Question

1.Take a 10-15 minute walk around your house, yard, neighborhood, etc.

Answer 1

The classification of observed objects in the neighborhood based on the change process (chemical or physical) involved in their formation are;

Chemical

1. Plastic chair
2. Fire
3. Plastic bags
4. Glass
5. Iron rust
6. Cement on plastered wall
7. Exhaust from a moving truck
8. Electric generators engines in operation and becoming hot

Physical

1. Ice
2. Water
3. Cooking gas
4. Fabrics cleaned using detergent powder
5. Wooden furniture
6. Colored clothes
7. Sand
8. Oil used for deep frying

What are the characteristics of chemical and physical change?

The objects observed are;

1. Plastic chair

2. Sand

3. Water

4. Ice

5. Cooking gas

6. Fire

7. Wooden furniture

8. Plastic bags

9. Glass

10. Colored clothes

11. Clothes, cleaned using detergent

12. Rusted iron

13. Plastered wall (with cement)

14. Oil used to deep fry food

15. Truck engines exhaust containing soothe

16. Electricity generators becoming hot after running for a while and producing exhaust gases from liquid fuel

Classification of the above listed items according to the change processes they undergo, (chemical or physical change process), we have;

Items that are formed through a chemical change process includes;

1. Plastic chair

2. Fire

3. Plastic bags

4. Glass

5. Iron rust

6. Cement on plastered wall

7. Exhaust from a moving truck

8. Electric generators engines in operation and becoming hot.

Items that are formed through a physical change process includes.

1. Ice

2. Water

3. Cooking gas

4. Fabrics cleaned using detergent powder

5. Wooden furniture

6. Colored clothes

7. Sand

8. Oil used for deep frying

The classification into objects formed through chemical and physical process is based on the following observable characteristics, including;

Chemical change process characteristics includes;

• Gas formation
• Color characteristics change
• Precipitate formation in the process
• Observable temperature change
• Change in odor

Characteristics of a physical change process includes;

• Reversibility of the observed change
• Lack of liberation of energy, in the form of heat, light, or sound
• The chemicals or materials involved in the process do not change
• The materials involved in the start are the same as those observed after the change. No new substance are formed
• Change in form such as from liquid to solid.

Learn more about chemical and physical change here:

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