What is the most important reason scientists need an international system of measurement

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.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro