What is the difference between mass and weight?

Weight is the measure of the amount of force acting on a mass due to acceleration due to gravity.Mass is the scalar quantity and weight is a vector quantity. The unit of mass is kg while the unit of weight is N. Mass can't be changed by changing place, weight can be changed by changing the place.

Explanation:

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

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.