Free Printable IGCSE Chem 04

Worksheets

IGCSE Chem 04

Total questions: 20

Worksheet time: 32mins

Name

Class

Date

The equation shows the reaction between magnesium and sulfuric acid.

[Ar: H, 1; O, 16; Mg, 24; S, 32]

Mg + H₂SO₄ → MgSO₄ + H₂

In this reaction, which mass of magnesium sulfate is formed when 6 g of magnesium react with excess sulfuric acid?

A 8

B 24

C 30

D 60

Two atoms of magnesium, Mg, react with one molecule of oxygen, O₂.

What is the formula of the product?

A MgO

B MgO₂

C Mg₂O

D Mg₂O₂

What is the relative molecular mass (M_r) of HNO₃?

A 5

B 31

C 32

D 63

The relative formula mass, Mr, of copper(II) sulfate, CuSO₄, is 160.

Which mass of sulfur is present in 160 g of copper(II)sulfate?

A 16 g

B 32 g

C 64 g

D 128 g

A compound has the formula CH₃CO₂H.

How should the relative molecular mass, M_r, of this compound be calculated?

A 12 + 1 + 16

B 3(12 + 1) + 2(12 + 16) + 1

C (4 × 12) + (2 × 1) + 16

D (2 × 12) + (4 × 1) + (2 × 16)

he equation shows the reaction between magnesium and sulfuric acid.

Mg + H₂SO₄ → MgSO₄ + H₂

(Mg = 24, H = 1, S = 32, O = 16)

In this reaction, what mass of magnesium sulfate will be formed when 6 g of magnesium reacts with excess sulfuric acid?

A 8

B 24

C 30

D 60

Which relative molecular mass, M_r, is not correct for the molecule given?

The structure of an organic compound, X, is shown.

What is the molecular formula of X?

A C₆H₉

B C₆H₁₂

C C₇H₁₂

D C₇H1₄

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

2, 2, 1

2, 3, 2

1, 2, 2

1, 3, 1

10.

WO₃ + H₂ --> W + H₂O
What coefficient goes in front of H₂?

11.

The equation for Percent Yield:

(predicted/experimental) X 100

(experimental/predicted) X 100

(experimental - predicted)/ Predicted X 100

12.

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?

bread

jelly

peanut butter

sandwich

13.

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of Mg to moles Fe?

3mol Mg / 2 mol Fe

2 mol Mg/ 3 mol Fe

1 mol Fe/ 2 mol Fe

3 mol MgO / 2 mol Fe

14.

When does a chemical reaction stop?

When the lab is finished

When the excess reactant is used up

When the limiting reactant is used up

Chemical reactions never stop

15.

The Formula to make S'mores is:
2C + 1M + G₂→ C₂MG₂. If you have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham Cracker Halves (G), how many S'mores can you make?

16.

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

theoretical yield

mole ratio

actual yield

percentage yield

17.

What is the measured amount of a product obtained from a chemical reaction?

mole ratio

theoretical yield

percentage yield

actual yield

18.

For the reaction represented by the equation Cl₂ + 2KBr → Br₂ + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?

749 g

225 g

479 g

814 g

19.

N₂ + 3H₂ → 2NH₃
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

20.

Use the following equation:
NaIO₃(aq) + 6HI(aq) --> 3I₂(s) + NaI(aq) + 3H₂O(l)
How many moles of iodine can be made from 6.55 moles of NaIO₃?

4.55 moles I₂

23.18 moles I₂

19.65 moles I₂

34.99 moles I₂

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IGCSE Chem 04

Total questions: 20

Worksheet time: 32mins

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