Question

1 State three differences between a physical change and a chemical change.
2 Explain the difference between a physical change and a chemical change
3. In each of the activities listed below state whether the changes that occur are o
or chemical. Explain your answers
(i) An egg boiled for five minutes
(ii) A piece of bread is chewed in the mouth for two minutes
(iii) A piece of meat is chewed in the mouth for two minutes
(iv) A piece of wood is burnt to ashes​

Answer 1

1. 1) A physical change is mostly reversible, while a chemical change mostly tend to be irreversible.

2) In a physical change, no new substance is formed, whereas in a chemical change, an entirely new substance forms.

3) Only physical properties alter in a physical change while in a chemical change, internal properties also get affected.

2. (Same answer as the above one)

3. (i) Physical change, only the egg is boiled, no new substance gets formed.

(ii) Chemical change, saliva mixes with the bread.

(iii) Chemical change, saliva mixes with the meat.

(iv) Chemical change, new substance gets formed, ash and smoke as well.

Mate I am not exactly sure about the 3. ii and iii

Thank you!

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