Some changes are listed in the following table- For each change- write in the blank column whether the change can be reversed or not- S- No- 1-c- Change Can be reversed Yes-No 1 - Sawing of a piece of wood - 2 - Melting of ice candy - 3 - Dissolving sugar in water - 4 - Cooking food - 5 - Ripening of a mango - 6 - Souring of milk -

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Standard VII

Chemistry

Reversible and Irreversible Changes

Some changes ...

Question

Some changes are listed in the following table. For each change, write in the blank column whether the change can be reversed or not.

S. No.

Change

Can be reversed (Yes/No)

1.

Sawing of a piece of wood

-

2.

Melting of ice candy

-

3.

Dissolving sugar in water

-

4.

Cooking food

-

5.

Ripening of a mango

-

6.

Souring of milk

-

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Solution

S. No.

Change

Can be reversed (Yes/No)

1.

Sawing of a piece of wood

No

2.

Melting of ice candy

Yes

3.

Dissolving sugar in water

Yes

4.

Cooking food

No

5.

Ripening of a mango

No

6.

Souring of milk

No

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Question 3

Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
$\begin{matrix} S.No. & Change & Can be reversed (Yes/No) 1. & The sawing of a piece of wood 2. & The melting of ice candy 3. & Dissolving sugar in wateer 4. & The cooking of food 5. & The ripening of a mango 6. & Souring of milk \end{matrix}$

Classify these changes into reversible and irreversible. [5 MARKS]

\begin{matrix} S . N o & C h a n g e s 1 & D i s s o l v i n g s a l t i n w a t e r 2 & M e l t i n g i c e c u b e s 3 & R e l e a s e o f s t e a m f r o m p r e s s u r e c o o k e r 4 & R i p e n i n g o f f r u i t s 5 & F r e e z i n g o r a n g e j u i c e b y c o o l i n g \end{matrix}

Classify these changes into physical and chemical changes. [5 MARKS]

$\begin{matrix} S . N o & C h a n g e s 1 & M e l t i n g o f I c e 2 & D i s s o l v i n g s u g a r i n w a t e r 3 & B u r n i n g r u b b e r 4 & B u r n i n g c a m p h o r 5 & M e l t i n g o f w a x \end{matrix}$

Q. Identify the following solutions, whether they are acid or alkali.

Solution	Change in Indicator			Acid/Alkali
	Litmus	Phenolphthalein	Methyl orange
1.	...	No change	...
2.	...	...	Orange colur turns red
3.	Red litmus turns blue	...	...

Q. Match the items is Column A with the items in Column B

Column A	Column B
1. Transparent	(a) Sugar
2. Opaque	(b) Gold
3. Translucent	(c) Wood
4. Lustre	(d) Butter paper
5. Soluble	(e) Window
	(f) Sand

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S. No.	Change	Can be reversed (Yes/No)
1.	Sawing of a piece of wood	-
2.	Melting of ice candy	-
3.	Dissolving sugar in water	-
4.	Cooking food	-
5.	Ripening of a mango	-
6.	Souring of milk	-

S. No.	Change	Can be reversed (Yes/No)
1.	Sawing of a piece of wood	No
2.	Melting of ice candy	Yes
3.	Dissolving sugar in water	Yes
4.	Cooking food	No
5.	Ripening of a mango	No
6.	Souring of milk	No

S. No. Change Can be reversed (Yes/No) 1. Sawing of a piece of wood No 2. Melting of ice candy Yes 3. Dissolving sugar in water Yes 4. Cooking food No 5. Ripening of a mango No 6. Souring of milk No

S. No.

Change

Can be reversed (Yes/No)

1.

Sawing of a piece of wood

No

2.

Melting of ice candy

Yes

3.

Dissolving sugar in water

Yes

4.

Cooking food

No

5.

Ripening of a mango

No

6.

Souring of milk

No