What is the mean rate of reaction in the first 20 seconds (in cm3 of hydrogen produced per second)? [1 mark]
А
B
8.4
C
D
84

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.

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.

po-215 i got it right on the quiz