PRIMARY 4

 At the end of the lesson,you should be able to:

1. State the meaning of change.
2. Mention examples of changes in the environment.
3. list the differences between temporary change and permanent change.
4. mention examples of temporary and permanent change                                                                   

Everything around us changes?

Change is when something becomes different.

Things around us are always changing. All things change. Both living and nonliving things change from time to time. Some changes are reversible while some other changes are irreversible. The changes that are reversible are called temporary change while the changes that are irreversible are called permanent change.

Temporary change

Temporary change is when something becomes different for a short period of time before going back to how it used to be. Living and nonliving things can change temporarily.

Temporary change can occur when there is a change in the environment or the position of objects or things.

Examples of Temporary changes

For example, water becomes ice when put in the refrigerator which is usually cold and turns back to water when put in a hot pot.

The animal, chameleon, can also change its color to the color of any environment where it finds itself.

                                                        

(In the pictures above the ice changes to water when placed on the hot stove and it can become ice again when put in a refrigerator)

                                                       

Permanent change

Permanent change is when something becomes different from how it used to be and remains that way without going back to how it used to be.

When things change permanently, they form substances different from their old form.

Examples of permanent changes

For example, a young baby grows into an adult and remains an adult until old age and death.

A tree cut down and made into furniture remains a piece of furniture till infinity unless the furniture spoils.  

                                           

                                          

(When the wood above burns it turns into ashes and remains that way forever)

(When a young chick hatches from an egg it does not go back into the egg)

Unit 3: Differences between temporary and permanent change

As discussed earlier, the changes that happen around us are not the same. Some changes only last for a short period of time while other changes last forever.

Temporary change	Permanent change
The change is for a short period of time	The change stays for ever
New objects formed can go back to their original form	New objects formed cannot go back to their original form
Change is reversible	Change is a irreversible
The environment can cause temporary change	The environment cannot cause permanent change
No new substance is formed	New substances are formed

Now answer the following questions

1. What is change?
2. mention four examples of temporary change.
3. When the day changes into night, what kind of change is it? _____________.
4. list any three differences between temporary change and permanent change.