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

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
1000 times less acidic
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]

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]

5.6E+3
3.78E+8
9.0251E+4
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]

.000002222
.00020
0.0002
.0002
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]

5.75E+3
-5.05E+3
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...