TASK 1 – Writing formulas of ionic compounds
1
7
13
AgBr
Al(NO3)3
Ga(OH)3
2
8
14
Na2CO3
Na2SO4
SrSe
3
9
15
K2O
PbO
RaSO4
4
10
16
Fe2O3
Na3PO4
Na3N
5
11
CrCl3
Zn(HCO3)2
6
12
Ca(OH)2
(NH4)2SO4
3
9
15
Na
SiO2
Ni
4
10
16
NH4Cl
Si
H2S
5
11
17
NH3
Ba(OH)2
TiO2
6
12
18
S8
SnCl4
Pb
3
9
15
PtF2
V2O5
Si
4
10
16
HNO3
Co(OH)2
Ca3(PO4)2
5
11
17
NH3
Ca(OH)2
Rb
6
12
18
SiH4
NH4Cl
GeO2
TASK 2 – Writing formulas 1
1
7
13
19
PbO2
H2SO4
AgNO3
SrSO4
2
8
14
20
Cu
Ne
I2
Li
TASK 3 – Writing formulas 2
1
7
13
19
Ag2CO3
P4
HCl
MgAt2
2
8
14
20
Au
C
F2
Ar
TASK 4 – Writing balanced equations 1
1
2
a
Mg + 2 HNO3 → Mg(NO3)2 + H2
b
CuCl2 + 2 NaOH → Cu(OH)2 + 2 NaCl
c
2 SO2 + O2 → 2 SO3
d
C4H10 + 6½ O2 → 4 CO2 + 5 H2O or 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O
a
4 Na + O2 → 2 Na2O
b
2 Al + 3 Cl2 → 2 AlCl3
c
Ca + 2 HCl → CaCl2 + H2
d
2 NH3 + H2SO4 → (NH4)2SO4
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07-Jul-12
Chemsheets AS 008
1
TASK 5 – Writing balanced equations 2
1
4 Al + 3 O2 → 2 Al2O3
2
C6H14 + 9½ O2 → 6 CO2 + 7 H2O
or
2 C6H14 + 19 O2 → 12 CO2 + 14 H2O
3
CH3CH2SH + 4½ O2 → 2 CO2 + SO2 + 3 H2O or 2 CH3CH2SH + 9 O2 → 4 CO2 + 2 SO2 + 6 H2O
4
2 Li + 2 H2O → 2 LiOH + H2
5
CaCO3 + 2 HNO3 → Ca(NO3)2 + H2O + CO2
6
Li2CO3 → Li2O + CO2
7
NH3 + HNO3 → NH4NO3
8
K2O + H2SO4 → K2SO4 + H2O
9
Ca(OH)2 + 2 HCl → CaCl2 + 2 H2O
10
3 Zn + 2 H3PO4 → Zn3(PO4)2 + 3 H2
11
2 NaHCO3 + H2SO4 → Na2SO4 + H2O + CO2
12
2 KOH + H2SO4 → K2SO4 + 2 H2O
TASK 6 – Ionic equations
1
HCl, LiOH, 1:1; H2SO4, NaHCO3, 1:2; HNO3, NH3, 1:1; H2SO4, K2CO3, 1:1, HNO3, Sr(OH)2, 2:1
2
a
H + OH → H2O
b
Ag + I → AgI
+
-
+
-
+
2-
c
2 H + CO3 → H2O + CO2
d
Ca
2+
-
+ 2 OH → Ca(OH)2
+
+
e
NH3 + H → NH4
f
H + HCO3 → H2O + CO2
+
-
2+
+ SO4 → CaSO4
2+
+ 2 Cl → PbCl2
g
Ca
h
Pb
i
+
2-
-
-
H + OH → H2O
TASK 7 – Significant figures & standard form
1
2
3
4
5
a
a
a
a
a
345800
2350000
0.0015
-4
1.64 x 10
0.0214
b
b
b
b
b
297000
0.250
0.00046
-2
5.24 x 10
-5
6.14 x 10
c
c
c
c
c
0.0790
13.7
357500
-8
1.5 x 10
8
4.00 x 10
d
d
d
d
d
6.00
30.0
534
4
3.45 x 10
2400
e
e
e
e
e
0.00156
0.00198
1030000
-1
6.2 x 10
0.0610
50.3
20.4 g
0.25
0.10
c
c
c
c
0.500
1.08 g
0.50
0.15
d
d
17100
0.264 g
e
e
0.000107
85.8 g
f
f
f
f
f
0.01000
0.000313
0.00835
7
8.7 x 10
-7
8.00 x 10
TASK 8 – Moles
1
2
3
4
5
6
a 2.96
b
a 355 g
b
a 0.25
b
a 0.050
b
176
-24
a 1.670 x 10 g
b 1.673 x 10
-24
g
c 5.023 x 10
-24
g
TASK 9 – What equations mean
1
12 mol Na + 3 mol O2 → 6 mol Na2O; 0.1 mol Na + 0.025 mol O2 → 0.05 mol Na2O
2
5 mol Al + 7.5 mol Cl2 → 5 mol AlCl3; 0.1 mol Al + 0.15 mol Cl2 → 0.1 mol AlCl3
3
0.5 mol C4H10 + 3.25 mol O2 → 2 mol CO2 + 2.5 mol H2O; 20 mol C4H10 + 130 mol O2 → 80 mol CO2 + 100 mol H2O
4
0.5 mol NH3 + 0.375 mol O2 → 0.25 mol N2 + 0.75 mol H2O; 10 mol NH3 + 7.5 mol O2 → 5 mol N2 + 15 mol H2O
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07-Jul-12
Chemsheets AS 008
2
TASK 10 – Reacting mass calculations 1
1
7
13
1.01 g
7
