Question

7. Give reasons
a. Digestion is a chemical change as well as a physical change
b. Metals are used for making tools​

Answer 1

Answer:

a. Digestion is considered as chemical change because enzymes in the stomach and intestine break down large micro - molecules into to smaller molecules so that the body can absorb the food easily.

b. Metals are used to cook food to make cooking utensils because metals are good conductors of heat and electricity. Since, metal is a good conductor of heat then we can cook food faster where as non metals are bad conductors so they are not used to make utensils.

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