WorksheetsIGCSE CHEMISTRY: STOICHIOMETRY
Total questions: 50
Worksheet time: 3hrs 30mins
Name
Class
Date
1.
What is Avogadro's number?
a)
6.02 x 1023
b)
1 mole
c)
600 million
d)
6.02
2.
How many moles are in 6.02 x 1023 molecules of H2O?
a)
1 mole
b)
2 moles
c)
6.02 moles
d)
602000000000000000000000 moles
3.
One mole of carbon dioxide (CO2) contains 6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
4.
A mole is:
a)
The SI unit for mass
b)
The SI unit for the amount of a substance
c)
The SI unit for volume
d)
The SI unit for area
5.
Which has the most particles?
a)
1 mole H2
b)
1 mole Na1+
c)
1 mole Al(OH)3
d)
These are all the same
6.
How many atoms are in 1 mole of Iodine (I)?
a)
6.02 x 1023
b)
4.02 x 1023
c)
6.02 x 1025
d)
4.02 x 1025
7.
How is moles abbreviated?
a)
M
b)
m
c)
mol
d)
ml
8.
NaCl represents
a)
Sodium bicarbonate
b)
Sodium carbonate
c)
Sodium Chloride
d)
Calcium Carbonate
9.
NaOH represents
a)
Sodium bicarbonate
b)
Sodium carbonate
c)
Sodium Chloride
d)
Sodium Hydroxide
10.
CaCO3 represents
a)
Sodium bicarbonate
b)
Sodium carbonate
c)
Sodium Chloride
d)
Calcium Carbonate
11.
MgO represents
a)
Magnesium Hydroxide
b)
Magnesium Chloride
c)
Magnesium Oxide
d)
Sodium Nitrate
12.
How many atoms of sulfur are in each molecule of H2SO4?
a)
1
b)
4
c)
2
d)
7
13.
How many atoms are there in the compound MgCO3?
a)
3
b)
4
c)
5
d)
6
14.
Chemical Formula used for Aluminium oxide is
a)
AlO
b)
Al2O3
c)
AlO4
d)
AlO2
15.
Chemical Formula used for Aluminium Chloride is
a)
AlCl2
b)
Al2Cl
c)
AlCl3
d)
AlCl
16.
Chemical Formula used for Aluminium Sulphate is
a)
AlSO2
b)
AlSO4
c)
Al(SO4)3
d)
Al2(SO4)3
17.
What is the molar mass of NaOH?
a)
368 g/mole
b)
40 g/mole
c)
57 g/mole
d)
23 g/mole
18.
36.0 g of Be contains how many moles?
a)
0.25 mol
b)
4.0 mol
c)
45 mol
d)
320 mol
19.
4.0 moles of H2O would have what mass?
a)
72 g
b)
23 g
c)
68 g
d)
4.5 g
20.
A mass of 6 g of Carbon contains
a)
1 mole of C
b)
2 moles of C
c)
0.5 moles of C
d)
72 moles of C
21.
How many moles are in 22 g of argon?
a)
880 moles
b)
0.55 moles
c)
1.81 moles
d)
5 moles
22.
How many moles are in 15 grams of lithium?
a)
0.5 moles
b)
104.1 moles
c)
2.2 moles
d)
50 moles
23.
How many grams are in 88.1 moles of magnesium?
a)
2141 g
b)
0.3 g
c)
30 g
d)
3.6 g
24.
Given the equation:
2NaClO3 (s) → 2NaCl (s) + 3O2 (g)
2.00 moles of NaClO3 will produce how many grams of O2? (mass of O2 = 32g/mol)
a)
56 g of O2
b)
96 g of O2
c)
64 g O2
d)
32 g O2
25.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
26.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
27.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
28.
In the equation 2 Al2O3 --> 4 Al + 3 O2, what is the mole ratio of aluminum to oxygen?
a)
10:6
b)
3:4
c)
4:3
d)
2:3
29.
What is a mole, as it relates to chemistry?
a)
A furry creature that lives underground
b)
6.02 x 1023 # of things
c)
Something you need removed from your skin
d)
A sauce used in Mexican cooking
30.
The mass of one mole of H2SO4 is?
a)
98 g
b)
49 amu
c)
98 amu
d)
49 g
31.
2H2 + O2 → 2H2O
How many moles of oxygen are consumed if 8 moles H2 are used?
How many moles of oxygen are consumed if 8 moles H2 are used?
a)
2
b)
4
c)
6
d)
8
32.
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?
a)
3mol Mg / 2 mol Fe
b)
2 mol Mg/ 3 mol Fe
c)
1 mol Fe/ 2 mol Fe
d)
3 mol MgO / 2 mol Fe
33.
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
a)
6.7 mol
b)
1.0 mol
c)
10.1 mol
d)
4.5 mol
34.
SiO2 + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
a)
96 g
b)
0.67 g
c)
2.67 g
d)
48 g
35.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
36.
KNO3 --> KNO2 + O2 What numbers are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
37.
The equation for Percent Yield:
a)
(predicted/experimental) X 100
b)
(experimental/predicted) X 100
c)
(experimental - predicted)/ Predicted X 100
38.
2H2 + O2 → 2H2O
How many moles of water can be produced if 8 moles H2 are used?
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
39.
What is a Limiting Reagent?
a)
speeds up a reaction
b)
what you run out of first
c)
what you have left over
d)
slows down a reaction
40.
What is a Excess Reagent?
a)
amount you end with
b)
what you run out of first
c)
what you have left over
d)
what you start with
41.
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich. If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?
a)
bread
b)
jelly
c)
peanut butter
d)
sandwich
42.
If you predicted that 1.5 moles of Magnessium are used in a reaction, and you have 2.0 moles of Magnessium, what type of reactant is Magnessium?
a)
Limiting Reactant
b)
Excess Reactant
c)
Fast Reacter
d)
Non-Reactant
43.
When does a chemical reaction stop?
a)
When the lab is finished
b)
When the excess reactant is used up
c)
When the limiting reactant is used up
d)
Chemical reactions never stop
44.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
45.
N2 + 3H2 → 2NH3
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
46.
2H2 + O2 → 2H2O
How many moles of water can be produced if 8 moles H2 are used?
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
47.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
48.
What is the measured amount of a product obtained from a chemical reaction?
a)
mole ratio
b)
theoretical yield
c)
percentage yield
d)
actual yield
49.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
50.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
100 %
