Question

Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?
Topic: Physical and Chemical Changes

Answer 1

mango in the bucket get wilted it is chemical harmful change because it causes the wiltation of other mango

Answer 2

Dear Student,

◆ Harmful changes -

(1) Rusting of iron -

• Rusting of iron is harmful because corrosion decreases durability of copper.
• It can be prevented by mixing iron with carbon, plating with zinc, painting with oil-paint, etc

(2) Rancidity of food -

• Food rancidity is harmful because it alters quality, taste and odour of food.
• It can be prevented proper food packaging, storing in refrigerator, adding food preservatives, etc.

Thanks dear. Hope this is helpful...