1. 2.9 - REVIEW

2. Temperature: Use these answers for questions 1 – 5
Temperature: Use these answers for questions 1 – 5. Each answer may be used more than once, once, or not at all. Furthermore, a question may have more than one correct answer.
Absolute zero A, I
The boiling point of water F, G,
The freezing point of water B, D, J
The average temperature of the human body K, E,
Room temperature C, H,
-40˚F I,

3. Give the number of significant figures in each measurement:
a g 1
b m
c km 5
d s
e miles 3

4. 7. Calculate each, retaining significance in the answer:
a m x m x 4 m = ____70 m______
b g g g = ____214.8g_____
c L L L = _____480._____
d cm x cm  cm = _____-15.24cm______
12.4 cm

5. 8. Change the following measurements to scientific notation, retaining significance:
a. 3,400 m b L
 3.4 x x 10 -4
c cg d. 1,900,000 kg
x x 106

6. 9. Expand the following measurements:
a x 103 m b x 106 μg  
c x 105 mg d x 102 L

7. Perform the following metric conversions:
a kg = ____234000_ cg b μg = ____.0961_____ mg
c. 1,200. cm = ___12_____ m d km = ____.10_____ m
e mL = _____.650____ L f μm = ___78.00___ Å

8. 11. John and Melissa went into the lab and determined the density of copper to be 9.6 g/mL. They looked up the accepted value and found it was 8.94 g/mL. What is their error, and what is their percentage error?
EA = .7 g/mL
ER = 8 %

9. 12. You mass 2 objects that have accepted masses of 10. 0 g and 1000
12. You mass 2 objects that have accepted masses of 10.0 g and g. Your find your balance is 1.0 g in error for each mass. What is your % error for each measurement?
ER for 10 g object is 10.0%
ER for g object is .1%

10. 13. Do the following temperature conversions:
a. Change 72ºF to ºC b. Change 440ºC to K
 22.2 ºC K
c. Change 256 K to ºC d. Change 675 K to ºF
ºC ºF

11. 14. Use dimensional analysis to change 34.7 cm/s to mile/hour
.776mph

12. 15. Use the factor-label method to change 4.6 gallons/day to mL/s

13. 16. What is the volume of a piece of copper that has a mass of 592 g
16. What is the volume of a piece of copper that has a mass of 592 g? The density of copper is in problem 11.
66.2mL

14. 17. Allison and her partner massed out 17. 25 grams of metal pellets
17. Allison and her partner massed out grams of metal pellets. They placed them in a graduated cylinder containing 23.0 mL of water, and the volume rose to 27.8 mL. What is the density of the metal?
3.6 g/mL

15. 18. Explain the advantages and disadvantages to using a pipet, buret and graduated cylinder.
Pipet - difficult to use but very accurate.
Buret –Calibrated to deliver. Good for multiple samples
Graduated Cylinder – less accurate, difficult “to deliver”