Question

Read the given below readings and give correct answer.

1. Classify the following into physical changes and chemical changes.

a) melting of ice
b) heating magnesium in water
c) Silver Bromide kept exposed to sunlight
d) change happening to soda water on opening its bottle.

2. Give an example each for exothermic and endothermic reactions

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Answer 1

Explanation:

(a) Chemical change  (b) Physical change  (c) Chemical change  (d) physical change

Endothermic Reaction Melting ice, evaporation, cooking, gas molecules, photosynthesis are a few examples

Exothermic Reaction Rusting iron, settling, chemical bonds, explosions, nuclear fission are a few examples

Answer 2

1(a) Physical Change

(b) Chemical Change

(c) Chemical Change

(d) Chemical Change

2.In an exothermic reaction the energy is released because the energy of the reactant is greater than the energy of the product. Note : The other examples of endothermic reactions include evaporation, cooking and melting ice. Some examples of exothermic reactions are explosions as in nuclear fissions.

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