Environmental Science 1401

Topics: Measurement, Answer, Significant figures Pages: 13 (1146 words) Published: October 12, 2013
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 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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