AnswersTX-Chemistry AUnit Test

Unit Test — Unit test Answers

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A scientist would most likely need to update her model when it

A
has become too simple.
B
no longer supports the latest results.
C
reduces the need for verbal explanation of data.
D
no longer appears interesting.
22
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What must be part of a quantitative observation?

A
a change of state
B
a change in size
C
a number
D
a color
23

Error bars on four different data points are shown below.Which of these data points is the most reliable?

Question illustration
A
point 1
B
point 2
C
point 3
D
point 4
24

The actual density of iron is 7.874 g/mL. In a laboratory investigation, Jason finds the density of a piece of iron to be 7.921 g/mL. What is the percent error that is associated with Jason’s measurement?

A
-4.7%
B
-0.6%
C
0.6%
D
4.7%
25

How can one determine the median of a data set?

A
by ordering the data points and finding the middle value of the set
B
by ordering the data points and finding the most common value in the set
C
by finding the average of the different values in the set
D
by finding the difference between the highest and lowest values of the set

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