Difference between heating and burning and melting of wax

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Solution

In heating a candle it rises the temperature of wax.
In a burning candle, there are both physical and chemical changes.
The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes.

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Q. Burning of wax is achange and melting of wax is achange.

We observe that some portion of wax (in a candle) melts and another portion of it is used in producing heat and light.
Statement A: The melting of wax is a physical change
Statement B: The burning of wax for the production of heat and light is a chemical change.

We observe that some portion of wax (in candle) melts and other portion of it is used in producing heat and light.
Statement A: The melting of wax is a physical change
Statement B: The burning of wax for the production of heat and light is a chemical change.
State which of the statement(s) is/are true.

Q. Classify the following as slow or fast change:
(i) Bearing of heat
(ii) Change of seasons
(iii) Burning of paper
(iv) Weathering of rocks
(v) Melting of wax
(vi) Cooking of food
(vii) Burning of wax
(viii) Melting of ice cream
(ix) Curdling of milk
(x) Formation of day and night.

Which of the following does not involve a chemical reaction ?

(a) digestion of food in our body

(b) process of respiration

(d) melting of candle wax on heating

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Difference between heating and burning and melting of wax

In heating a candle it rises the temperature of wax. In a burning candle, there are both physical and chemical changes. The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes.

In heating a candle it rises the temperature of wax.
In a burning candle, there are both physical and chemical changes.
The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes.