C2.3 Quantitive Chemistry Flashcards
1
Q
What’s an isotope?
A
Different number of neutrons
2
Q
What’s AR?
A
Mass compared to one carbon
3
Q
What’s empires formula?
A
Molecular formula in simplest form
4
Q
What’s % mass?
A
Mr/ total mass x 100
5
Q
How to work out empirical formula?
A
%/Ar
Divide by smallest
6
Q
What’s the equation with mass, mr and moles?
A
Moles= mass/ mr
7
Q
What’s an irreversible reaction?
A
Can’t go back
8
Q
What’s a reversible reaction and an example?
A
Can go back
Eg. Ammonium salts
Potassium dichromate to potassium chromate
9
Q
What’s % yield?
A
Actual yield/ theoretical yield x100
10
Q
What’s paper chromatography?
A
Ink goes up
11
Q
What’s gas and liquid chromatography?
A
Carrier gas moves gases Go through an oven Different speeds Detect when they leave Find mass Find what they are
12
Q
What’s a mole?
A
6.02 x 10^23 atoms
