Question

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Answer 1

Answer:

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Answer 2

Answer:

1) During burning of incense stick, some pleasant smelling gases are produced (which go into the air) and ash is left behind. We cannot recombine the gases and the ash to get back the original incense stick. So, this is a change which cannot be reversed. Thus, the burning of an incense stick is an irreversible change.

2) The effects of heat energy are the following: (i) When heat is supplied to a body its temperature rises: When a material body, solid, liquid or gas, is given heat energy, its temperature increases. When this hot body gives out heat energy its temperature decreases.

3) Physical changes are caused by forces like motion, temperature, and pressure. Chemical changes happen on a much smaller level. Most of these changes between molecules are unseen. Factors that affect the rate of chemical changes include: temperature, concentration, surface area, inhibitors, and catalysts.

4) Tire fires are events that involve the combustion of large quantities of tires, typically .

6) (a)burning of wood is a irreversible change.

(b)Cooking food is an Irreversible change.

(c)Ironing of clothes is a Irreversible change.

(d) crumpling of paper is a irreversible changes

Explanation:

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