Combustion (A): fire, oxides and methane
Answers are for parents and teachers.
1
Name two ways to remove one side of the fire triangle in a kitchen, and say which side each removes.
For example, a lid removes oxygen; closing the gas valve removes fuel.
2
Write the equation for sodium burning in oxygen and name the oxide type.
4Na + O₂ → 2Na₂O; a basic oxide, because sodium is a metal.
3
How many oxygen molecules do 4 methane molecules need for complete combustion?
4 × 2 = 8 molecules of O₂.
4
A flame at the cooker is yellow. Say what it shows and what an adult should do.
Incomplete combustion; an adult should clean the burner or adjust the air and keep the room ventilated.
5
True or false: “soot is a kind of carbon monoxide.” Correct it.
False: soot is carbon; carbon monoxide is a toxic gas, CO.