Iv'e got a long one question one which of these is a chemical property of a substance? a. reactivity b. color c. boiling point d. melting point question two which of these is true of a chemical reaction? a. energy is always released b. energy is always obtained c. energy is either released or absorbed d. energy is not transferred question three which of these is an example of a chemical change? a. leaving cheese out to get moldy (this one prob) b. smelling sprayed perfume c. feeling ice melt on your skin d. crushing ice /w hammer question four which of these is an example of a chemical change? a. exploding fireworks b. grinding powder c. melting cheese d. ironing a shirt question five which of these is an example of a chemical change? a. cutting bread b. spreading peanut butter c. digesting a sandwich (prob this one) d. stirring jelly