AnswersTX-Chemistry AUnit Test

Scientific Methods Answers

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1
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What must be part of a quantitative observation?

A
a change of state
B
a change in size
C
a number
D
a color
2
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An experiment was conducted to see which metal pot would be better for cooking food quickly. The table below shows how quickly small pieces of wax melted during the experiment. Type of metalTime for the wax to melt (seconds)Aluminum27Bronze45Copper15Steel80The following statement was made after the data were examined: “Copper pots are the best pots for cooking food quickly.” Which term best describes this statement?

A
conclusion
B
hypothesis
C
procedure
D
result
3

A scientist would most likely need to update her model when it

A
has become too simple.
B
no longer supports the latest results.
C
reduces the need for verbal explanation of data.
D
no longer appears interesting.
4

Which best describes the purpose of a controlled experiment?

A
to make sure the results of the experiment support the hypothesis
B
to prevent a dangerous condition resulting from a reaction
C
to examine whether one variable causes a change in another
D
to prevent an undesired change in a variable
5

Which is one way that scientists communicate the results of an experiment?

A
asking a question
B
drawing a picture
C
writing a procedure
D
forming a hypothesis
6

Which best describes the act of using senses or tools to gather information?

A
creating a hypothesis
B
making an observation
C
summarizing the results
D
recording the measurements
7

An experiment was conducted to see which metal pot would be better for cooking food quickly. The table below shows how quickly small pieces of wax melted during the experiment. Type of metalTime for the wax to melt (seconds)Aluminum27Bronze45Copper15Steel80The following statement was made after the data were examined: “Copper pots are the best pots for cooking food quickly.” Which term best describes this statement?

A
conclusion
B
hypothesis
C
procedure
D
result
8

During a conference presentation, a scientist described the materials that she used and how she performed her experiments. Which best explains why a scientist would share these details in a conference?

A
It tells the audience if the results support or contradict the hypothesis.
B
It tells the peers if the study is supported by mathematical models.
C
It informs the peers if the results are supported by other scientists.
D
It informs the audience if the study included controlled tests.
9

A group of scientists have obtained some experimental results. How would the group best find out whether their study is worth more time and resources?

A
by presenting the results in a poster session
B
by submitting results to a librarian for background research
C
by asking another researcher to redo the experiments
D
by requesting advice on science Internet sites
10

What must be part of a quantitative observation?

A
a change of state
B
a change in size
C
a number
D
a color
11

Several scientists from different countries are asked to examine the results of an experiment before a journal will print it. Which term best describes this step of the investigative process?

A
question
B
communication of results
C
peer review
D
experiment control
12

A scientist studies the effect of adding different amounts of salt on the boiling point of water. He places his results in the graph below.What are the independent and dependent variables in this experiment?

Question illustration
A
Mass is the independent variable, and boiling point is the dependent variable.
B
Boiling point is the independent variable, and mass is the dependent variable.
C
There are two independent variables and no dependent variables.
D
There are two dependent variables and no independent variables.
13

Which is an example of making a quantitative observation?

A
measuring the mass of metal used in a reaction
B
recording the color of a solid formed in a reaction
C
describing a liquid as having a slippery feel
D
rating an odor on how nice it smells
14

Read the lab procedure for a controlled experiment that looks at the effect of heat on the circumference of bicycle tires.Step 1: Pump up six identical bike tires to the recommended air pressure.Step 2: Place three tires under heat lamps, and keep the other three tires at room temperature.Step 3: After four hours, measure the circumference of each tire. Step 4: Record your results in the table.Step 5: (?)Which step should be next in this procedure?

A
List the materials that are needed.
B
Write a conclusion for the experiment.
C
Write a hypothesis for the results.
D
Draw a table for the observations.
15

Which best describes the purpose of a control sample?

A
to have more quantitative data to analyze at the end of the experiment
B
to have more qualitative data to analyze at the end of the experiment
C
to compare its results to those of a well-known scientist
D
to compare its results to those with the experimental sample
16

A group of scientists have obtained some experimental results. How would the group best find out whether their study is worth more time and resources?

A
by presenting the results in a poster session
B
by submitting results to a librarian for background research
C
by asking another researcher to redo the experiments
D
by requesting advice on science Internet sites
17

Which method is the typical first step when scientists communicate their scientific results?

A
placing the results on an Internet site to maximize readership
B
distributing the results in press releases to make them well established
C
submitting the results to a scientific journal for a peer review
D
declaring the results in a TV interview for public feedback
18

A scientist would most likely need to update her model when it

A
has become too simple.
B
no longer supports the latest results.
C
reduces the need for verbal explanation of data.
D
no longer appears interesting.
19

Which is one way that scientists communicate the results of an experiment?

A
asking a question
B
drawing a picture
C
writing a procedure
D
forming a hypothesis
20

Which best describes the act of using senses or tools to gather information?

A
creating a hypothesis
B
making an observation
C
summarizing the results
D
recording the measurements

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