Question 72
Magnesium is a silvery metal. When it burns in oxygen, it gives out a bright white light. The product of the reaction is a white powder, magnesium oxide.
How can you tell whether a chemical reaction has taken place?
Tick (✓) the two correct statements.
- The product has a greater mass than the reactants.
- The magnesium has melted.
- The solution changes colour.
- A precipitate is formed.
How can you tell whether a chemical reaction has taken place?
Tick (✓) the two correct statements.
- The product has a greater mass than the reactants.
- The magnesium has melted.
- The solution changes colour.
- A precipitate is formed.
