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1 July, 07:29

Select the equations below that represent physical changes.

Choose one or more:

A.

2 H2O (l) → 2 H2 (g) + O2 (g)

B.

H2O (l) → H2O (s)

C.

CO2 (s) → CO2 (g)

D.

H2 (g) → 2 H (g)

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Answers (1)
  1. 1 July, 10:22
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    Physical changes - any change in the physical properties of the substance is a physical change. Generally physical properties include color, state, size, shape, odour, appearance. In any phyical change, no new substance is formed.

    Chemical changes - any change in the chemical properties of the substance is a chemical change. Chemical properties changes only when something new is formed during a reaction.

    ∴ Part A - 2 H2O (l) → 2 H2 (g) + O2 (g)

    In this, H2 and O2 is produced during the reaction which is different from H20. Thus, it is a chemical change.

    Part B - H2O (l) → H2O (s)

    In this, only the state of water changes from liquid to solid and no new product is formed. Thus, it is a physical change.

    Part C-CO2 (s) → CO2 (g)

    In this also, only the state of CO2 changes from solid to gas and no new product is formed. Thus, it is a physical change.

    Part D-H2 (g) → 2 H (g)

    In this reaction, H2 molecule is dissociated into 2 hydrogen atom leading to formation of new products. Thus, it is a chemical change.

    Finally, equations that represent physical changes are - B and C

    B. H2O (l) → H2O (s)

    C. CO2 (s) → CO2 (g)
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