Science 4-Quarter 1-WEEK 7

Science 4-Quarter 1-WEEK 7

by Aillen Dalapo

​Most Essential Learning Competency

​Identify Changes in materials whether useful or harmful to one’s environment.

LOOKING BACK​

Identify the activities below as to whether they are harmful or useful to one’s environment.​

Multiple Choice

1. Burning of old tires

• Useful Activity

• Harmful Activity

Multiple Choice

2. Smoke belching vehicles

• Useful Activity

• Harmful Activity

Multiple Choice

3. Recycling plastic bottles

• Useful Activity

• Harmful Activity

Multiple Choice

4. Making compost pit

• Useful Activity

• Harmful Activity

Multiple Choice

5. dumping garbage on the street corner

• Useful Activity

• Harmful Activity

Multiple Choice

6. Using eco bag when buying groceries

• Useful Activity

• Harmful Activity

PRETEST​

Choose the letter of the correct answer.

Multiple Choice

1. Change in the size or shape of objects is called _________.

• A. chemical change

• B. freezing

• C. melting

• D. physical change

Multiple Choice

2. Waste from factories that reach bodies of water causes change in the

water environment. Arrange the harmful effects in their proper sequence.

I. Fish die

II. Change in the smell of water

III. Change in the color of water

• A. I, II, III

• B. II, III, I

• C. III, II, I

• D. II, I, III

Multiple Choice

3. Smoke belching vehicles emit gases that cause change in the

composition of air. Which of the following is true about air pollution?

• A. Difficulty in breathing may happen due to harmful gases.

• B. Difficulty in eating due to loss of appetite.

• C. It results in clean rainwater.

• D. No change will happen.

Multiple Choice

4. Household waste may change chemically that may cause harmful effects

to the environment. Which of the following is the harmful effect of improper

disposal of household waste?

• A. Humans may acquire diseases.

• B. Bad odor may come from decayed wastes

• C. The population of pest animals may increase.

• D. The community or surroundings may look unpleasant.

Multiple Choice

5. Which of the following should be practiced, to avoid the harmful effects

of change in materials to the air?

• A. dispose waste properly

• B. check vehicles regularly

• C. take shower in rainwater

• D. store foods in proper temperature

ACTIVITY 1​

Direction: Read carefully. What kind of change happens to the object in each activity? Write PC if it is physical change or CC if it is chemical change.​

Fill in the Blank

1. Chopping of wood

Fill in the Blank

2. Burning of leaves

Fill in the Blank

3. Cutting a piece of cloth

Fill in the Blank

4. Boiling water

Fill in the Blank

5. Rusting of iron

​

​Great work! Physical change happens when the material changes in size and shape without forming a new substance. But other materials may undergo chemical change, meaning a new substance is formed which is different from the original one. Now let us find out the effects of these changes in material to one’s environment.