iGCSE Chemistry (0620) Core:2.1 Elements, compounds and mixtures: Exam Style Questions Paper 1

Question

Which statement about the boxes P, Q and R is correct?

A) Box P contains two compounds, and box R contains two elements.
B) Box P contains two elements, and box Q contains a mixture.
C) Box P contains two elements, and box Q contains one compound.
D) Box Q contains two compounds, and box R contains a mixture.

▶️ Answer/Explanation

Solution

Ans: C

Without the diagram, we can analyze the options based on typical exam patterns:

Option C is correct because it’s common for exam questions to show two elements (like separate atoms of different types) in one box (P), and a compound (molecules made of bonded atoms) in another box (Q).

The other options are less likely because:

A: If P contains two compounds, R would typically show a mixture, not elements.

B: If Q contains a mixture, it would show separate compounds/elements, not just one type.

D: Two compounds in Q would typically be shown as distinct molecules, which would make R a mixture of these, but this is less common in basic questions.

Question

A diagram representing a mixture of four particles is shown.

Which statement describes the mixture of particles?

A) It is a mixture of two different compounds.
B) It is a mixture of two different elements.
C) It is a mixture of four different compounds.
D) It is a mixture of four different elements.

▶️ Answer/Explanation

Solution

Ans: A

While the diagram isn’t shown, we can deduce from the answer choices and the correct answer (A) that:

The mixture must contain two types of compounds (molecules made of different elements bonded together).

For example, it might show H₂O molecules and CO₂ molecules mixed together – two different compounds, each made of multiple atoms.

Option B would describe a mixture like O₂ and H₂ (two elements), which isn’t the case here.

Question

Matter exists as elements, compounds and mixtures. Which row identifies an element, a compound and a mixture?

▶️Answer/Explanation

Ans:

Calcium is an element.

Sodium chloride, NaCl is a compound formed from Na and Cl elements.

Brass is a mixture of copper and zinc. It is an alloy, which is a solid solution of two or more metals. Brass typically contains varying proportions of copper and zinc, with the exact composition depending on the desired properties and specific application.

Question

Which substances can be separated by filtration?

A insoluble liquid and water

B insoluble solid and water

C solution of soluble liquid in water

D solution of soluble solid in water

▶️Answer/Explanation

Ans:B

Filtration is an effective method for separating insoluble solids from a liquid, as the filter paper acts as a physical barrier, allowing only the liquid to pass through while retaining the solid particles.

iGCSE Chemistry (0620) Core:2.1 Elements, compounds and mixtures: Exam Style Questions Paper 1

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