Placement test IGCSE Chemistry V01

1) The changes that occur when a substance changes state are shown below.

	1.	2.	3.	4.
A	W	X	Y	Z
B	W	Y	X	Z
C	X	Y	Z	W
D	X	Z	Y	W
E	I don’t have any ideas.

2) Concentrated ammonia solution gives off ammonia gas. Concentrated hydrochloric acid gives off hydrogen chloride gas. Ammonia, NH₃, and hydrogen chloride, HCl, are both colourless gases. Ammonia reacts with hydrogen chloride to make the white solid ammonium chloride.

 

Apparatus is set up as shown.

After ten minutes, a white solid forms in the tube where the gases meet. Name the process by which the concentrated hydrochloric acid gives off hydrogen chloride gas and which the ammonia and hydrogen chloride gases move in the tube.

3) The diagram shows a chromatogram for a different food dye. Some distances are shown on the diagram.

 

 

What is the R_f value for this food dye?

4) The diagram shows the structure of three particles, R, S, and T.

 

 

Which row describes these particles?

 

	atoms	isotopes
A	R	S and T
B	R	R and S
C	R and T	R and T
D	R and T	R, S, and T
E	I don’t have any ideas.

5) Strontium chloride and barium bromide are halide compounds of Group II elements. Strontium chloride has the formula ......1......, a relative formula mass ......2...... that of barium bromide and bonds that are ......3...... .

Which words correctly complete gaps 1, 2, and 3?

	1	2	3
A	SrCl	different form	ionic
B	SrCl	the same as	covalent
C	SrCl2	different form	ionic
D	SrCl2	the same as	covalent
E	I don’t have any ideas.

6) Iodine forms a chloride which has the composition by mass as follows; I, 78.2%; Cl, 21.8%. Use this information to determine the empirical formula of this chloride of iodine.

 

7) The diagram shows the electrolysis of concentrated hydrochloric acid and brine using carbon electrodes.

 

At which electrode(s) is hydrogen produced?

8) An aqueous solution of calcium nitrate was made by adding excess calcium carbonate to dilute nitric acid. The mixture was heated, stirred, and then filtered.

 

What was the pH of the solution added by the calcium carbonate before and after filtration?

	before filtration	after filtration
A	greater than 7	7
B	less than 7	less than 7
C	less than 7	7
D	7	greater than 7
E	I don’t have any ideas.

9) The energy level diagram for the reaction between calcium carbonate and dilute nitric acid is shown.

 

Which row correctly describes the type of reaction and the energy of the reactants and products?

	type of reaction	energy of the reactants and products
A	endothermic	the products have more energy than the reactants
B	endothermic	the reactants have more energy than the products
C	exothermic	the products have more energy than the reactants
D	exothermic	the reactants have more energy than the products
E	I don’t have any ideas.

10) Zinc is reacted with a dilute acid.

The hydrogen gas is collected and its volume measured.

The results are shown on the graph.

What is the volume of hydrogen produced during the fourth minute?

11) A reversible reaction at equilibrium is shown.

2NO₂(g) ⇋ N₂O₄(g)                ΔH = - 58 kJ/mol

Which statement about an equilibrium mixture of NO₂ and N₂O₄ is correct?

12) Compound X is heated with copper(II) oxide using the apparatus shown.

A brown solid copper metal is formed in the reaction tube and the limewater turns cloudy

What is compound X?

13) The formulae of four compounds, W, X, Y and Z are given.

 

compound	formula
W	FePO4
X	NH4NO3
Y	K3PO4
Z	KBr

Which mixture of compounds makes a complete fertiliser?

14) The following substances can be formed when petrol is burnt in a car engine.

Which substance is poisonous to human bodies?

15) The diagram shows the structure of a compound.

 

Which functional groups does this molecule contain?

	carboxylic acid	alkene	alcohol
A	no	no	no
B	no	yes	yes
C	yes	no	yes
D	yes	yes	yes
E	I don’t have any ideas.

16) Alkenes are manufactured by cracking hydrocarbons obtained from petroleum.

 

Which row describes the process of cracking?

	boiling point of X	boiling point of Y	temperature required
A	higher	lower	low
B	higher	lower	high
C	lower	higher	low
D	lower	higher	high
E	I don’t have any ideas.

17) The diagram shows four repeat units in the structure of an addition polymer.

 

Which alkene monomer is used to make this polymer?

18) Fats are esters, which are products others are unsaturated.

Fat 1 has the formula

Fat 1 is the product of two types of molecules, A and B. The diagram shows parts of molecules A and B in the structure of Fat 1. Deduce the functional groups in molecules A and B that form the ester bond in Fat 1 by condensation reaction.

	functional group of molecule A	functional group of molecule B
A	alcohol	carboxylic acid
B	carboxylic acid	alcohol
C	ester	alcohol
D	carboxylic	ester
E	I don’t have any ideas.

19) One of the instructions for an experiment reads as follows.

Quickly add 65 cm³ of dilute sulfuric acid to the mixture.

What is the best piece of apparatus to use?

 

20) A substance is heated with aluminium foil in aqueous sodium hydroxide. A gas is produced which turns damp, red litmus paper blue. Which anion is present in the substance and what is the gas produced?

 

	Anion	Gas produced
A	carbonate	carbon dioxide
B	iodide	iodine
C	nitrate	ammonia
D	sulfate	sulfur dioxide
E	I don’t have any ideas.