Question

which of the following is an example of a physical change?
choose one option
a sugar and oxygen reacting to produce water and carbon dioxide
b honey dissolving in tea
c a raw egg being cooked
d metal rusting after being left out in the rain

Explanation:

A physical change is a change in which no new substances are formed. Dissolving honey in tea is a physical change as it only changes the state of honey (from solid - like to dissolved in liquid) without forming new chemical substances.
When sugar and oxygen react to produce water and carbon dioxide (Option A), a chemical reaction (combustion, in this case if it's a reaction like respiration or burning of sugar) occurs and new substances are formed.
Cooking a raw egg (Option C) causes denaturation of proteins in the egg, which is a chemical change as the structure of proteins (which are complex molecules) is altered and new molecular arrangements (in the cooked egg) are formed.
Metal rusting (Option D) is a chemical change as metal reacts with oxygen and moisture in the air to form metal oxides (rust), which are new substances.

Answer:

B. honey dissolving in tea