115 g
2
8
14
126 g
6
1650000 g
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3
9
15
120 g
9780 g
64.0 g
4
10
16
07-Jul-12
253000 g
1562000 g
89.3 g
5
11
17.6 g
0.00940 g
6
12
12.0 g
1.11 g
Chemsheets AS 008
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Chemsheets AS 008
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TASK 11 – Reacting mass calculations 2
1
2
3
8
a 2 mol NH3
a 3 mol SO3
7.88 g
1250 g
b
b
4
9
6 mol NH3
3 mol SO3
2694 g
42.9 g
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c
c
5
1.33 mol NH3
0.04 mol SO3
303000 g
d
d
6
07-Jul-12
1.0 mol NH3
0.8 mol SO3
98.6 g
e
e
7
4 mol NH3
2 mol SO3
1210 g
Chemsheets AS 008
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07-Jul-12
Chemsheets AS 008
6
CHALLENGE 1
1
NaHCO3 = 3.51 g, Na2CO3 6.49 g
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2
CaCO3 = 40.3%, MgCO3 = 59.7%
07-Jul-12
3
C4H8
4
26.6%
Chemsheets AS 008
7
TASK 12 – Percentage yield
1
2
4
6
a
a
a
a
120 g
700000 g
25.2 g
330 g
b
b
b
b
74.9%
92.3%
79.4%
90.8%
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c
reversible, product lost on isolation, other reactions take place
3
a
510 g
b
30.0%
5
a
529 g
b
94.4%
7
a
2.40 g
b
88.4%
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Chemsheets AS 008
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Chemsheets AS 008
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TASK 13 – Atom economy
1
7
39.3%
2
1.5%
3
45.8%
4
56.0%
5
100%
6
47.1%
a 320 g
b
87.5%
c
29.5%
d % yield compares the amount produced compared to the amount you should get, atom economy is the proportion
of the mass of all the products that is the desired product
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07-Jul-12
Chemsheets AS 008
10
TASK 14 – Ideal gas equation
1
2
8
a 473 K
b
-3
3
1.24 x 10 m 3
3.36 g
9
98000 Pa
0.786
3
0.000538 m
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c
4
10
-6
50 x 10 m
104000 Pa
3
4.53 m
3
d
5
11
07-Jul-12
223 K
155 K
64.1
e
6
12
100000 Pa
71.0
483 K
f
7
13
-3
3
3.2 x 10 m
3
0.00380 m
126400 Pa
Chemsheets AS 008
11
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07-Jul-12
Chemsheets AS 008
12
TASK 15 – Reacting gas volumes
1
3
3
3
3
3
a O2 2 dm , CO2 1 dm
b
O2 120 cm , CO2 80 cm
3
3
3
3
3
d
O2 5625 cm , CO2 4500 cm q
2
20 cm HBr left at end
c O2 1250 cm , CO2 1000 cm
3
3
3
3
3
3
3
4
4 dm O2, 4 dm H2O, 4 dm SO2, total 12 dm gas
300 cm O2, 100 cm CO2, total 400 cm gas at end
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Chemsheets AS 008
13
CHALLENGE 2
1
44.0
2
1 : 3.11, 40.9 g
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3
NS
4
C2H4
07-Jul-12
5
515 ms
-1
6
C3H8
Chemsheets AS 008
14
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07-Jul-12
Chemsheets AS 008
15
Calculations CHECK-UP
1
2
a Zn(NO3)2 b
Pb
c
Cr2O3
d
(NH4)2SO4
e P4
f
N2
g
Ba(OH)2
h
Al2(SO4)3
H2SO4, KOH, 1:2; HCl, KHCO3, 1:1; HNO3, NH3, 1:1; HCl, ZnCO3, 2:1
3
a
