AnswersCR SS Chemistry S2 201819 2026Scientific Notation and Significant Figures

Scientific Notation and Significant Figures Answers

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1
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Which is the correct way to represent 0.0035 kg by using scientific notation?

A
–3.5 103 kg
Option A
B
–3.5 10–3 kg
Option B
C
3.5 10–3 kg
Option C
D
3.5 103 kg
Option D
2
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Which is the correct way to write 602,200,000,000,000,000,000,000 in scientific notation?

A
6022 1019
Option A
B
6022 1020
Option B
C
6.022 1022
Option C
D
6.022 1023
Option D
3

Henry divides 1.060 g by 1.0 mL to find the density of his water sample. How many significant figures should he include in the density value that he reports?

A
one
B
two
C
three
D
four
4

What is the correct way to write 1,550,000,000 in scientific notation?

A
1.55 109
Option A
B
1.55 1010
Option B
C
15.5 108
Option C
D
15.5 109
Option D
5

Andi performs the calculation that is shown below.How should the answer be reported using the correct number of significant figures?

Question illustration
A
3.59
B
3.591
C
3.6
D
4
6

Which number is equal to –906,060?

A
–9.0606 105
Option A
B
–9.06 105
Option B
C
9.06 10–5
Option C
D
9.0606 10–5
Option D
7

Jon performs the following calculation.Which value from his calculation most strongly affects the number of significant figures in the answer?

Question illustration
A
1
B
2.0
C
3.00
D
4.000
8

William adds two values, following the rules for using significant figures in computations. He should write the sum of these two numbers by using

A
the same number of decimal places as the least precise value.
B
the same number of decimal places as the most precise value.
C
a range of the number of significant figures in the two values.
D
an average of the number of significant figures in the two values.
9

Joan writes four numbers on the board in standard form, and then she writes their scientific notation. The table below shows her numbers. Joan’s NumbersRowNumber in standard formNumber in scientific notation17,1007.1 1032–0.000041–4.1 10–53–39,000–3.9 1044120,0001.2 106In which row of the table did Joan make a mistake in writing the scientific notation?

Question illustration
A
1
B
2
C
3
D
4
10

The O–O bond length in oxygen gas is 1.20741 10–10 m. The atomic radius is exactly of the O–O bond length. Which is the atomic radius of oxygen, correctly written in scientific notation with the correct number of significant figures?

Question illustration
A
6 10–11
Option A
B
6.037 10–11
Option B
C
6.03705 10–11
Option C
D
6.04 10–11
Option D
11

What is the correct way to represent 5600 L using scientific notation?

A
–5.6 103 L
Option A
B
–5.6 10–3 L
Option B
C
5.6 10–3 L
Option C
D
5.6 103 L
Option D
12

Joseph divides 8.64 by 2.0. How many significant figures should his answer have?

A
one
B
two
C
three
D
five
13

Why do scientists use scientific notation to represent very small and large numbers?

A
accuracy of measured quantities
B
to simplify the number by using fewer digits
C
number of significant figures
D
precision of measurements
14

How is 6.3 written in scientific notation?

A
6.3 100
Option A
B
63 10–1
Option B
C
6.3 101
Option C
D
63 100
Option D
15

Which of these rules is applicable to subtracting two values that have different numbers of decimal places (for example, subtracting 2.1 from 2.15)?

A
The answer is less accurate than either value.
B
The answer is more precise than either value.
C
The answer has the same number of decimal places as the least precise value.
D
The answer has the same number of significant figures as the most precise value.

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