Chemistry
Grade-10
Easy
Question
Which of these is an example of a new substance being formed?
- A nail rusting
- A wall being painted
- Water changing to steam
- Paper being folded
Hint:
Chemical changes are permanent or irreversible changes in which a new substance is formed. While the physical changes are temporary changes in which no new substance formation takes place.
The correct answer is: A nail rusting
A nail rusting is a chemical change in which a new substance is formed.
- When iron nail gets exposed to air or moisture, rust formation takes place.
- The rust is nothing but the oxide of iron; which is a new substance formed out of the chemical reaction.
- Such chemical reaction is irreversible.
- Also, the color of the surface of the iron nail also changes.
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