Question 1

Add 250.0 mL to 5.00 mL and round off the answer.

Accepted Answer

A)  250 mL
B)  255 mL
C)  255.0 mL
D)  255.00 mL
E)  256 mLF) B) and E)
G) All of the above

Question 2

Subtract 10.0 mL from 45.65 mL and round off the answer.

Accepted Answer

A)  35 mL
B)  35.6 mL
C)  35.65 mL
D)  35.7 mL
E)  36 mLF) B) and E)
G) C) and D)

Question 3

Subtract 6.7 x 10-3 from 6.6 x 10-2 and express the answer in scientific notation.

Accepted Answer

A)  5.9 x 10-1
B)  5.9 x 10-2
C)  5.9 x 10-3
D)  5.9 x 101
E)  5.9 x 102F) A) and E)
G) A) and B)

Question 4

Multiply 1.50 cm by 1.05 cm by 1.00 cm and round off the answer.

Accepted Answer

A)  1.575 cm3
B)  1.58 cm3
C)  1.6 cm3
D)  1.60 cm3
E)  2 cm3F) All of the above
G) A) and E)

Question 5

How many significant digits are in the time measurement 60.010 s?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  none of the aboveF) A) and D)
G) A) and E)

Question 6

Add 5.0 x 104 to 2.0 x 103 and express the answer in scientific notation.

Accepted Answer

A)  1.0 x 103
B)  2.5 x 103
C)  2.5 x 104
D)  5.2 x 103
E)  5.2 x 104F) A) and E)
G) A) and D)

Question 7

Express the exponential number 2.25 x 10-4 as an ordinary number.

Accepted Answer

A)  0.000 225
B)  0.000 022 5
C)  22,500
D)  225,000
E)  none of the aboveF) C) and E)
G) B) and D)

Question 8

Express the exponential number 1.11 x 104 as an ordinary number.

Accepted Answer

A)  0.000 111
B)  0.000 011 1
C)  11,100
D)  111,000
E)  none of the aboveF) A) and B)
G) A) and C)

Question 9

A lithium atom has a radius of 0.000 000 015 2 cm.Express the atomic radius in scientific notation.

Accepted Answer

A)  1.52 x 10-9 cm
B)  1.52 x 10-8 cm
C)  1.52 x 10-7 cm
D)  1.52 x 107 cm
E)  1.52 x 108 cmF) All of the above
G) A) and B)

Question 10

An aluminum atom has a mass of 0.000 000 000 000 000 000 000 0448 g.Express the mass in scientific notation.

Accepted Answer

A)  4.48 x 1023 g
B)  4.48 x 1022 g
C)  4.48 x 10-22 g
D)  4.48 x 10-23 g
E)  4.48 x 10-24 gF) A) and E)
G) C) and D)

Question 11

Round off the following measurement to three significant digits: 19.945 g.

Accepted Answer

A)  19.0 g
B)  19.9 g
C)  19.950 g
D)  19.945 g
E)  20.0 gF) B) and C)
G) A) and E)

Question 12

Multiply 1.05 cm times 2.2 cm and round off the answer.

Accepted Answer

A)  2 cm2
B)  2.0 cm2
C)  2.3 cm2
D)  2.31 cm2
E)  3 cm2F) All of the above
G) A) and B)

Question 13

A carbon atom has a radius of 7.7 x 10-9 cm.Express the atomic radius as an ordinary number.

Accepted Answer

A)  0.000 000 000 077 cm
B)  0.000 000 000 77 cm
C)  0.000 000 007 7 cm
D)  0.000 000 077 cm
E)  0.000 000 77 cmF) C) and D)
G) None of the above

Question 14

How many significant digits are in the mass measurement 20,000 g?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  none of the aboveF) None of the above
G) A) and D)

Question 15

Which of the following is the best estimate for the volume corresponding to 20 drops from an eyedropper?

Accepted Answer

A)  1 mL
B)  10 mL
C)  20 mL
D)  50 mL
E)  100 mLF) B) and E)
G) A) and D)

Question 16

Multiply 2.505 cm by 1.75 cm by 1.0 cm and round off the answer.

Accepted Answer

A)  4 cm3
B)  4.4 cm3
C)  4.38 cm3
D)  4.384 cm3
E)  4.0 cm3F) A) and C)
G) B) and E)

Question 17

Round off the following measurement to three significant digits: 35.35 mL.

Accepted Answer

A)  35.0 mL
B)  35.3 mL
C)  35.30 mL
D)  35.4 mL
E)  35.40 mLF) C) and E)
G) None of the above

Question 18

How many significant digits are in the mass measurement 0.050 g?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  none of the aboveF) B) and D)
G) C) and D)

Question 19

Round off the following measurement to three significant digits: 14,546 cm.

Accepted Answer

A)  145 cm
B)  146 cm
C)  14,500 cm
D)  14,600 cm
E)  15,000 cmF) B) and E)
G) A) and B)

Question 20

Express the exponential number 5.15 x 105 as an ordinary number.

Accepted Answer

A)  0.000 515
B)  0.000 051 5
C)  51,500
D)  515,000
E)  none of the aboveF) B) and E)
G) A) and E)

Exam 21: Interlude: Prerequisite Science Skills

Round off the following measurement to three significant digits: 14,546 cm.

Correct AnswerverifiedShow Answer

Subtract 10.0 mL from 45.65 mL and round off the answer.

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Round off the following measurement to three significant digits: 35.35 mL.

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Round off the following measurement to three significant digits: 19.945 g.

Correct AnswerverifiedShow Answer

An aluminum atom has a mass of 0.000 000 000 000 000 000 000 0448 g.Express the mass in scientific notation.

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Express the exponential number 1.11 x 104 as an ordinary number.

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Add 5.0 x 104 to 2.0 x 103 and express the answer in scientific notation.

Correct AnswerverifiedShow Answer

Which of the following is the best estimate for the volume corresponding to 20 drops from an eyedropper?

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Subtract 6.7 x 10-3 from 6.6 x 10-2 and express the answer in scientific notation.

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A lithium atom has a radius of 0.000 000 015 2 cm.Express the atomic radius in scientific notation.

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Express the exponential number 5.15 x 105 as an ordinary number.

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How many significant digits are in the mass measurement 0.050 g?

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How many significant digits are in the mass measurement 20,000 g?

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Multiply 1.50 cm by 1.05 cm by 1.00 cm and round off the answer.

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Add 250.0 mL to 5.00 mL and round off the answer.

Correct AnswerverifiedShow Answer

How many significant digits are in the time measurement 60.010 s?

Correct AnswerverifiedShow Answer

Express the exponential number 2.25 x 10-4 as an ordinary number.

Correct AnswerverifiedShow Answer

A carbon atom has a radius of 7.7 x 10-9 cm.Express the atomic radius as an ordinary number.

Correct AnswerverifiedShow Answer

Multiply 2.505 cm by 1.75 cm by 1.0 cm and round off the answer.

Correct AnswerverifiedShow Answer

Multiply 1.05 cm times 2.2 cm and round off the answer.

Correct AnswerverifiedShow Answer

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