+
+
4
5
6
8
9
11
12
14
15
17
-
H + OH → H2O
b
+
2+
2-
Ba + SO4 → BaSO4
+
-
c H + NH3 → NH4
d
H + HCO3 → H2O + CO2
th
12
b
it is the agreed standard
a average mass of an atom, relative to 1/12 mass of C atom
c mixture of other isotopes
a H2, NH3 = 3.3.3
b
H2, NH3 = 3.33
d
H2, NH3 = 0.033
c N2, NH3 = 20
-4
3
-3
3.10 x 10 m
7
8.21 x 10
3
3
3
3
a volume of CO2 = 57.1 cm , total = 128.5 cm
b
volume of CO2 = 200 cm , total = 350 cm
3
3
c volume of CO2 = 228.6 cm , total = 314.3 cm
-3
3
3
2.00 x 10 m
10 1.64 m
a 40, 60
b
40, 20
c
5.84, 8.76
193.5 g
13 9.39 g
a 1250 g
b
96%
c
reversible, product lost on isolation, other reactions
d
100%
a 529 g
b
94.5%
c
52.9%
16 7
-3
3
b
1.30 g, 2.77 g
a 0.05, 0.05, 1.22 x 10 m , 4.07 g
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Chemsheets AS 008
16
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07-Jul-12
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07-Jul-12
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07-Jul-12
Chemsheets AS 008
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07-Jul-12
Chemsheets AS 008
21
TASK 16 – Solution calculations
1
2
3
4
7
10
13
a 0.1
b
250
-3
-3
a 0.2 mol dm , 7.3 g dm
3
3
b
0.001 dm
a 0.05 dm
-3
-3
0.0269 mol dm , 4.61 g dm
-3
-3
0.015 mol dm , 71.0 g dm
87.8
90.8%
© www.CHEMSHEETS.co.uk
c
b
0.0025
-3
-3
2.5 mol dm , 245.3 g dm
5
8
11
0.0752 mol dm , 3.01 g dm
1.13 g
2
-3
07-Jul-12
-3
-3
-3
c
2.1 mol dm , 84.0 g dm
6
9
12
0.0075 dm
3
79.9 dm
Ar = 39.1, K
3
Chemsheets AS 008
22
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07-Jul-12
Chemsheets AS 008
23
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07-Jul-12
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24
TASK 17 – Back titration calculations
1
4
87.7%
0.606 g
2
5
90.8%
4.01 g
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3
0.05 mol, 4.22 g
07-Jul-12
Chemsheets AS 008
25
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07-Jul-12
Chemsheets AS 008
26
CHALLENGE 3
1
96.7%
2
A Si2OCl6
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07-Jul-12
Chemsheets AS 008
27
TASK 18 – Empirical & molecular formulas
1
2
3
4
5
9
a CH3
b
f
e CH2O
a N2H4
b
a 3:2
b
e 3:4
f
a CaBr2
b
6
FeCl3
C5H10O, C5H10O
P2O3
C2H7N
C4H10
1:2
5:3
Na2S2O3
K2SO4
© www.CHEMSHEETS.co.uk
c
g
c
c
g
c
7
10
SO2
B3H5
C5H10
5:1
4:5
C2H7N
P2O3, P4O6
x = 4, y = 2
d
h
d
d
h
d
8
07-Jul-12
CH2
C12H22O11
PH3
e
2:5
4:7
CO2
e
CH2O, C2H4O2
C6H6
f
C3H6
NO2
Chemsheets AS 008
28
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07-Jul-12
Chemsheets AS 008
29
Calculation Allsorts
1
6
C5H11NO
2
-3
0.0241 mol dm
C11H14O2, C11H14O2
7
234.9
10
10 Al + 6 NH4ClO4 → 3 N2 + 9 H2O + 6 HCl + 5 Al2O3
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3
8
07-Jul-12
526 g
3.21%
4
9
2.71 g
55.0%
5
5.00 dm
Chemsheets AS 008
3
30
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07-Jul-12
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31