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Unit O Lab Safety, Measurements, & Scientific Method Flashcards | StudBud
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Unit O Lab Safety, Measurements, & Scientific Method
Unit O Lab Safety, Measurements, & Scientific Method
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Lab safety, metric measurements, and scientific method review
Flashcards
22 cards
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Questions
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Answers
1
When heating a solution in a test tube, a student should
hold the test tube with two fingers
point the test tube in any direction
cork the test tube
wear goggles
2
When in doubt as to how to properly dispose of chemicals used in the lab, you should
always ask your teacher for advice
always rely on your classmates for the correct answer
google the answer on the internet
decide how to dispose of the chemicals on your own
3
To improve the reliability of any results, one should
repeat the experiment using a larger sample size
have no controlled variables in the experiment
test more than one independent variable at a time
revise the hypothesis
4
What is the
independent variable
in the investigation shown?
number of trials
temperature of the water
average heart rate
number of water fleas
5
Which statement about the use of independent variables in controlled experiments is correct?
The independent variables must involve time.
Only one independent is used for each experiment.
The independent variables state the problem being tested.
A different independent variable must be used each time.
6
What is the total length of
all 5 cells
shown in the diagram in micrometers (um)?
100 micrometers
1,000 micrometers
1 micrometer
10 micrometers
7
In a scientific investigation, after the question is defined, the next step is most likely
collecting the data
identifying needed equipment
formulating a hypothesis
designing the experiment
8
Most scientists prefer to see information in a graph rather than in a data table because
is is possible to put more information in a graph
it's easier to see relationships between variables in graphs
only graphs can be used to predict future trends
the information in a graph is more accurate
9
Which statement best describes the relationship between water temperature & average heart rate?
As water temp increases, the avg. heart rate stays constant.
As water temp increases, the avg. heart rate goes up & down.
As the water temp increases, the avg. heart rate decreases.
As water temp increases, the avg. heart rate increases.
10
The first trial of a controlled experiment allows a scientist to isolate and test
a single variable
a logical conclusion
a variety of information
several variables
11
Describe 2
unsafe
lab practices represented in the diagram as shown.
The test tube is unstoppered & student isn't wearing goggles
The flame is too high and the test tube is unstoppered
The opening of the test tube is facing student & no goggles
The beaker has water in it and the flame is under the tripod
12
How does the
control setup
in an experiment different from the other setups in the same exp't?
It differs in the one variable being tested.
It utilizes a different method of data collection.
It tests a different hypothesis.
It has more variables.
13
How much water should be added to the graduated cylinder shown to increase the volume to 15 milliliters?
3 ml
10 ml
11 ml
4 ml
14
What is the volume of water in the graduated cylinder shown below?
14.0 mL
10.3 mL
15.0 mL
13.0 mL
15
To do well on Monday's unit exam, you must
Stay up all night playing X-Box.
Take the Socrative til you get 100% and 3 times after that!
Watch plenty of t.v. tonight & do everything besides science
Pray and hope for the best!
16
What is the approximate
length
of the earthworm shown in the diagram below?
10.6 cm
106 cm
9 mm
90 mm
17
Which activity might help to increase the validity of ANY experiment?
testing more than 1 variable at a time.
having no control group
repeating the experiment several times.
using 2 types of variables in each group.
18
Researchers performing a well-designed experiment should base their conclusions on
a small sample size to insure a reliable outcome
the hypothesis of the experiment
data from repeated trials of the experiment
results predicted before performing the experiment
19
A hypothesis is
NEVER
written in the form of a question and can be defined as
factual evidence.
measurements or observations made during an experiment.
a proposed explanation to a problem.
a summary of events.
20
What is the
dependent variable
in the experiment shown in the graph below?
Percent Maximum Activity of Trypsin
pH
Amount of trypsin
1-10
21
To improve the results shown in the data table below, the student should
conclude that darkness is necessary for seed germination
revise the hypothesis
repeat the experiment using a larger sample size
conclude that light is necessary for seed germination
22
Which statement best describes a scientific theory?
It's an educated guess that can be tested by experiments.
It is a collection of data.
It is a scientific fact that no longer needs evidence.
It's a general statement that's supported by observations.
