Question 1

Pick the change that can be reversed from the following
(a) Cutting of trees
(b) Melting of ghee
(c) Burning of candle
(d) Blooming of flower

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Solution

Melting of ghee is a reversible change because on melting, ghee turns into liquid form and after cooling it returns to its original form. Option (b) is the correct answer.

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Question 4

While lighting a candle, Paheli observed the following changes:
(1) Wax was melting.
(2) Candle was burning.
(3) Size of the candle was reducing
(4) Melted wax was getting solidified.

Of the above, the changes that can be reversed are

Question 1

Which of the following is a physical change?
(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax

Question 8

Look at the figures given below, which show three situations (a) burning candle (b) an extinguished candle (c) melting wax.
Which of these shows a reversible change and why?

Give reason:

(a)Freezing of water to ice and evaporation of water are physical changes.

(b)Burning of a candle is both a physical and a chemical change.

(c)Burning of paper is a chemical change.

(d)Cutting of a cloth piece is a physical change, though it cannot be reversed.

Q. Which of the following are physical changes and which are chemical changes ?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.

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Question 1 Pick the change that can be reversed from the following (a) Cutting of trees (b) Melting of ghee (c) Burning of candle (d) Blooming of flower

Melting of ghee is a reversible change because on melting, ghee turns into liquid form and after cooling it returns to its original form. Option (b) is the correct answer.

Question 1

Pick the change that can be reversed from the following
(a) Cutting of trees
(b) Melting of ghee
(c) Burning of candle
(d) Blooming of flower