Question

what do you think? read the two statements below and decide whether you agree or disagree with them. place an a in the before column if you agree with the statement or a d if you disagree. after youve read this lesson, reread the statements to see if you have changed your mind.

before	statement	after
	4. water can be broken down into simpler substances.

Explanation:

• Statement 3: Reactions do not always require two or more substances. For example, decomposition reactions (e.g., $2H_2O_2

ightarrow 2H_2O + O_2$) start with a single substance breaking down.

• Statement 4: Water ($H_2O$) is a compound. Through electrolysis ($2H_2O

ightarrow 2H_2 + O_2$), it breaks down into hydrogen and oxygen, simpler substances.

Answer:

Statement 3: D
Statement 4: A