Mass changes when a reactant or product is a gas Flashcards
1
Q
Why might some reactions appear to involve a change in mass?
A
This is often because a reactant or product is a gas, and its mass hasn’t been considered.
2
Q
Provide an example of such a reaction involving a metal and oxygen.
A
When a metal reacts with oxygen, the mass of the oxide produced is greater than the mass of the metal.
3
Q
What happens in thermal decompositions of metal carbonates?
A
Carbon dioxide is produced and escapes into the atmosphere, leaving the metal oxide as the only solid product.
4
Q
What should students be able to do regarding changes in mass in non-enclosed systems during a chemical reaction?
A
Explain any observed changes using the balanced symbol equation and relate these changes to the particle model.
