Answers26-27 CFISD TX-Chemistry A CRUsing Math to Analyze Data

Using Math to Analyze Data — 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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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.
3

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
4

Which tool can be used to determine the volume of a metal bolt?

A
a beaker
B
a graduated cylinder
C
a meter stick
D
a micrometer
5

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.
6

Henry plans to monitor the change in concentration of an acid during a chemical reaction. He wants to collect data every 0.1 seconds and then to graph his data and insert it into a text document. Which pair of tools would be best for Henry to use?

A
a computer and pH paper
B
pH paper and a graphing calculator
C
a computer and a concentration probe
D
a graphing calculator and a concentration probe
7

Which of the following values is equal to 1 micrometer?

A
0.000001 meter
B
0.001 meter
C
1,000 meter
D
1,000,000 meter
8

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
9

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.
10

Anita is comparing the accepted value for a physical property to the value she measured in the laboratory. Which characteristic of her measured value is Anita most likely trying to evaluate?

A
accuracy
B
mean
C
precision
D
range
11

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
12

Which term best describes the important pieces of information that scientists gather and record during an experiment?

A
conclusions
B
data
C
research
D
supplies
13

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.
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

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.
16

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

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