1) Which statements are true?
Statement 1: TRUE.
The coefficients in a balanced chemical equation should be the smallest integers possible.
Statement 2: FASLE.
A chemical reaction is written like this:
Statement 3: TRUE.
We use the formulas and the states of the compounds in a chemical reaction.
Statement 4: FALSE.
We cannot change the identity of any compound involved in a chemical reaction. That's why we cannot change the subscripts.
Statement 5: FALSE.
The notation (aq) means aqueous. It means that the compound is dissolved in water.
1 and 3 are TRUE statements.