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Algebra/chemistry: earthquakes

Use the earthquake magnitude scale to answer the question.
1.) how much energy, in joules, is released by an earthquake of magnitude 5?
A) 7.9 x 10(13) joules
B) 2.5 x 10(9)joules
C) 7.9 x 10(11)joules
D) 7.6 x 10(11)joules

2.) how much energy, in joules, is released by an earthquake of magnitude 3.4?
A) 7.9 x 10(13)joules
B) 6.3 x10(7) joules
C) 3.1 x 10(9) joules
D) 3.0 x 10(9) joules

Use the pH scale to answer the question.
3) what is the hydrogen ion concentration of a solution with pH 6.5?
A) 3.2Ã-10 -6
B) 3.2Ã-10 -8
C) 3.2 x 10-7
D) 3.2Ã-10 -9

4) what is the pH of a solution with a hydrogen ion concentration of 0.00001 mole per liter? is this solution an acid or a base?
A) pH=8;base
B) pH=5;acid
C) pH=7;neutral
D) pH=6; acid

Provide an appropriate response.
5) use the 1960s peak annual growth rate of 4% and population of 4 million to predict the current growth rate with a Logistic model?assume a current country population of 9 million. ASsume the carrying capacity is 24 million.
A) 7.80 %
B) 4.50%
C) 3.00%
D) 4.00%

I also need help with problems 6-10 (see attachment)

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Solution Summary

Converting Richter magnitude to Joules.

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