AnswersTX-Integrated Physics and Chemistry A-CRUnit Test

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A class is using marshmallows to demonstrate different chemicals’ properties by heating and cooling the marshmallows. Which student is practicing bad laboratory safety?

A
Neka is cleaning up the melted marshmallows after recording her observations.
B
Nikkos checks his glassware for imperfections before using them.
C
Kenneth is using the Bunsen burner to roast the marshmallows and eat them.
D
Kojo threw the used marshmallows into the trash can after his instructor told him to do so.
13
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Which is the SI base unit for mass?

A
meter
B
pound
C
gram
D
foot
14

Alpa wants to change 0.54 kilometers into a smaller metric unit. She will have to

A
multiply.
B
divide.
C
add.
D
subtract.
15

Hunter is in lab. He clears a spot on his lab bench to start working. He also puts his lab coat and goggles on. He then identifies where all of the safety equipment is. He notices his station is next to the fume hood, which ventilates the chemicals stored there. The noise of the fume hood was bothersome, so Hunter turned it off.Which could be an error in his set-up?

A
He should not turn off the fume hood.
B
He should wait to put on his coat until after the directions are given.
C
He should wait to put on his goggles until after the directions are given.
D
He should not sit next to the fume hood.
16

Alisha organizes her data about the element lead into a table.Which did Alisha place in the wrong column?

Question illustration
A
Density: 11.34 g/cm3
B
Soft
C
Solid at room temperature
D
Malleable
17

Scientists in a particular field strive for the same quality of work because they know their peers will be reviewing their scientific claims. What does this review process help ensure?

A
standards of the profession
B
publication in scientific journals
C
resistance to new information
D
access to university databases
18

Ingrid wrote the hypothesis below.If the temperature of a liquid increases, the density of the liquid decreases because the particles move farther apart.What are the variables in her hypothesis?

A
The independent variable is the temperature, and the dependent variable is the density.
B
The independent variable is the density, and the dependent variable is the temperature.
C
The independent variable is the temperature, and the dependent variable is the distance between particles.
D
The independent variable is the distance between particles, and the dependent variable is the temperature.
19

Saul converts 2.392 hectoliters to liters. What should his new number be?

A
0.02392
B
0.2392
C
239.2
D
2392
20

Which best describes the purpose of bar graphs?

A
They show changes over a period of time.
B
They compare quantities for particular categories.
C
They show the relationship among parts of a whole.
D
They compare ranges as continuous data.
21

Why is newton's first law of motion considered a law and not a theory?

A
It is an unsupported idea.
B
It is based on multiple observations.
C
It has never been tested.
D
It was validated by a singular experiment.
22

Material safety data sheets are used to give the information about a solvent. The excerpt below is part of an MSDS.

Question illustration
A
fire safety
B
disposal safety
C
chemical use safety
D
glassware safety
23

Which is a scientific claim?

A
At least 75 percent of the class will pass the physical science test today because they studied more than two hours for it.
B
According to the star of the number-one teen TV show, crushed rosemary and olive oil spread over pimples will draw out the bacteria and prevent scarring.
C
Plants fertilized once per week with Super Plant Food Formula have been shown in testing to produce twice as much fruit as plants that are not.
D
Placing half-filled one-gallon jugs of water out on the lawn prevents moles from occupying the space underground.
24

A scientist wants to use a model to help present the results of his detailed scientific investigation. Why would a model be useful?

A
because the model makes the concepts easier to understand
B
because the model is easy to put together and to use
C
because the model prevents other scientists from asking questions
D
because the model requires the audience to pay full attention to it
25

Read the measurement.

Question illustration
A
34 mL
B
38 mL
C
39 mL
D
40 mL

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