Name: ______Score:_____/23
Self Assessment: Experimental Design and Measurement skills
Answer the questions about the following story…
Bart believes that mice who eat the grass outside the power plant will become extra strong (maybe he's been reading too much Radioactive Man). He decides to perform this experiment by letting 10 mice eat grass from outside the power plant. He compared these 10 mice to another 10 mice that had been eating normal grass. His test consisted of a heavy block of wood that blocked the mouse food. He found that the power plant grass eating mice were able to push the block farther away than the regular grass eating mice.
1. ______What is the independent variable?
2.______What is the dependent variable?
3. Name 3 controls.
4. Here is a graph of his data. Is he precise, accurate, both or neither? Explain.
Represents the expected number.
Represents the recorded numbers.
5. Describe what uncertainty is (what is the rule for measuring?)
Report what these read to the proper amount of uncertainty:
How many significant figures?
8. ______45.0780
9. ______20000
10. ______.000320
Calculate the following with correct amount of sig figs in answer.
11. ______45.6 + 77+ 129.00005
12. ______34.7 x .00450
13. ______489.3 – 212.77
40
Convert the following numbers:
14. 750 km = ______cm
15. 1500 mg = ______g
16. 12.77 mL = ______hL
Convert to/from scientific notation
17. ______31,000
18. ______.00005631
19. ______2.9 x 106
20. ______4.57 x 10-4
Calculate the following with correct amount of sig figs in answer.
21. ______2.34 x 10-5 x 8.1 x 10-3
22. ______9 x 1016 + 1.6003 x 1017
23. ______4.50 x 105 / 3.500 x 102
Name: __ANSWER KEY__ Score:_23_/23
Self Assessment: Experimental Design and Measurement skills
Bart believes that mice who eat the grass outside the power plant will become extra strong (maybe he's been reading too much Radioactive Man). He decides to perform this experiment by letting 10 mice eat grass from outside the power plant. He compared these 10 mice to another 10 mice that had been eating normal grass. His test consisted of a heavy block of wood that blocked the mouse food. He found that the power plant grass eating mice were able to push the block farther away than the regular grass eating mice.
1. _Type of grass___ What is the independent variable?(you change it)
2. _____distance block pushed______What is the dependent variable?
(you measure it)
3. Name 3 controls.
Same block of wood, same amount of grass, same
number of mice, same breed of mice, same weather…
4. Here is a graph of his data. Is he precise, accurate, both or neither? Explain.
Represents the expected number.
Represents the recorded numbers.
Neither…accurate means close to
expected answer and
they’re not; precise means close together and they’re not.
5. Describe what uncertainty is (what is the rule for measuring?)
You record all measurements you can tell for sure plus
1 you estimate (are uncertain about)
Report what these read to the proper amount of uncertainty:
How many significant figures?
8. ___6__45.07804,5,7,80 between, 0 at end after
decimal
9. ___1__2000020s are at right but not after
decimal
10. ___3__.0003203,2,00s before 3 are after decimal,
but not toright of #
Calculate the following with correct amount of sig figs in answer.
11. _250_45.6 + 77+ 129.00005 (251.600005, round to least #
sigfigs, which is 2.)
12. _.156_34.7 x .00450(.15615, round to least # sig
figs, which is 3.)
13. _6_ 489.3 – 212.77(6.145111111, round to least
40# sigfigs, which is 1)
Convert the following numbers:k h da b d c m
14. 750 km = 75, 000, 000 cm
15. 1500 mg = 1.5 g
16. 12.77 mL = _.0001277_ hL
Convert to/from scientific notation
17. _3.1 x 104_ 31,000
18. _5.631 x 10-5_.00005631
19. _2, 900, 000_2.9 x 106
20. __.000457__4.57 x 10-4
Calculate the following with correct amount of sig figs in answer.
21. _1.9 x 10-7_ 2.34 x 10-5 x 8.1 x 10-3
22. _3 x 1017_ 9 x 1016 + 1.6003 x 1017
23. __1.29 x 103__ 4.50 x 105 / 3.500 x 102