Answered

ii) Classify the following into reversible/ irreversible and physical/ chemical changes. a) Curdling of milk b) Melting of wax c) Lighting a matchstick d) Heating of sugar e) Digesting food f) Dissolving sugar in water g) Burning of petrol in vehicles h) Melting of chocolate for a cake topping



Answer :

Answer:a irreversible, chemical

b reversible, physical

c irreversible, chemical

d reversible, physical

e irreversible, chemical

f irreversible, chemical

g irreversible, chemical

h reversible, physical

Explanation: A chemical reaction has to be irreversible. Because physical changes only means it's state changed. So sugar is still sugar even when heated as it can be crystallized but mixing with water result into a homogenous mixture.

Other Questions