Review Questions for Test - Chapter 3 (answers are below)
1. Put in correct scientific notation
· 2473000
· 0.006520
2. The true value for a measurement is 24.36 m. The experimental value is 20.50 m. Calculate the percent error.
3. A quantity that has both a number and a unit.
4. A measure of how close a series of measurements are to one another.
5. A measure of how close a measurement comes to the actual or true value.
6. The ability to do work or produce heat.
7. The absolute value of the error divided by the accepted value multiplied by 100
8. How many significant figures are in the following measurements?
· 123 m
· 0.07080 m
· 0.00032 g
· 8.7520 x 10-4 mL
9. Perform these calculations to the appropriate number of significant figures
· 8.7 g + 15.43 g + 19 g
· 853.2 L- 627.443 L
· 38.742 kg / 0.421
· 5.40 m x 3.21 m x 1.871 m
10. What are the base SI units for
· time
· temperature
· length
· mass
· amount of substance
11. Make the following conversions:
· 0.44 mL to liters
· 7.86 g to centigrams
· 1.54 kg to grams
12. Find the density of an unknown metal bar with a mass of 57.3 g and a volume of 4.7 cm3
13. What is the temperature in Kelvin?
· 221 oC
· 37 oC
· -34.6 oC
14. The zero point on the Kelvin scale is know as ______.
15. The measure of how hot or cold an object is.
16.Know your metric prefixes –
· cg
· milliliter
· km
· microsecond
17. Correctly rounded, the quotient 2.000 g / 20.0 mL is
/ 0.10 g/mL / / 0.100 g/mL / / 0.1 g/mL / / 0.1000 g/mL18. The number of significant digits in 540.00610 is
/ 8 / / 7 / / 6 / / 5 / / 419. Correctly rounded, the sum of 1.2 x 10-3 cm and 2.7 x 10-4 cm is
/ 0.001 cm / / 0.0015 cm / / 0.002 cm / / 0.00147 cm / / 0.0014 cm20. Rounded correctly, 30.00 g / 10.0 mL =
/ 3.000 g/mL / / 3.00 g/mL / / 3 g/mL / / 3.0 g/mL / / 3.0000 g/mL21. The number of significant digits in 0.077 is
/ 2 / / 4 / / 1 / / 322. How many zeros are significant figures in a measured mass of 0.010010 g?
/ 1 / / 3 / / 0 / / 523. Correctly rounded, the result (23.1000 g - 22.0000 g) / (25.10 mL - 25.00 mL) is
/ 11.000 g/mL / / 11.0 g/mL / / 11 g/mL / / 11.00 g/mL24. The number of significant digits in 4900 is
a. 2 b. 3 c. 4 d. 1
25. A mile is defined as 5280 feet. How many significant figures are in this number?
26. The side of a cube is 5.0 cm and the mass is 250.0 g. Calculate the density.
27. A block of foam has a mass of 10.0 g, a volume of 60.0 cm3, and a length of 30.0 cm.
What is the density of the foam?
28. Two objects, labeled A and B, are the same size. Object A has a density of 1.21 g/cm3. Object B has a density of 1.37 g/cm3. Both are placed in a beaker of water. Which will float higher in the water?
29. A block with a volume of 12 cm3 has a density of 3 g/cm3. The block is cut into two pieces. One piece has a volume of 8 cm3, and the other piece has a volume of 4 cm3. What are the densities of the two pieces?
ANSWERS:
1. 2.473 x 106 , 6.520 x 10-3 (for correct sig figs the zero must be included)
2. 15.8% (in the correct number of sig. figs.)
3. measurement
4. precision
5. accuracy
6. energy
7. percent error
8. 3, 4, 2, 5
9.
· 43 g
· 225.8 L
· 92.0 kg
· 32.4 m3
10.
· second
· Kelvin
· meter
· kilogram
· mole
11.
· 0.00044 L
· 786 cg
· 1540 g
12. 12 g/cm3
13.
· 494 K
· 310 K
· 238.4
14. absolute zero
15. temperature
16. centigram, mL, kilometer, μs
17. 0.100 g/mL
18. 8
19. 0.0015 cm
20. 3.00 g/mL
21. 2
22. 3 (we are only counting the zeros that are significant)
23. 11 g/mL (only 2 sig figs)
24. 2
25. infinite
26. 2.0 g/cm3
27. 0.167 g/cm3 (the length measurement is ill relevant).
28. Neither, both will sink because they are both denser than water.
29. 3 g/cm3 The densities will be the same as the original. Density is an intensive property.