CIE IGCSE Chemistry (SPECIMEN 2023)

Which statement about liquids and gases is correct?

• A given mass of liquid has a fixed volume at room temperature.

• 1 cm3 of gas contains more particles than 1 cm3 of liquid.

• Particles in a liquid have fixed positions.

• Particles in a liquid can easily be forced closer together.

Which process led to the change in the damp red litmus paper?

• Crystallisation

• Distillation

• Condensation

• Diffusion

Which pair of atoms contains the same number of neutrons?

• 
• 
• 
• 

Which statement describes the bonding in sodium chloride?

• A weak force of attraction between oppositely charged ions.

• A strong force of attraction between two molecules.

• A strong force of attraction between oppositely charged ions.

• A shared pair of electrons between two atoms leading to a noble gas configuration.

A covalent molecule M contains a total of four shared electrons.

What is M?

• Hydrogen chloride, HCl

• Ammonia, NH3

• Water, H2O

• Methane, CH4

Which statement explains why the pencil moves across the paper more easily when the percentage of graphite is increased?

• Graphite has a high melting point.

• Graphite is a form of carbon.

• Graphite is a lubricant.

• Graphite is a non-metal.

A compound with the formula XO2 has a relative formula mass of 64.

What is X?

• Sulfur

• Gadolinium

• Copper

• Cadmium

What is observed at each electrode when molten lead(II) bromide is electrolysed using platinum electrodes?

• Shiny grey liquid at the negative electrode and bubbles of a colourless gas at the positive electrode.

• Bubbles of a colourless gas at the negative electrode and bubbles of a brown gas at the positive electrode.

• Bubbles of a colourless gas at both electrodes.

• Shiny grey liquid at the negative electrode and bubbles of a brown gas at the positive electrode.

Which materials are used as the negative electrode and positive electrode when aqueous nickel(II) sulfate is used as the electrolyte to electroplate a piece of steel with nickel?

• Steel at the negative electrode, and nickel at the positive electrode

• Platinum at the negative electrode, and nickel at the positive electrode

• Nickel at the negative electrode, and steel at the positive electrode

• Carbon at the negative electrode, and steel at the positive electrode

Which waste products are released from the exhaust of a vehicle powered using a hydrogen-oxygen fuel cell?

• Water

• Carbon dioxide, oxides of nitrogen, water

• Carbon dioxide

• Carbon dioxide, oxides of nitrogen