Question

Write down 10 examples of physical and chemistry changes in our daily life

Answer 1

CHEMICAL CHANCE
rusting of iron

combustion (burning) of wood

metabolism of food in the body

mixing an acid and a base, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH)

cooking an egg

digesting sugar with the amylase in saliva

mixing baking soda and vinegar to produce carbon dioxide gas

baking a cake

electroplating a metal

using a chemical battery



PHYSICAL CHANGE


i. Dissolving of salt in water

ii. Freezing of water into ice

iii. Melting of candle

iv. Evaporation of water

v. Heating nails

vi. Pounding fufu

vii. Dissolving of sugar in wate

melting of ice

Answer 2

Physical changes:

1. Crushing a can

2. Melting of an ice cube

3. Boiling water

4. Mixing sand with water

5. Breaking glass

6. Dissolving sugar in water

7. Shredding paper

8. Chopping wood

9. Mixing different colors of marbles

10. Sublimation of dry ice

Chemical changes:

1. Burning of coal

2. Formation of curd from milk

3. Electrolysis of water

4. Rusting of iron

5. Bursting of crackers

6. Cooking of food

7. Digestion of food

8. Germination of seeds

9. Respiration by living organisms

10. Burning of LPG