# Environmental Science 1401

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 Answer for: d 5.4x10^-3

Specified Answer for: e 9.2x10^4

Specified Answer for: f 5x10^6

Correct Answers for: a 5.6E3

5.6E+3

Correct Answers for: b 1.836E-4

Correct Answers for: c 3.78E8

3.78E+8

Correct Answers for: d 5.4E-3

Correct Answers for: e 9.0251E4

9.0251E+4

Correct Answers for: f 5E-6

Question 5

0.625 out of 1.25 points

Partial Credit

Convert the following to standard form

2.222 x 10-6 = [a]

6.15E4 = [b]

2.0 x 10-4 = [c]

8.08 x 108 = [d]

Specified Answer for: a 0.000002222

Specified Answer for: b 6.15x10^4

Specified Answer for: c 0.0002

Specified Answer for: d 8.08E-08

Correct Answers for: a 0.000002222

.000002222

Correct Answers for: b 61500

Correct Answers for: c 0.00020

.00020

0.0002

.0002

Correct Answers for: d 808000000

Question 6

0 out of 1.25 points

Incorrect

Perform the following calculations, leave your answers in scientific notation and do not consider significant figures. Use the Blackboard version of scientific notation.

3.5 x 102 + 5.4 x 103 = [a]

3.5 x 102 – 5.4 x 103 = [b]

(8.6 x 10-3)(2.1 x 10-6) = [c]

(8.6 x 10-3)/(2.0 x 10-6) = [d]

Specified Answer for: a 5750

Specified Answer for: b -5050

Specified Answer for: c 1.806E-08

Specified Answer for: d 4095.238

Correct Answers for: a 5.75E3

5.75E+3

Correct Answers for: b -5.05E3

-5.05E+3

Correct Answers for: c 1.806E-8

Correct Answers for: d 1.7E-8

1.7E-8

Question 7

1.25 out of 1.25 points

Correct

Match the correct number of significant figures with the numerals shown Answer

Question Correct Match Selected Match

87.0777

F.

6

F.

6

700

A.

1

A.

1

700.0

D.

4

D.

4

0.00980

C.

3

C.

3

0.002

A.

1

A.

1

0.00909

C.

3

C.

3

Question 8

0.78125 out of 1.25 points

Partial Credit

Perform the following metric conversions. For each conversion indicate which physical...

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