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IGCSE Stoichiometry

Total questions: 40

Worksheet time: 2hrs 20mins

Name
Class
Date
1.

Calcium phosphate contains phosphate ion, PO43-.

What is the formula for calcium phosphate?

(You do not need to subscript the numbers)

(a)  

2.

An oxide of nitrogen has the following composition by mass: N, 30.4%; O, 69.6%.


It has a relative molecular mass of 92.


What is the molecular formula of the oxide of nitrogen?

(Ar N=14, O=16)

a)

N2O3

b)

NO2

c)

N2O4

d)

NO

3.

Propane burns in oxygen.

C3H8 + xO2 → 3CO2 + yH2O

Which values of x and y balance the equation?

a)

x = 4, y = 5

b)

x = 5, y = 4

c)

x = 2, y = 4

d)

x = 3, y = 4

4.

The relative formula mass, Mr, of calcium carbonate, CaCO3, is 100.

Ar Ca=40, C=12, O=16.


What is the mass of carbon present in 100 g of calcium carbonate?

(a)  

5.

The compound magnesium nitrate has the formula Mg(NO3)2.

What is the relative formula mass of magnesium nitrate?

(Ar Mg=24, N=14, O=16)

(a)  

6.

Which statements are correct?

(Ar Ca=40, C=12, O=16, H=1, Cl=35.5)

a)

1 and 2

b)

2 and 4

c)

1 and 3

d)

2 and 3

7.
a)

A

b)

B

c)

C

d)

D

8.

a)

A

b)

B

c)

C

d)

D

9.

a)

A

b)

B

c)

C

d)

D

10.

What is Avogadro's number?

a)

6.02 x 1023

b)

1 mole

c)

600 million

d)

6.02

11.

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

12.

One mole of carbon dioxide (CO2) contains 6.02 x 1023 _____.

a)

atoms

b)

formula units

c)

ions

d)

molecules

13.

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

14.

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

15.

How is moles abbreviated?

a)

M

b)

m

c)

mol

d)

ml

16.
NaCl represents 
a)
Sodium bicarbonate
b)
Sodium carbonate
c)
Sodium Chloride
d)
Calcium Carbonate
17.
NaOH represents 
a)
Sodium bicarbonate
b)
Sodium carbonate
c)
Sodium Chloride
d)
Sodium Hydroxide
18.

CaCO3 represents

a)

Sodium bicarbonate

b)

Sodium carbonate

c)

Sodium Chloride

d)

Calcium Carbonate

19.

How many atoms of sulfur are in each molecule of H2SO4?

a)

1

b)

4

c)

2

d)

7

20.
What is the molar mass of NaOH?
a)
368 g/mole 
b)
40 g/mole
c)
57 g/mole
d)
23 g/mole
21.
4.0 moles of H2O would have what mass?
a)
72 g
b)
23 g
c)
68 g
d)
4.5 g
22.
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
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? 
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?
a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
27.
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
28.
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
29.
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
30.
2 KClO3 → 2 KCl + 3 O2
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
31.
 SiO2 + 3C → SiC + 2CO
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
32.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  
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
33.

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
34.
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
35.
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
36.
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
37.
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
38.
Using the following equation:
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
39.
N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
40.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
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

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