Achange of unit on the ph scale represents a 10-fold change in hydronium ion concentration. how much greater is the hydronium ion concentration in a substance with ph 2 than a substance with ph 5?

a.
3 times
b.
10 times
c.
100 times
d.
1000 times

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This active feature of earth's crust in building mountain ranges as well as islands. this feature is a a) cavern. b) earthquake. c) mountain. d) volcano.

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d