EXERCISE 2 - Unit Conversions, Density

Click on the correct answer



1 Convert 3.4 meters to centimeters.
3.4x10-2 cm
3.4x102 cm
3.400x102 cm
3.4x101 cm
None of the previous answers.

2 Convert 4.50 mL to Liters.
4.50x10-3 L
4.50x103 L
4.5x10-3 L
0.045 L
None of the previous answers.

3 Convert 25 mg to grams.
2.5x10-3 g
2.50x10-2 g
2.5x104 g
2.5x103 g
None of the previous answers.

4 Convert 3.00x10-2cm to mm.
3x10-1 mm
3.00x10-3 mm
3.00x10-1 mm
0.3 mm
None of the previous answers.

5 Convert 455 mg to kg.
4.55x106 kg
4.55x10-6 kg
4.55x104 kg
4.55x10-4 kg
None of the previous answers

6 Convert 7.90x10-1km to cm.
7.90x10-6 cm
7.90x104 cm
7.9x104 cm
7.90x105 cm
None of the previous answers

7 Convert 12 cm2 to m2 .
1.2x10-3 m2
1.2x10-1 m2
1.2x105 m2
1.2x103 m2
None of the previous answers.

8 Convert 0.95 m3 to mm.
9.5x102 mm3
9.5x105 mm3
9.5x109 mm3
9.5x108 mm3
None of the previous answers.

9 Convert 4110 mL to cm3.
4.110x103 mL
4.11 mL
4.11x103 mL
4.11x101 mL
None of the previous answers.

10 Convert 0.235 L to mL
2.35x10-4 mL
2.35x103 mL
2.35x10-3 mL
2.35x102 mL
None of the above.

11 Convert 13 mm3 to mL.
1.3x104 mL
1.3x10-2 mL
1.3 mL
1.3x101 mL
None of the previous answers.

12 Convert 0.5000 inches to cm.
1.969x10-1 cm
1.27 cm
1.270 cm
5.08 cm
None of the previous answers.

13 Convert 2.50 g to ounces.
8.82x10-2 oz
8.93x10-2 oz
70.9 oz
11.3 oz
None of the previous answers.

14 Convert 750 mL to gallons.
0.198 ga
0.18 ga
3.2 ga
0.35 ga
None of the previous answers.

15 Convert 1.00 ft3 to gallons.
8.05x10-3 ga
7.48 ga
1.16 ga
6.70 ga
None of the previous answers.

16 Convert 65.00 miles/hr to km/hr.
104 km/hr
40.39 km/hr
100 km/hr
1.046x102 km/hr
None of the previous answers.

17 Sodium chloride melts at 801oC. What is the melting point of sodium on the Kelvin scale?
-528 K
528 K
1074 K
1.07x103 K
None of the previous answers.

18 Helium boils at 4.2 K. What is the boiling point of helium on the Celsius scale?
-269oC
-268.9oC
277.4oC
-277.4oC
None of the previous answers.

19 Convert -40oC to oF
-40oF
-104oF
10oF
-54oF
None of the previous answers.

20 The speed of light is 6.7061x108 miles/hr. What is the speed of light in m/sec?
1.7987x1010 m/sec
2.9979x1010 m/sec
2.9979x108 m/sec
2.0819x106 m/sec
None of the previous answers.

21 The mass of a proton is 1.6726x10-27 kg. What is the mass of the proton in g?
1.6726x10-24 g
1.6726x10-30 g
1.6726x10-25 g
1.6726x10-21 g
None of the previous answers.

22 The mass of an electron is 9.11x10-31 kg. What is the mass of the electron in g?
9.11x10-29 g
9.11x10-25 g
9.11x10-34 g
9.11x10-28 g
None of the previous answers.

23 From the answers to numbers 21 and 22 above, what is the ration of the mass of a proton to the mass of an electron?
1.836x103
5.47x10-4
1.84x103
1
None of the previous answers.

24 6.37 grams of ice at 0oC occupy a volume of 6.95 mL. What is the density of ice at 0oC
1.00 g/mL
0.917 g/mL
1.09 g/mL
9.165468x10-1 g/mL
None of the previous answers.

