AnswersCrowley Credit Recovery Physics ASafety in Science

Safety in Science — Unit test Answers

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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
2
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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.
3

When an experiment is replicated, how should the results of the two experiments compare?

A
The results of the first experiment should be less accurate.
B
The results of the second experiment should be less accurate.
C
The results of the experiments should be similar.
D
The results of the experiments should be one hundred percent certain.
4

Chris is about to do an experiment to measure the density of water at several temperatures. His teacher has him prepare and sign a safety contract before beginning the experiment. Which item is most likely part of the safety contract?

A
Understand how to deal with water safely in the lab.
B
Bring an electronic copy of the MSDS on a personal laptop.
C
Do not discuss the experiment with other students in the lab.
D
Inspect the glassware for cracks or chips prior to beginning the lab.
5

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.
6

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

A
multiply.
B
divide.
C
add.
D
subtract.
7

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
8

The table shows five items that a person may consider including in a safety contract. Item numberItem1Label all containers.2Tie long hair back.3Bring a cell phone to the lab in case of emergency.4Bring a small laptop computer to the lab to use MSDS online.5Wear safety goggles at all times.Which three of the five items would be best to include in a safety contract?

A
1, 2, and 3
B
1, 2, and 5
C
2, 3, and 4
D
3, 4, and 5
9

Read the measurement.

Question illustration
A
34 mL
B
38 mL
C
39 mL
D
40 mL
10

The table shows results of an experiment that was replicated.

Question illustration
A
They are neither precise nor reproducible.
B
They are precise but not reproducible.
C
They are accurate and reproducible.
D
They are accurate but not reproducible.
11

What is a main reason why the scientific model of atoms is considered a theory rather than a law?

A
It has been proven as a fact.
B
It has been changed over time.
C
It predicts but does not explain.
D
It has stayed the same for a long time.
12

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
13

Which of these steps would most likely be part of a lab procedure?

A
Write a hypothesis to answer a question.
B
Write a title at the top of a completed lab report.
C
Record the time to complete a chemical reaction.
D
Create a question on the cause of a chemical reaction.
14

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.
15

A scientist collected the following data, which show how the pressure of water vapor changes with temperature.Temperature (°C)Pressure (mm Hg)04.5109.62019.1 30 33.24058.75095.6What would a scientist do to best communicate these data to other scientists in a presentation?

A
Replace the table with text highlighting pressures.
B
Change the unit of pressure to atm.
C
Make a graph for better visual representation.
D
Display only rows 1, 3, and 6 of the data to simplify results.
16

Which is the SI base unit for mass?

A
meter
B
pound
C
gram
D
foot
17

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.
18

Miranda gets a small cut on her thumb after she breaks a beaker, and she begins to look around for the lab first aid kit. What important first step should she have taken?

A
She should have first called 911.
B
She should have first informed her whole class.
C
She should have first called a doctor or a nurse.
D
She should have first notified the teacher.
19

Which serves as evidence for a scientific claim?

A
surveys of public opinion
B
company advertisements
C
controlled experiments
D
personal websites
20

Which describes data that is faked or misplaced?

A
reasonable
B
authentic
C
invalid
D
accurate

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