Paper 1: Conservation Of Mass Flashcards
What does the law of conservation of mass state?
The total mass of reactants stays constant during a chemical reaction
Total mass before and after a reaction stays the same
What is a closed system?
Where no substances can enter or leave during a reaction
What do close systems include?
Reactions in a sealed container
Precipitation reactions in a beaker
What is a Non-enclosed system?
Where substances can leave or enter during a reaction
What do non-enclosed systems include?
Reactions in an open flask
What happens to the mass in a closed system?
Stays the same
What happens to the mass in a non-enclosed system?
Mass of a reactive metal increases
Mass of a reactive non-metal decreases
Why does the mass of a reactive metal increases in a non-enclosed system?
Oxygen atoms combine with metal atoms to form metal oxides
Why does the mass of a reactive non-metal decrease in a non-enclosed system?
Products in the gas state escapes from the containers
