Question

Give 3 conditions from which it can be told primarily whether a change is a chemical change or not
This is a science question, need an answer in 3 or 4 sentences.​

Answer 1

Answer: 3 conditions from which it can be told primarily whether a change is a chemical change or not is 1) change in colour of newly formed object. 2) Its temperature will be changed 3) It will have a different odour than previously one.

Answer 2

Answer:

chemical change:

→New substances formed.

→changes in chemical properties.

e.g.

- rusting of iron

- curdling of milk

- burning of candle.

(wax combines with atmospheric O2 to give CO2)

- combustion of LPG.

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