Quantitative chemistry Flashcards
1
Q
What is the law of conservation of mass?
A
in chemical reactions, atoms cannot be created or destroyed, only bonds change. Mass of products = mass of reactants
2
Q
Why might the mass of reactants appear greater than products?
A
If a product is gas and it escapes the unsealed container
3
Q
What is the relative formula mass of a compound?
A
The sum of the atomic masses of each element
4
Q
How do we find the percentage of mass of an element for a compound?
A
Atomic mass of element/RFM
5
Q
What is a mole?
A
Units used to measure a chemical amount
6
Q
What is 1 mole equal to?
A
6.02 x 10^23 particles
7
Q
What is the formula for moles?
A
Mass/RFM (grams/rams)
8
Q
What is Avagadro’s constant?
A
6.02 x 10^23
9
Q
Define limiting reactant
A
the reactant that is used up whilst the other reactants are in excess
