1
Q
uncombined element
A
0
2
Q
combined oxygen (with different element)
A
-2
3
Q
combined hydrogen
A
+1
4
Q
simple ion
A
charge on ion
5
Q
combined fluorine
A
-1
6
Q
H in metal hydrides
A
- 1
e. g. NaH, CaH2
7
Q
O in peroxides
A
- 1
e. g. H2O2
8
Q
O bonded to F
A
+2
F2O
9
Q
what does loss of electrons mean
A
oxidation
10
Q
what does gain of electrons mean
A
reduction
11
Q
ON of H2
A
0 (any diatomic molecule is 0)
12
Q
ON of H in 3H2O
A
+1 (just look at individual element, not number before or after it)
A-Level Chemistry
flashcards
Decks in class (25)
# Cards
-
Organic Chemistry synthetic routes14
-
chapter 122
-
f32220
-
f32116
-
oxididation numbers12
-
ozone14
-
equations//reactions104
-
4 - Moles46
-
5 - acids28
-
6 - electronic structure21
-
7 - bonding and structure101
-
8 - alkanes95
-
9 - Alkenes69
-
10 - Enthalpy43
-
11 - alcohols43
-
12 - Haloalkanes17
-
13 - synthesis and analysis36
-
14 - rates and equilibrium44
-
15 - Periodicity22
-
16 - redox21
-
17 - Reactivity trends38
-
18 - Transition elements36
-
3 - Ions & Substances31
-
1 & 2 chem basics/equations10
-
transition colours10
