Name: Types of Changes
Uploaded: 2019-07-19
Duration: 7 min 1 s
Description: There are different types of changes happening around us, eg., physical and chemical changes. Physical changes can be reversed while the latter cannot. Learn...

Question

Some of our known phenomena are listed below. Write down what kind of phenomenon takes place in each case.

What is happening?	What Kind of phenomenon is it?
What is happening?	Reversible/Irreversible	Natural/Manmade	Physical/Chemical change
a) The unripe fruit of a tree ripens			Physical and chemical
b) Caterpillar turns into butterfly			A very complex set of chemical changes
c) A football is pumped with air
d) A candle is lighted			Physical and chemical
e) Coal is formed from dead remains of plant			Physical and chemical
f) The photograph of a broken bone is taken on an x-ray plat	Irreversible	Man-made	Chemical
g) Curd cheese (channa) is formed from milk			physical and chemical
h) Butter is melted
i) The colour of leaves on tree changing

Accepted Answer

a) The unripe fruit of a tree ripens: It is irreversible and natural. It is a physical and chemical change. The colour and taste changes.

b) Caterpillar turns into a butterfly: It is irreversible and natural. Changes in the shape, look happens. A very complex set of chemical changes takes place. Butterfly flies but not caterpillars.

c) A football is pumped with air: It is reversible and man-made. It becomes round and heavy. It is a physical change.

d) A candle is lighted: It is irreversible and man-made. It is a physical and chemical change.

e) Coal is formed from dead remains of plants: It is irreversible and natural. It takes thousands of years to form coal. It is a physical and chemical change.

f) The photograph of a broken bone is taken on an x-ray plate: It is irreversible and man-made. It is a chemical change

g) Curd cheese (chaana) is formed from milk: It is irreversible and natural. We can not get back the curd again. It is a physical and chemical change.

h) Butter is melted: It is irreversible and man-made. It is a physical change. No new substance is formed on melting.

I) The colour of leaves on the tree changing: Irreversible and natural. It is a chemical change.

What is happening?
What Kind of phenomenon is it?

Reversible/Irreversible Natural/Manmade Physical/Chemical change

a)The unripe fruit of a tree ripens Irreversible Natural Physical and chemical

b) Caterpillar turns into a butterfly Irreversible Natural A very complex set of chemical changes

c) A football is pumped with air Reversible Man-made Physical

d) A candle is lighted irreversible Man-made Physical and chemical

e)Coal is formed from dead remains of plants Irreversible Natural Physical and chemical

f)The photograph of a broken bone is taken on an x-ray plat Irreversible Man-made Chemical

g)Curd cheese (chaana) is formed from milk Irreversible Natural Physical and chemical

h) Butter is melted irreversible Man-made Physical

i) The colour of leaves on tree changing Irreversible Natural Chemical

What happened	Is it possible to return to the previous state?
a) The asphalt on the road melts during summer
b) Raw rice is boiled to make boiled rice
c) Food is digested after being eaten
d)
e)
f)

What incident	Periodic or Non-periodic and why?
1. The rotation of a blade of a ceiling fan or table fan.
2. Cars moving on a road.
3. Falling of tree leaves.

What incident	Periodic or Non-periodic and why?
1. Tide and ebb.
2. A snake shedding its skin.
3, Tsunami.

What incident	Periodic or Non-periodic and why?
1. Leap Year.
2. Waves of a sea.
3. Period in the school for different subjects.

Important Questions on Phenomena Around Us

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