Chemistry
Grade-10
Easy
Question
Which of the following is a chemical change?
- Water freezes to form ice
- Sugar dissolves in water
- Gasoline burns in a car engine
- A piece of metal expands when it is heated
Hint:
Gasoline burns heat is evolved.
The correct answer is: Gasoline burns in a car engine
- Water freezes to form ice is a physical change as states of matter are interconvertible.
- Sugar dissolves in water is a physical change, we can revert back to the starting material.
- Gasoline burns in a car engine is a chemical change as the gasoline is used it forms smoke and heat is produced.
- A piece of metal expands but it remains the same metal, no new substance formed.
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