecule
• O_2 is also an molecule
• Number in front of H_2O means moles of H_2O molecule
• 8 in the chemical formula C3H_8 is atoms of H present