Question

a. Why can not a chemical change be normally reversed? b. Why is it always essential to balance a chemical equation? c. What happens when CO2 gas is passed through lime water and why does it disappear on passing excess CO2? d. Can rusting of iron take place in distilled water?

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Answer 1

a) because two new products are formed like in burning of paper when paper is burnt it forms ash and CO2 and they cannot be bought back

b) because the total no. of reactants must be equal to no. of products . like if we form C+O2=Co2 but if we will not balance it , it will form any other substance like 2Co+02=co which Is highly poisonous gas

c)Co2 passed with lime water =

Co2+CaCo3+H20=Ca(HCO3)2

if we pass in more quantity it reacts with water and so ...

d) yes it can because distilled water absorbs oxygen and promotes rusting

Answer 2

Explanation:

(A) A chemical change be normally reversed because two new products are formed like in burning of paper. when paper is burnt it forms ash and CO2, they cannot be bought back.

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