MCQ Questions

Question No. 1

Give one word/term for each of the following descriptions.

Answer :

a) A type of mixture in which particles are uniformly distributed

b) A substance that does not dissolve in water

c) The graph we use to show how soluble a solid is at a specific temperature

d) The physical process we use to soften temporary hard water

e) The water obtained when impure water is boiled and condensed

Question No. 2

The structure of the water molecule is responsible for its unique properties.

Answer :

a) Draw two water molecules by using the ball and stick method (use circles for atoms and lines for bonds)

b) Indicate the following features: its shape, polarity, interatomic bonds and intermolecular forces

c) Explain why water is such a good solvent

d) Name three substances that dissolve in water

e) Name three substances that do not dissolve in water

f) Explain why ice floats on water

Question No. 3

A spoonful of table salt is added to a beaker of water and stirred.

Answer :

a) Name the solute

b) Name the solvent

c) What is this process called

d) Name the resulting liquid

e) Is this a physical or chemical change? Explain your answer

Question No. 4

Look at the two beakers below and answer the questions.

Answer :

a) In which beaker will sugar dissolve the quickest, A or B? Give a reason for your answer

b) Will a saturated solution of sugar contain more solute (sugar) in A or B? Give a reason for your answer

c) Will a saturated solution of table salt contain more solute (salt) in A or B? Give a reason for your answer

d) In which beaker is the substance more soluble: C or D? Give a reason for your answer

Question No. 5

Use the solubility curves below to answer the questions.

Answer :

a) Which compound has the lowest solubility?

b) Which compound becomes less soluble with an increase in temperature?

c) Which compound shows the largest increase in solubility as the temperature increases?

d) How many grams of K2SO4 will dissolve to form a saturated solution at 10 °C?

e) How many grams of NH4Cl will dissolve to form a saturated solution at 44 °C?

f) Will 34 g of KNO3 and 100 g of water at 20 °C form a saturated solution? Explain your answer

Question No. 6

Water treatment plants treat raw water to make it palatable to humans.

Answer :

a) Draw a flow diagram to show all the processes in a standard water treatment plant

b) Name three chemicals that are added during coagulation and give their functions

c) Which process is used to get rid of the floc that forms?

d) Why is activated charcoal sometimes added?

e) Why is it necessary to test the water again before it is stored in reservoirs?

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