IGCSE Coordinated Chemistry Workout 11

The three states of matter are represented by diagrams X, Y and Z. Which change occurs during condensation?

• X to Y

• X to Z

• Y to X

• Z to X

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The diagram shows a circuit. Solid X makes the lamp light. What is solid X?

• rubber

• silicon (IV) oxide

• sulfur

• zinc

Which two elements are present in the compounds found in petroleum?

• carbon and nitrogen

• carbon and oxygen

• hydrogen and carbon

• hydrogen and oxygen

Which molecules join into long chains to make proteins?

• amino acids

• ethene

• glucose

• starch

Which material is made from silicon (IV) oxide combined with metal oxides?

• brass

• glass

• polythene

• steel

Carbon is used in the extraction of some metals from their ores because

1 carbon forms strong alloys with metals,

2 carbon reacts with oxygen in the ore.

Which of these statements are correct?

• 1 only

• 2 only

• both 1 and 2

• neither 1 nor 2

Sodium chloride solution is electrolysed and a gas is collected at each electrode. One gas decolourises moist litmus paper, the other gas burns with a pop.

Which statement is correct?

• Chlorine gas is collected at the anode.

• Hydrogen gas is collected at the anode.

• Oxygen gas is collected at the cathode.

• The cathode is the positive electrode.

Compound X is heated gently with aluminium powder and sodium hydroxide solution. The damp red litmus paper turns blue.

What does X contain?

• carbonate

• chloride

• nitrate

• sulfate

Elements X and Y react together to form a compound.

The diagram shows the outer shells of X and Y after reaction.

Which statement is correct?

• X is in group VII and has formed the X⁺ ion.

• X is in group VII and has formed the X^– ion.

• X is in group VIII and has formed the X⁺ ion.

• X is in group VIII and has formed the X^– ion.

Waste material buried underground can decay to form gas X which can be used as a fuel. X burns to form an oxide Y and water.

X + oxygen → Y + water

What is Y?

• carbon dioxide

• nitrogen dioxide

• sulfur dioxide

• sulfur trioxide