Mock IGCSE Examination Paper - International School of Siem Reap

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Mock IGCSE Examination Paper

CHEMISTRY PAPER 3 Extended

1 hour 15 minutes

Answer questions on the Question Paper. Answer all questions. A copy of the Periodic Table is printed on page 12.

The questions in this sample were taken from Cambridge IGCSE Chemistry 0620

Question 1&2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9

Paper 3 Q1&2 November 2006 Paper 3 Q3 November 2007 Paper 31 Q4 June 2008 Paper 31 Q6 June 2009 Paper 31 Q5 June 2009 Paper 3 Q7 November 2007 Paper 31 Q8 June 2008 Paper 32 Q9 June 2009

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1 Choose a gas from the following list to answer the questions below. Each gas may be used once, more than once or not at all.

ammonia argon carbon dioxide

ethene hydrogen

nitrogen

carbon monoxide oxygen

chlorine

Which gas

i. is a noble gas,

ii is an acidic oxide,

iii can be polymerised,

iv is the active component of air,

v is used in the treatment of water,

vi is a product of respiration?

[6]

2 The table shows the melting points, boiling points and electrical properties of the six substances A to F.

substance

A B C D E F

melting point/?C

961 113

0 803 25 to 210 285

boiling point/?C

2193 444 100 1465 102 to 105 260

electrical conductor at room

temperature good

does not conduct very poor

does not conduct good

does not conduct

electrical conductor of substance

dissolved in water does not dissolve does not dissolve

very poor good good

does not dissolve

i Which three substances are solids at room temperature?

[1]

ii Which one is an ionic compound?

[1]

iii Which one is a gas at room temperature?

[1]

iv Which two substances are liquids at room temperature?

[1]

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v Which substance is a metal?

[1]

vi Which one is an impure substance?

[1]

3 Magnesium reacts with bromine to form magnesium bromide. a Magnesium bromide is an ionic compound. Draw a diagram that shows the formula of the compound, the charges on the ions and the arrangement of outer electrons around the negative ion. The electron distribution of a bromine atom is 2, 8, 18, 7.

Use x to represent an electron from a magnesium atom.

Use o to represent an electron from a bromine atom.

[3]

b In the lattice of magnesium bromide, the ratio of magnesium ions to bromide ions is 1:2. i Explain the term lattice.

[2] ii Explain why the ratio of ions is 1:2.

[1] iii The reaction between magnesium and bromine is redox. Complete the sentences.

Magnesium is the

agent because it has

electrons.

Bromine has been

because it has

electrons.

[4]

[Total: 10]

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4 Sulfuric acid is a typical strong acid. a Change the equations given into a different format. i Mg 1 H2SO4 MgSO4 1 H2 Change into a word equation.

ii lithium oxide 1 sulfuric acid lithium sulfate 1 water Change into a symbol equation.

iii CuO 1 2H1 Cu21 1 H2O Change the ionic equation into a symbol equation.

iv Na2CO3 1 H2SO4 Na2SO4 1 CO2 1 H2O Change into a word equation.

b When sulfuric acid dissolves in water, the following reaction occurs. H2SO4 1 H2O HSO42 1 H3O1 Explain why water is behaving as a base in this reaction.

c Sulfuric acid is a strong acid, ethanoic acid is a weak acid. Explain the difference between a strong acid and a weak acid.

4

[1] [2] [2] [1] [2]

[2] [Total: 10]

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5 Ammonia is manufactured by the Haber process. N2(g) 1 3H2(g) 2NH3(g) the forward reaction is exothermic

a i Name the raw materials from which nitrogen and hydrogen are obtained.

nitrogen from

[1]

hydrogen from

[1]

ii Name the catalyst used in this process.

[1] iii What is the most important use of ammonia?

[1]

b The following graph shows how the percentage of ammonia in the equilibrium mixture changes with temperature.

% ammonia at equilibrium

00

i Explain the term equilibrium.

temperature

[2] ii How does the percentage of ammonia vary with temperature?

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