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3 November, 20:39

Identify all of the following that are chemical changes:

a. leaves turning color in the fall

b. dew forms on a blade of grass

c. ethanol evaporates

d. sugar dissolves in water

e. dry ice sublimes

f. charcoal burning

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Answers (1)
  1. 3 November, 22:52
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    Answer : The correct options are, (a) and (f)

    Explanation:

    Chemical change : It is a change where changes occurs in the chemical composition and thus resulting in the formation of new compound or substance. It is an irreversible reaction.

    The indication of chemical changes are:

    Formation of gas bubbles.

    Formation of precipitate.

    Change in color.

    Change in temperature.

    Change in volume.

    Change in smell or taste.

    Evolution of heat, light and sound.

    Physical change : It is a change in which shape and size of a substance changes. In this there is no change in the chemical composition of the substance and no new substance is forming. It is a reversible reaction.

    The indication of chemical changes are:

    Change in shape.

    Change in form.

    Change in size.

    Change in phase.

    (a) Leaves turning color in the fall : It is a chemical change.

    (b) Dew forms on a blade of grass : It is a physical change because only changes takes place in the phase from vapor phase to liquid phase.

    (c) Ethanol evaporates : It is a physical change because only changes takes place in the phase from liquid phase to vapor phase.

    (d) Sugar dissolves in water : It is a physical change because only changes takes place in the phase from solid phase to liquid phase.

    (e) Dry ice sublimes : It is a physical change because only changes takes place in the phase from solid phase to vapor phase.

    (f) Charcoal burning : It is a chemical change. When charcoal burns, carbon reacts with oxygen to produce carbon dioxide and water as a product.

    Hence, the correct options are, (a) and (f)
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