Symbols, formulae and equations Flashcards
(12 cards)
1
Q
What is the valency of group 1,2,3,4,5,6,70
A
1,2,3,4,3,2,1,none
2
Q
Where is the valency of the elements on the back of the periodic table
A
the top number
e.g. valency = 2-
3
Q
what is the valency of iron (II) compounds
A
2
4
Q
what is the valency of iron (III) compounds
A
3
5
Q
what is the valency of copper (II) compounds
A
2
6
Q
what is the valency of cobalt (II) compounds
A
2
7
Q
what is the valency of silver (I) compounds
A
1
8
Q
PAST PAPER Q ON FORMULAE OF A COMPOUND
A
9
Q
why do equations have to be balanced
A
no atoms are lost or gained during a chemical reaction, just reorganised
10
Q
PAST PAPER Q ON IONIC EQUATIONS + HALF EQUATIONS
A
11
Q
what does a half equation involve
A
electrons
12
Q
A
