Cambridge Secondary (7-9). Stage 8. Science. Learner's Book - Unit 8: Chemical reactions - Question 70

In the reaction shown here, magnesium is heated. From time to time, the heat is directed at the ceramic wool. The ceramic wool has been soaked in water, which when heated produces steam. In this reaction the magnesium reacts with water, which is in the form of a gas. Magnesium oxide and hydrogen are formed. The hydrogen gas that is given off can be burnt.



Explain, using particle theory, why the reaction between steam and magnesium is more vigorous than between water and magnesium.