Which of the following sentences represents a physical change? sugar dissolves in coffee iron rusts gasoline burns in an engine a candle burns

The sentence that represents a physical change is sugar dissolves in coffee.
The reason why this is a physical, and not a chemical change is because the sugar completely changed its state - it used to be solid, but then it melted into the coffee and became liquid.
The other options are all chemical changes. 

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.