Give examples of substances which burn to give a flame. Why do some substances burn without a flame? [3 MARKS]

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Solution

Examples : 1.5 Marks
Reason : 1.5 Marks

Candle, wood and paper are examples of some substances which burn with a flame.
Whether a substance burns along with the evolution of flame depends on the amount and nature of energy released. If the released energy falls in our visible spectrum, we see a flame and when the energy does not fall in the visible spectrum, we do not see the flame.

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