Which is an example of a chemical change? a pan of water boils. a candle burns. a teaspoon of salt dissolves. a burner gets red hot

Salt dissolving. The others are changes in temperature,

I am not too sure myself but i know for a fact that a chemical change is a change where something is irreversible or when its a change that get altered in some sort of way. an example is when you put baking soda in vinegar and it turns into gas. 

so i think the closest thing is tea spoon of salt dissolving

Butterfly wingspan is 7.7