State the reason for following:
(a) Paint is applied on iron articles.
(b) Foul smell comes from food which gets spoiled.
(c) Tearing of paper is a physical change.
Answers
Answer:
a=prevents corrosion causing water
Answer:
1. In order to prevent the rusting of iron we apply paint on iron articles so that the layer of iron can not come in contact with the environment and do not react with oxygen to form iron oxide and rust is not developed.
2. When food goes bad and starts to become pungent, it is most often due to the growth of spoilage microbes such as bacteria, yeasts and mold. Odors can come from two sources: chemicals that are released from the food as the microbes decompose it, or chemicals produced directly by the microbes themselves.
3. During the physical change neither the chemical composition nor chemical nature of the substance changes. For example:Tearing a paper is a physical change because when the paper is torn only the appearance of paper is changed. ... 3.No new substance is formed.
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