Model Paper 9th Grade Chemistry

Attempt all questions.
Marks are shown in brackets next to each question.
Section A (Multiple Choice) (8 marks)

The basic unit of a substance is called:
(a) atom
(b) molecule
(c) compound
(d) element ([1])
The process of changing a liquid into a gas is called:
(a) evaporation
(b) condensation
(c) sublimation
(d) filtration ([1])
An element that readily loses electrons is called a:
(a) metal
(b) non-metal
(c) noble gas
(d) metalloid ([1])
The pH of a neutral solution is:
(a) 0
(b) 7
(c) 14
(d) Less than 7 ([1])
Which of the following is NOT a mixture?
(a) Air
(b) Salt solution
(c) Iron
(d) Alloy ([1])
The chemical formula for water is:
(a) H2O
(b) CO2
(c) NaCl
(d) CaO ([1])
The process of separating a mixture of two immiscible liquids is called:
(a) decantation
(b) filtration
(c) evaporation
(d) chromatography ([1])
The balance between reactants and products in a reversible reaction is called:
(a) equilibrium
(b) activation energy
(c) catalyst
(d) exothermic reaction ([1])
Section B (Short Answer) (12 marks)

Define the term atom. Briefly explain the structure of an atom. ([2])
Differentiate between physical and chemical changes with one example each. ([2])
What is the difference between an acid and a base? Give one example of each. ([2])
Balance the following chemical equation: Fe + O2 -> Fe2O3 ([2])
Describe two methods for separating a mixture of sand and salt. ([2])
What is the role of a catalyst in a chemical reaction? ([2])
Section C (Long Answer) (10 marks)

Write a short note on the Periodic Table. Explain the significance of groups and periods in the periodic table. ([5])
Explain the Law of Conservation of Mass with an example. ([5])

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