Question

Give reasons:

a. Iron pipes in our homes are galvanized .
b. Respiration is a chemical change .​

Answer 1

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★Iron pipes in our homes are galvanized .

→The iron pipe in our homes galvanized to prevent them for corasion and rust.

★Respiration is a chemical change .

→Respiration is a chemical change as new substances like carbon dioxide and water are formed. Also there is change in the mass as glucose is oxidised by oxygen and heat is released. This change is permanent. All these factors conclude that respiration is a chemical change.

Answer 2

Answer:

Iron pipes in our homes are galvanized .

→The iron pipe in our homes galvanized to prevent them for corasion and rust.

★Respiration is a chemical change .

→Respiration is a chemical change as new substances like carbon dioxide and water are formed. Also there is change in the mass as glucose is oxidised by oxygen and heat is released. This change is permanent. All these factors conclude that respiration is a chemical change.