How are physical properties used to describe matter?

What’s the percent by mass of carbon in c10h14n2

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?