Question 5.

Classify the following changes into fast and slow changes:

Explosion of a cracker, tooth decay, growth of a plant, fading of flowers, burning of cooking gas, taking x-ray photograph of a body part

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Solution

Slow changes: tooth decay, growth of a plant, fading of flowers.

Fast changes: burning of cooking gas, taking x-ray photograph of a body part

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Q. Classify the following as slow or fast change:
(i) Bearing of heat
(ii) Change of seasons
(iii) Burning of paper
(iv) Weathering of rocks
(v) Melting of wax
(vi) Cooking of food
(vii) Burning of wax
(viii) Melting of ice cream
(ix) Curdling of milk
(x) Formation of day and night.

Question 16

Classify the following processes into physical or chemical changes:

(i) Beating of aluminium metal to make aluminium foil.
(ii) Digestion of food.
(iii) Cutting of a log of wood into pieces.
(iv) Burning of crackers.

Classify the following as slow or fast changes: [5 MARKS]

$\begin{matrix} S.No & Changes 1 & Growth of a plant 2 & Formation of a cloud 3 & Formation of sugar solution 4 & Inflation of Tyre 5 & Melting of chocolate \end{matrix}$

Q. Classify the following as slow or fast changes: [5 MARKS]

\begin{matrix} S . N o & C h a n g e s 1 & G r o w t h o f a p l a n t 2 & F o r m a t i o n o f a c l o u d 3 & F o r m a t i o n o f s u g a r s o l u t i o n 4 & I n f l a t i o n o f T y r e 5 & M e l t i n g o f c h o c o l a t e \end{matrix}

Q. Question 11
Which of the following are chemical changes?
a. Growth of a plant
b. Rusting of iron
c. Mixing of iron filings and sand
d. Cooking of food
e. Digestion of food
f. Freezing of water
g. Burning of a candle

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Question 5. Classify the following changes into fast and slow changes: Explosion of a cracker, tooth decay, growth of a plant, fading of flowers, burning of cooking gas, taking x-ray photograph of a body part

Slow changes: tooth decay, growth of a plant, fading of flowers. Fast changes: burning of cooking gas, taking x-ray photograph of a body part

Question 5.

Classify the following changes into fast and slow changes:

Explosion of a cracker, tooth decay, growth of a plant, fading of flowers, burning of cooking gas, taking x-ray photograph of a body part

Slow changes: tooth decay, growth of a plant, fading of flowers.

Fast changes: burning of cooking gas, taking x-ray photograph of a body part