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WorksheetsPhysical and Chemical Changes
Total questions: 21
Worksheet time: 29mins
Pick the change that can be reversed from the following
Cutting of trees
Melting of ghee
Burning of candle
Blooming of flower
Which of the following change cannot be reversed?
Melting of chocolate
Opening a door
Freezing of ice cream
Hardening of cement
An iron ring is heated. Which of the following statement about it is incorrect?
The ring expands.
The ring almost comes to the same size on cooling.
The change in this case is reversed.
The ring changes its shape and the change cannot be reversed.
While lighting a candle, Athena observed the following changes
(i) Wax was melting.
(ii) Candle was burning.
(iii) Size of the candle was reducing.
(iv) Melted wax was getting solidified.
Of the above, the changes that can be reversed are
(i) and (iv)
(iii) and (iv)
(ii) and (iii)
(i) and (ii)
Salt can be separated from its solution (salt dissolved in water), because
mixing of salt in water is a change that can be reversed by heating and melting of salt.
mixing of salt in water is a change that cannot be reversed.
mixing of salt in water is a permanent change.
mixing of salt in water is a change that can be reversed by evaporation.
Rolling of chapati and baking of chapati are the changes that
cannot be reversed and can be reversed, respectively.
can be reversed and cannot be reversed, respectively.
cannot be reversed.
can be reversed.
Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim
expands and fits onto the wooden wheel.
contracts and fits onto the wooden wheel.
no change in the size takes place.
expands first, then on cooling contracts and fits onto the wooden wheel.
Which of the following is a physical change?
Melting of wax
Burning of candle
Combustion of magnesium ribbon
Rusting of iron
Which of the following is a chemical change?
Twinkling of stars
Cooking of vegetables
Cutting of fruits
Boiling of water
A chemical change may involve
any or all of these changes
evolution of gas only
change in temperature only
change in colour only
Which of the following is/are true when milk changes into curd?
(i) Its state is changed from liquid to semi solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.
Choose the correct option.
(i) and (ii) are correct
(ii) and (iii) are correct
(i), (iii) and (iv) are correct
(i) to (iv) are correct
Zeus painted his main gate made up of iron, to
(i) prevent it from rusting.
(ii) protect it from sun.
(iii) make it look beautiful.
(iv) make it dust free.
Which of the above statement(s) is/are correct?
(i) and (ii)
(ii) and (iii)
only (ii)
(i) and (iii)
Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?
It has not rusted after such a long period.
It was built more than 1600 years ago.
It weighs about 6000 kg.
It is more than 7 metres high.
Galvanisation is a process used to prevent the rusting of which of the following?
Aluminium
Copper
Iron
Zinc
Gwen’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
physical change that can be reversed.
chemical change that can be reversed.
physical change that cannot be reversed.
chemical change that cannot be reversed.
Which of the following statement is incorrect for a chemical reaction?
A gas may be evolved.
A colour change may take place.
Sound may be produced.
Heat may be given out but never absorbed.
To 1 g of copper sulphate powder, a small amount of hot water was added to dissolve it (step I).
On cooling, beautiful blue coloured crystals got separated (step II).
Step I and step II are:
physical and chemical changes respectively.
chemical and physical changes respectively.
both physical changes.
both chemical changes.
Fill in the blanks in the following statements using the words below.
rusted, colourful, substance, chemical, reversible, iron oxide, object, irreversible physical, reversible physical
(a) Making sugar solution is a ____________ change.
(b) A physical change is generally____________.
(c) Grinding of wheat grain changes its size. It is a ____________ change.
(d) Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
(a)
(a)
(b)
(a)
(c)
(a)
(d)
(a)
Give ONE WORD responses to the following
The change in which no new substance is formed is called a __________ change.
The process of heating milk to kill harmful bacteria is called __________.
The change in which iron slowly turns reddish-brown in moist air is called __________.
A solid turning directly into gas without becoming liquid first is called __________.
Match the type of change with its example:
Match the form of energy released with the example of chemical change:
