You and your friend live in different states and plant identical hydrangea bulbs in your garden. when they bloom, you send each other pictures. you notice that even though you bought the exact same kind of plant, your hydrangea flowers are blue and your friend’s are pink! on a hunch, you each measure the ph of your soil and find that your soil is a little acidic and your friend’s is a little basic. why do you think the flowers have different colors?

!

The following is MY answer! You can use it, but please paraphrase it so that it doesn't count for plagiarism!

Explanation:

MY ANSWER: The properties of the soil are different. Because one soil is more basic and the other is more acidic, the different chemicals/ compounds/ properties of the soil make the plants growth different. The reason the flowers have different colors is because the flowers have been grown using different kinds of soil.

The key points they want you to have:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.