Duelling Chemists

About this topic

Revise Formulae and Equations, including what does conservation of mass state for a closed chemical reaction, explaining why are chemical equations balanced, choosing which is the balanced equation for forming water and explaining how many oxygen atoms are in one formula unit of CaCO 3.

This topic covers

• what does conservation of mass state for a closed chemical reaction
• explaining why are chemical equations balanced
• choosing which is the balanced equation for forming water
• explaining how many oxygen atoms are in one formula unit of CaCO 3

Example question types

• answer a short question such as “What does conservation of mass state for a closed chemical reaction”
• answer a short question such as “Why are chemical equations balanced”
• answer a short question such as “Which is the balanced equation for forming water”