Level Chemistry Transition Unit Worksheet With Answer Key - Healthcote School Page 6
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1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
175
Relative masses
Task 4:
Element
A
Element
A
Element
A
r
r
r
aluminium
Al
27
hydrogen
H
1
phosphorus
P
31
bromine
Br
80
iodine
I
127
potassium
K
39
calcium
Ca
40
iron
Fe
56
silver
Ag
108
carbon
C
12
magnesium
Mg
24
sodium
Na
23
chlorine
Cl
35.5
nitrogen
N
14
sulfur
S
32
copper
Cu
63.5
oxygen
O
16
zinc
Zn
65
fluorine
F
19
1
2
a 58
a 55.2%
b 213
b 67.6%
c 400
c 48.0%
d 162
d 1.2%
e 132
e 21.2%
f 249.5
f 57.7%
g 286
g 16.1%
h 392
h 14.3%
Balancing equations
Task 5:
Balance the following equations.
a N
+ 3H
→ 2NH
2
2
3
b 2Ca + O
→ 2CaO
2
c Br
+2KI → 2KBr + I
2
2
d 3Fe + 4H
O → Fe
O
+ 4H
2
3
4
2
e C
H
+ 5O
→ 3CO
+ 4H
O
3
8
2
2
2
f 4NH
+ 5O
→ 4NO + 6H
O
3
2
2
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