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Scientific Notation and Significant Figures Answers

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1
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When a theory is disproved by further evidence, which of the following occurs?

A
It should be considered a failure.
B
It adds to scientific knowledge.
C
It becomes a law.
D
New data must be found to support it.
2
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Which statement correctly compares a law and a theory?

A
A law provides an explanation, while a theory simply describes observations.
B
A law is supported by data, while a theory is merely a guess.
C
Neither a law nor a theory can be proved false.
D
Both a law and a theory can be tested.
3

When may a hypothesis be revised?

A
never
B
after experimental data is collected
C
after it has been proven to be correct
D
after at least one year from when it was first tested
4

Jia observes that adding a solution of sodium hydroxide to a clear liquid turns the liquid pink. She makes a hypothesis about why the liquid changed color. Which characteristic is least important for her hypothesis to have?

A
ability to be tested
B
based on the opinion of her classmates
C
ability to be proven incorrect
D
based on her current knowledge
5

Ava’s best friend has an indoor cat. Ava notices that she sneezes every time that she visits her friend. Ava suspects that she is allergic to cats but is unsure. What is the best thing for Ava to do next?

A
Stop visiting her friend.
B
Conclude that she is allergic to cats, and avoid them completely.
C
Test her suspicion by going to see an allergist to diagnose the allergy.
D
Assume that the sneezing has another cause, and reject her original idea.
6

When scientists say that a theory can never be proven, what are they actually saying?

A
There is no way to test the accuracy of a theory.
B
Theories should not be used to make predictions.
C
Theories do not need to be tested or challenged.
D
It is always possible for new data to contradict a theory.
7

A student is creating a table that compares theories, hypotheses, and laws. TheoryHypothesisLawIs supported by many observations Can be tested Is falsifiable Explains observations In which row should the student enter “No” in the column for Law?

A
Is supported by many observations
B
Can be tested
C
Is falsifiable
D
Explains observations
8

The data from one particular experiment do not agree with a current theory. What is the next step?

A
Discard those data.
B
Change the theory immediately.
C
Repeat the experiment and compare the data again.
D
Change the data to agree with the theory.
9

Eric notices that his flashlight does not turn on when he flips the switch. What is the least appropriate hypothesis for Eric to make?

A
The flashlight does not want to work.
B
The batteries need to be replaced.
C
The light bulb is burned out.
D
The wiring has frayed.
10

Which term is testable, a prediction, and can be supported or refuted by data?

A
hypothesis
B
theory
C
law
D
publication
11

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
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

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
15

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
16

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
17

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
18

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
19

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
20

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.

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