Which of the following measurement tools has greater measurement uncertainty: a meter stick that measures to the
nearest centimeter (1 cm = 0.01 m) or a ruler that measures to
the nearest millimeter (1 mm = 0.001 m)?

nearest centimeter (1 cm = 0.01 m) or a ruler that measures

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

a electronegativity decreases beacuse the size of nucleus is bigger.