Relative formula mass Flashcards
1
Q
What is an Atomic number?
A
Number of protons in an element
2
Q
What is a Mass number?
A
Total number of protons and neutrons
3
Q
What is the group number of Mg
A
Group 2
4
Q
What is the period number of Mg
A
Period 3
5
Q
What is the test of Oxygen?
A
Re-ignite glowing lit splint
6
Q
Formula for finding Relative formula mass of an element and a compound
A
For elements:
number of element * The atomic number
For compounds:
sum of all (number of elements in compound * the atomic number)
7
Q
Formula for finding percentage composition
A
%x = (number of atoms of element) * (atomic mass of element) / Formula mass of the compound
8
Q
Law of conservation of mass
A
Mass is neither created nor destroyed during chemical processes
9
Q
Find % of Al in Al2O3
A
227 + 316
= 102
102/100
= 52.9%
