Question

Which of these is an example of a physical change? a banana ripening in the air hydrogen burning in the air zinc reacting with an acid liquid water turning into vapor

Answer 1

Explanation:

1. physical change
2. chemical change
3. chemical change

Answer 2

To find:

Example of a physical change:

• a banana ripening in the air
• hydrogen burning in the air
• zinc reacting with an acid liquid
• water turning into vapour.

Solution:

Water turning into vapour is an example of physical change as water in liquid is only undergoing a change in the state of matter to vapour state.

Vapourisation of water does not involve any breaking for formation of new chemical bonds.

Hence its a physical reaction.

Other options are eliminated:

• Banana ripening in air is an example of oxidation reaction.

• Hydrogen burning in air is also an example of chemical reaction.

• Zinc reacting with acid is also a chemical reaction.

• All of these are chemical reactions because the involve breaking down of some old bonds and formation of new chemical bonds.

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