Kkampudiaa
16.09.2021 •
Chemistry
V. Answer the following questions :
1. A sharpener loses its sharpening power, if used continuously. Is the loss of sharpening
power a reversible change or an irreversible change?
2. Is ironing of clothes an irreversible change? Give a reason for your answer,
3. Is converting wood into saw dust a reversible change? Give one reason for your answer
4. State three ways by which a change can be brought about
5. Differentiate between a reversible and an irreversible change,
6. How the expansion of metals, which is a reversible change, put to good user Support your
answer by an example.
7. How does the solubility of a substance change with :
(a) rise in temperature
(b) fall in temperature?
8. Why is it difficult to dissolve sugar in ice cold water?
9. You have accidently dropped a glass tumbler, which breaks. Is the change reversible? Give
reason.
10. Give four examples of the change which :
(a) cannot be reversed
(b) can be reversed.
11. A thick coating of plaster of Paris paste is applied on a bandage on a fractured bone. The
paste becomes hard on drying. Can this change be reversed?
12. You have boiled some milk on a hot summer day. On cooling it you forgot to place it in
the fridge. What kind of change will take place in the milk after 12 hours and why?
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Ответ:
The answer to your question is below
Explanation:
1.-
Volume of water from ice = Volume of water plus melted ice - Volume of
warm water.
= 151 ml - 97 ml
= 54 ml
2.-
mass of ice = (1)(54)
= 54 g
3.-
Change in temperature = 0.9°C - 44.6°C
= -43.7°C
4.-
mass of warm water = (1)(97)
= 97 g
5.-
Energy released = (97)(4.184)((43.7)
= 17735.6 Joules
1000 J 1 kJ
17735.6 J x
x = (17735.6 x 1) / 1000
x = 17.7 kJ