True or false Formation of manure from leaves is a physical change. Iron pipes coated with zinc do not get rusted easily.
Iron and rust are the same substances.
The chemical name of baking soda is Sodium hydrogen carbonate.
Changes in which new substances are formed are called chemical changes
Answers
Required Answers:
1) Formation of manure from leaves is a physical change.
False
Since we can't recover the leaves back from manure because the chemical composition changes completely. New product is forming, and it is a irreversible change. HenCE, it is a Chemical change.
2) Iron pipes coated with zinc do not get rusted easily.
True
Reaction of Iron with water vapour and oxygen in the atmosphere leads to its rusting. This leads to the formation of rust which is also the corroded form of Iron. Hence, we galvanise the Iron or coat with zinc because it protects iron from rusting.
3) Iron and rust are the same substances.
False
Iron and rust are two different chemical compounds because both have different chemical composition. Rust is Iron oxide which is made due to reaction of Iron with oxygen and water vapour.
4) The chemical name of baking soda is Sodium hydrogen carbonate.
True
Yes, Baking soda is known as Sodium hygrogen carbonate chemically. It is formed from washing soda. It is used in baking industry for increasing the crispness and fluffiness of fries and cakes.
5) Changes in which new substances are formed are called chemical changes
True
In the above examples, we already discussed that when new products with new chemical composition are formed, this type of change is known as Chemical change.
And, we are done !!
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Explanation:
1) Formation of manure from leaves is a physical change.
False
Reason: Because it's a chemical change
2) Iron pipes coated with zinc do not get rusted easily.
True
3) Iron and rust are the same substances.
False
Reason: Because both iron and rust are different substances.
4) The chemical name of baking soda is Sodium hydrogen carbonate.
True
5) Changes in which new substances are formed are called chemical changes.
True