Environmental Science 1401

Question 1

1 out of 1.25 points Partial Credit

Expand the following by showing the powers of 10 for each place value.

456 = 4 x 10[a] + 5 x 10[b] + 6 x 10[c] 87.045 = [d] x 101 + [e] x 100 + [f] x 10-1 + [g] x 10[h] + 5 x 10[i] 700 = [j] x 102 + 0 x 101 + 0 x 100

Specified Answer for: a 2
Specified Answer for: b 1
Specified Answer for: c 0
Specified Answer for: d 8
Specified Answer for: e 7
Specified Answer for: f 0
Specified Answer for: g 4
Specified Answer for: h -1
Specified Answer for: i -0
Specified Answer for: j 7
Correct Answers for: a 2
Correct Answers for: b 1
Correct Answers for: c 0
Correct Answers for: d 8
Correct Answers for: e 7
Correct Answers for: f 0
Correct Answers for: g 4
Correct Answers for: h -2
Correct Answers for: i -3
Correct Answers for: j 7
Question 2

1.25 out of 1.25 points Correct

Lake A has a pH of 7 and Lake B a pH of 4. How much less acidic is Lake A compared to Lake B?
Answer
Selected Answer:
1000 times less acidic
Correct Answer:
1000 times less acidic
Question 3

0.3125 out of 1.25 points Partial Credit

Identify the mantissa and exponent for each of the following numbers in scientific notation.

6.4 x 103 : Mantissa = [a]; Exponent = [b] -2.8 x 10-4: Mantissa = [c]; Exponent = [d]

Specified Answer for: a 6
Specified Answer for: b 3
Specified Answer for: c -2
Specified Answer for: d -3
Correct Answers for: a 6.4
Correct Answers for: b 3
Correct Answers for: c -2.8
Correct Answers for: d -4
Question 4

0 out of 1.25 points Incorrect

Write the following in scientific notation; use the Bb system of scientific notation.

5600 = [a] 18.36 x 10-5 = [b] 378,000,000 = [c] 0.0054 = [d] 90251 = [e] 0.000005 = [f]

Specified Answer for: a 5.6x10^3
Specified Answer for: b 0.00018
Specified Answer for: c 3.78x10^8
Specified