1.
Which of the following will allow measurement of a liquid’s volume with the greatest precision?
A.
50 mL cylinder graduated in 1 mL increments
B.
100 mL cylinder graduated in 0.5 mL increments
C.
100 mL cylinder graduated in 1 mL increments
D.
200 mL cylinder graduated in 5 mL increments
2.
The chart shows the density of seawater samples collected from the Gulf of Mexico by four different groups. Which group’s data are most precise?
3.
A student performed an analysis of a sample for its calcium content and got the following results:
14.92% 14.91% 14.88% 14.91%
The actual amount of calcium in the sample is 14.90%. What conclusions can you draw about the accuracy and precision of these results?
A.
While precise, these results are not accurate.
B.
While accurate, these results are not accurate.
C.
These results are both accurate and precise.
D.
These results are neither accurate nor precise.
4.
To determine the volume of a cube, a student measured one of the sides of the cube several times. If the true length of the side is 10.62cm, give an example of four sets of measurements that would illustrate the following.
a. imprecise and inaccurate data
5.
To determine the volume of a cube, a student measured one of the sides of the cube several times. If the true length of the side is 10.62cm, give an example of four sets of measurements that would illustrate the following.
b. precise but inaccurate data
6.
To determine the volume of a cube, a student measured one of the sides of the cube several times. If the true length of the side is 10.62cm, give an example of four sets of measurements that would illustrate the following.
c. precise and accurate data
7.
Which tool below is most precise?
Trial
Volume Shown by Graduated Cylinder
Volume Shown by the Buret
1
25 mL
26.54 mL
2
25 mL
26.51 mL
3
25 mL
26.60 mL
4
25 mL
26.49 mL
5
25 mL
26.57 mL
Average
25 mL
26.54 mL
A.
Buret because it has the smallest increments.
B.
Graduated Cylinder because it is closest to the actual answer
C.
Graduated Cylinder because it rounds to a whole number
D.
Buret because it is closest to the actual answer.
8.
A student observes a garden plot. Several plants shaded by a tree are not as large as those of the same species growing in the full sun. The student asks, “Why are the plants growing in the shade smaller than the plants growing in the sun?”
Which is the most reasonable hypothesis to explain the student’s observations?
A.
The tree removes water from the soil. The drier soil limits the growth of those plants growing near the tree.
B.
The tree removes minerals from the soil. The mineral-reduced soil limits the growth of those plants growing near the tree.
C.
The tree blocks sunlight, lowering the light level in the shaded area. This limits the growth of this plant species, which grows best in direct sunlight.
D.
9.
A student needs to collect quantitative data about the pendulum lab. Which of the following is NOT considered quantitative data?
A.
B.
C.
D.
Material used to change mass
10.
In the pendulum lab, it was important that we began by....
A.
B.
C.
Checking precision of testing instruments
D.
Generating a testable question
11.
In our pendulum lab our hypotheses could have arisen from....
12.
Think back to the activity from class: Why is it important that scientists have a "common language" of measurement? Explain in 3-5 sentences, and include at least one example.
13.
Analyze the table and determine which STUDENT (not trial) reported the most precise data.
Trial
Student A Data (Mass in grams)
Student B Data (Mass in grams)
1
4.43
4.43
2
4.45
4.47
3
4.44
4.50
4
4.43
4.53
14.
Which of the following data sets best represents precision, if the accepted value is 3.0920?
15.
Thinking Question- Looking to see your thought process!
Think back to the Pendulum Lab: How could you improve the precision of your data?
16.
Thinking Question- Looking to see your thought process!
Is it possible to be precise but not accurate? If so, how?
17.
Challenge: Using the formula for percent error to solve for accuracy on the problem below:
%Error = V_{actual} – V_{measured} X 100
V_{actual
measured = 77 m actual = 56 m}
(Hint: Since it is a percent, no negative values!)
18.
Challenge: Using the formula for percent error to solve for accuracy on the problem below:
%Error = V_{actual} – V_{measured} X 100
V_{actual
measured = 318 L actual = 321 L}
(Hint: Since it is a percent, no negative values!)