Changes Around us

Question 1

What are natural changes?

Answer 1

Changes that occur naturally on their own such as changing of day into night and a growth of baby or natural changes.

Question 2

What are man made changes?

Answer 2

Changes that by humans such as cooking of food and boiling of Water or man-made changes.

Question 3

What permanent changes?

Answer 3

Changes that are long-lasting such as rusting of iron and burning of paper are permanent changes.

Question 4

What are temporary changes?

Answer 4

Changes that a short live such as the melting of ice and folding of paper are temporary changes.

Question 5

What is fast changes?

Answer 5

Changes that occur quickly in a short time such as burning of matchstick and bursting of balloons are fast changes.

Question 6

What a slow changes?

Answer 6

A change that occurs slowly over a long period of time such as growth of nails and rusting of iron or slow changes.

Question 7

What is desirable changes?

Answer 7

Changes that we want to take place or desire such as the ripening of fruits and growth of a plant are desirable changes.

Question 8

What are non-desirable changes?

Answer 8

Changes that we do not want to take place as there is no use to us such as rusting of iron and rotting of fruits or undesirable changes.

Question 9

What are periodic changes?

Answer 9

Changes that occur at regular intervals of time such as occurrence of day and night are periodic changes.

Question 10

Non-periodic changes?

Answer 10

Change is that do not occur at regular interval of time such as the occurrence of earthquakes and floods or non-periodic changes.

Question 11

What are reversible changes?

Answer 11

When I change can be reversed it is called reversible changes.
Example: folding of paper And melting of ice.

Question 12

What are irreversible changes?

Answer 12

When I change cannot be reversed it is called it is a irreversible changes.
Example: burning of paper and rusting of iron.

Question 13

What are physical changes?

Answer 13

A change in which no new substance is formed is called a physical change.

Question 14

What are Chemical changes?

Answer 14

When a new substance processing of different properties Is formed after I change it is called a chemical change.

Question 15

Name four types of changes?

Answer 15

Physical change, chemical change, periodic change, non-periodic change, permanent change, temporary change, slow change and fast change and etc.

Question 16

How is the metal rim fixed on a wooden cart wheel?

Answer 16

This is done using the properties of expansion and contraction of metals. The metallic rim is slightly smaller in the diameter than the wooden wheel. On heating the rim expands and easily slides over the wheel. On cooling it contracts and fits tightly onto the wheel.

Question 17

Explain the process of fixing wooden handles in agriculture tools.

Answer 17

Mattocks have a metal ring into which the wooden handles are attached
firmly.When the metal ring is heated it expands and its size increases this allows for inserting the handle enter the ring on cooling the metal ring contracts and holds the handle firmly.

Question 18

Can you bring burnt paper back into its original form? Why?

Answer 18

No because one paper is a is Irreversible change which cannot be turned back into paper it will turn into ashes.

Question 19

Making of ice is a reversible change. Why?

Answer 19

Yes because when ice is melted it turns into water when we freeze water again it turns into ice so melting of ice is a reversible change.

Question 20

What type of change occurs when a matchstick is lighted?

Answer 20

It is a fast change.

Question 21

What is the difference between a reversible and irreversible changes?

Answer 21

Reversible change is when do something can be reversed for example when I smell is in the water when we freeze water again it becomes ice so itis reversible change. Irreversible changes is when something cannot be turned back to its normal state like burning of paper when paper is burned it becomes ashes. Ashes can’t bring back to paper.

Question 22

What is the difference between periodic and non-periodic changes?

Answer 22

Periodic change is a change that occurs during a specific and regular interval of time where as non-periodic change is a change that does not occur repeatedly in a regular interval of time.

Question 23

What is the difference between physical and chemical changes?

Answer 23

Physical change is a change in which no new substance is formed where is chemical change is a change in which new substance possessing different properties is formed.