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

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)

odds are decent that your handwriting right now looks a little bit different than it did five years ago, and will look different again in five more. when i look back through my notebooks from middle school to now, i see a long, slow progression from meticulous and teeny letters to bigger, sloppier ones, plus a few side detours: sometime in high school, for example, i decided those loopy cursive lowercase f’s were just the coolest, adopting them as the lone rep for cursive in my otherwise all-print handwriting.

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