T4 YR10 - Chemical calculations Flashcards
1
Q
Define the ‘law of conservation of mass’?
A
Total mass of reactants is equal to total mass of products
2
Q
What does ‘mole’ mean?
A
Set number of particles
3
Q
What is 1 mole equal too?
A
6X10 to 23 particles
4
Q
How do you calculate moles?
A
Mass divided by Mr
5
Q
Define conservation of mass?
A
In a chemical reaction where mass is neither created nor destroyed
6
Q
How do you calculate percentage mass?
A
Mass of substance in formula divided by total Mr X 100
7
Q
Define a concentration?
A
Measure of how much solute is dissolved in a solvent
8
Q
How do you calculate concentration?
A
Moles divided by volume
9
Q
How do you calculate mass?
A
Moles X Mr
10
Q
What should you always figure out in a reacting mass calculation?
A
Moles
