Question

describe two changes that are harmful explain why do you consider them harmful how can you prevent them​

Answer 1

Answer:

The two chemical changes which are harmful to us are given below:

1. Rusting on metal objects as it deteriorates the metal surface and decreases the efficiency of it.

2. Rancidity of food items which spoil the foodstuff as it is an oxidation process of food items that spoil the food permanently.

We can prevent these changes by following steps,

1. Rusting can be prevented by painting.

2. Rancidity can be stopped by addition of anti-oxidation like citric acid in food.