Unit Test — Unit test Answers

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The MSDS for chloroform indicates that it is a clear liquid that has a pleasant smell and substantial vapor pressure. People should avoid inhaling its vapors, and it is sensitive to light. Malik needs 10 mls of chloroform for an experiment. According to this information, how should he safely pour the chloroform?

A
He should locate the chloroform stored in a transparent container in chemical storage and pour directly into his beaker from that location.
B
He should locate the chloroform stored in a transparent container in chemical storage and should take it to the fume hood to pour.
C
He should locate the chloroform stored in a dark container in chemical storage and should take it to the fume hood to pour.
D
He should locate the chloroform stored in a dark container in chemical storage and pour directly into his beaker from that location.
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Heather is doing an acid-base reaction. She has 25.00 mL of hydrochloric acid of unknown concentration in a flask. She wants to add a basic solution to the acid drop by drop, until all the acid has reacted. Which tool would be best for adding the basic solution dropwise and for most precisely measuring the volume of solution added?

A
a graduated cylinder
B
an eye dropper
C
a beaker
D
a buret
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

Sian wants to measure the number of seconds that it takes for the contents of a beaker to change from clear to purple. Which of these tools should she use for this purpose?

A
an electronic balance
B
a stopwatch
C
a barometer
D
a graduated cylinder
25

Which area of chemistry best links the use of titanium and plastics in artificial bone and joint replacements?

A
environmental chemistry
B
materials chemistry
C
agricultural chemistry
D
physical chemistry

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