Calculations Flashcards
1
Q
Relative formula mass
Example what does this mean?
Na3PO4.
A
This formula means there are 3 sodium
atoms present, 1 phosphorus and 4
oxygen.
r.f.m = (3 x 23) + (1 x 31) + (4 x 16)
r.f.m = 164
2
Q
Empirical Formula of Magnesium
Oxide
What do you use to lift the crucible?
A
Use tongs to lift, to avoid burns
3
Q
Why should you lift the lid?
A
Allows oxygen in
4
Q
How to ensure Mg is fully reacted
A
Reheat until no further change in mass
5
Q
Law of Conservation of Mass’
A
Atoms cannot be created or destroyed.
In a closed system the amount of mass
will remain constant over time.