25 2.50 mL of mercury weighs 34.0 grams at 20oC. What is the density of mercury at 20oC?
7.35x10-2 g/mL
85.0 g/mL
13.6 g/mL
14 g/mL
None of the previous answers.

26 A cylinder of manganese (length 4.00 cm, diameter = 1.00 cm) has a mass of 22.62 g. What is the density of manganese?
1.80 g/cm3
5.66 g/cm3
0.139 g/cm3
7.20 g/cm3
None of the previous answers.

27 An irregular 77.7 g piece of silver is placed into a graduated cylinder that has 15.0 mL of water in it. The new water level is 22.4 mL. What is the density of the silver?
1.0x101 g/cm3
10.5 g/cm3
0.095 g/cm3
3.5 g/cm3
None of the previous answers.

28 26% by mass aqueous sodium chloride is added to a graduate cylinder (mass of cylinder = 85.550 g) to the 35.0 mL mark. The cylinder and contents now weigh 127.445 g. What is the density of the sodium chloride solution?
1.00 g/mL
3.64 g/mL
0.835 g/mL
1.197 g/mL
None of the previous answers.

29 The density of 100% sulfuric acid is 1.83 g/mL. How many mL do you need to provide 75.0 g of sulfuric acid?
137 mL
0.0244 mL
41.0 mL
75.0 mL
None of the previous answers.

30 The density of oxygen gas at 1 atmosphere pressure and 25oC is 1.31 g/L. How many mL do you need of oxygen gas to provide 5.00 g of oxygen gas?
3.82x103 mL
3.82 mL
6.55x103 mL
262 mL
None of the previous answers.

31 Bromine is the only nonmetal that exists as a liquid at room temperature. This dangerous and very toxic substance has a density of 3.12 g/mL. What is the mass of 25.0 mL of bromine?
8.01 g
78.0 g
0.125 g
78 g
None of the previous answers.

32 A spherical container with a diameter of 26.0 cm contains 10.6 g of nitrogen at 1 atmosphere pressure and 25oC. What is the density of the nitrogen gas
0.144 g/L
1.15x10-3 g/L
0.868 g/L
1.15 g/L
None of the previous answers.

33 Very approximately, the density of gases is how many times less than the density of liquids?
0.001
1000
10
100
None of the previous answers.

34 The story of Air Canada Flight 143 (made into a movie as Flight 171) from Montreal to Edmonton on 7/23/83, affords an interesting and relevant example of the importance of unit conversions (P. Banks, Chem. Matters, 10/96, 12-15). A ground crew determied that the flight would require 22,300 kg of fuel for the flight and the tanks contained 7,682 Liters. To calculate how many liters of fuel needed to be added, they used a conversion factor of 1.77 and assumed the units were kg/L. Unfortunateely the conversion factor 1.77 has units of lbs/L. From 1.77 lbs/L, calculate the conversion factor in kg/L. For a map of Canada, see:
http://members.tripod.com/policecars1/canadamap.htm
3.90 kg/L
1.24 kg/L
0.803 kg/L
None of the previous answers.

35 Every time a problem is solved, yhou should ask if the conversion factors used and the answer make sense. The ground crew assumed the density of the fuel to be 1.77kg/L. Consider the density of water and of fuel (are fuels such as gasoline more or less dense than water?). The factor 1.77 kg/L doesn't make sense and the ground crew should have but did not catch their own mistake and loaded the plane with the amount of fuel based on 1.77 kg/L. Calculate the volumes in liters nneeded respectively using the incorrect 1.77 kg/L and the correct value.
4.92x103 L, 2.01x104 L
1.54x104 L, 1.30x104 L
None of the previous answers.

36 Calculate the shortage in liters of gasoline that resulted from the use of 1.77 kg/L instead of the correct value. (Incidentally, thanks to the heroic work of the flight crew and the air controllers, the flight made a safe emergency landing on an abandoned air strip near Winnipeg considerably short of its destination. In this case a tragedy was averted by both a careful response to the problem and luck. However, proper use of conversion factors with appropritate units coupled with some thinking would have avoided the need for the heroics and a chance for tragedy.)
more fuel than needed
1.52x104 L
None of the previous answers.