AnswersMISD CR Chemistry AUnit Test

Unit Test — Unit test Answers

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The MSDS for sodium hydroxide gives it a health rating of 3, a flammability rating of 0, and a reactivity rating of 1. According to the MSDS, which best describes sodium hydroxide?

A
highly corrosive but not highly flammable
B
highly reactive and corrosive
C
highly flammable but not highly corrosive
D
not highly reactive or corrosive
2
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The traits of science and pseudoscience are shown in the table.NumberTrait1Lacks evidence2Supported by evidence3Subjective4Objective5Unresponsive to new information6Continually updatedWhich traits are those of science?

A
2, 3, and 6
B
1, 3, and 5
C
1, 4, and 6
D
2, 4, and 6
3

Which action do researchers take to make advances in science?

A
They guard their findings against the scrutiny of outside sources.
B
They share their experimental results with other researchers.
C
They reduce their participation in working with other scientists.
D
They announce their findings in newspapers to avoid peer review.
4

The accepted value for the density of liquid mercury is 13.5336 g/mL. Four scientists measure the density of liquid mercury in their individual laboratories. The most accurate measurement is made by

A
Dr. Chopra, who measures 13.487 g/mL.
B
Dr. Thompson, who measures 13.5 g/mL.
C
Dr. Smith, who measures 13.54 g/mL.
D
Dr. Tyler, who measures 13.9336 g/mL.
5

What would a chemist most likely study about a car?

A
The amount of rotations of the wheel that occur in 1 mile.
B
The reaction of gasoline combustion in the engine.
C
The accuracy of the speedometer.
D
The strength of the car frame.
6

Yusef adds all of the values in his data set and then divides by the number of values in the set.What is Yusef most likely finding?

A
the percent error
B
the median
C
the standard deviation
D
the mean
7

In what way would a digital thermometer be preferable to those from a liquid-based thermometer?

A
Digital thermometer readings are easier to use when performing calculations.
B
Digital thermometer readings can be more readily combined with computer software.
C
Digital thermometer are inexpensive.
D
Digital thermometer are less prone to fluctuation.
8

Which statement best describes the variables in a controlled experiment?

A
The independent variable is changed to see its effect on the dependent variable while all other conditions are unchanged.
B
The dependent variable is changed to see its effect on the independent variable while all other conditions are unchanged.
C
The independent variable is allowed to change, and the dependent variable is held constant to see what other conditions show a relationship.
D
The dependent variable is allowed to change, and the independent variable is held constant to see what other conditions show a relationship.
9

Rachel is performing an acid-base titration. She hopes to determine the concentration of an unknown acid solution to two decimal places. Which is the best tool to find the volume of the base that she needs to neutralize the acid?

A
beaker
B
Erlenmeyer flask
C
graduated cylinder
D
buret
10

In the human body, a series of chemical reactions results in the making of energy that is used at both the cellular and organismal levels. In which course would a person most likely study these chemical reactions?

A
biochemistry
B
geochemistry
C
materials chemistry
D
physical chemistry
11

The MSDS for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. It reacts with bases, various metals, and strong oxidizing agents. Its vapors can form explosive mixtures with air. Based on this information, which statement is applicable to glacial acetic acid?

A
It should be heated to remove moisture and stored on a lab shelf.
B
It should be handled on a clean, dry area of the lab bench.
C
It should be stored in an iron container, away from open flames.
D
It should be handled in a fume hood, away from open flames.
12

The use of lead paint in houses was banned in 1978 due to the health hazards associated with lead, specifically that high levels of lead exposure is dangerous to humans. Which branch of chemistry would study this?

A
environmental chemistry
B
agricultural chemistry
C
biochemistry
D
both environmental chemistry and biochemistry
13

Which practice poses the greatest safety concern?

A
talking to others in the lab
B
accumulating clutter on the lab bench
C
performing an experiment when sitting down
D
reading the temperature of a water bath
14

What information in the MSDS would be most important to know at the end of an experiment?

A
the boiling point
B
the flammability
C
the disposal procedure
D
the reactivity
15

In an investigation that uses the scientific method, which step immediately follows asking a question?

A
presenting the results
B
making observations
C
creating a hypothesis
D
designing an experiment

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