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Chemistry Conversions

CSUN 100 Lec.                                  Homework # 3

 

  1. Convert 1298.5 g to kilograms.
  2. A) 1.2985 kg B) 12.985 kg C) 129.85 kg
  3. D) .12985 kg E).012985 kg AB) .0012985 kg

 

  1. Convert 2542 mL to liters.
  2. A) .02542 L B) .2542 L C) 2.542 L
  3. D) 25.42 L E) 254.2 L

 

  1. Convert 1.25 x 10-10 m to picometers.

 

  1. A) 125 pm B) 12.5 pm C) 1.25 pm
  2. D) .125 pm E) .0125 pm AB) .00125 pm

 

  1. Convert 45.3 inches to millimeters.

 

  1. A) 115 mm B) 11.5 mm C) 1150 mm
  2. D) 17.8 mm E) 1.78 mm AB) 178 mm
10 mm
=

 

  1. Convert 454 yards to meters.

 

  1. A) 415 m B) 41.5 m C) 4150 m
  2. D) 64.3 m E) 643 m AB) 6430 m

 

  1. On earth, a kilogram has a weight of 2.205 lbs. What mass in grams has a weight of

1 lb?

 

  1. A) 435.5 g B) 453.5 g C) 455.3 g
  2. D) 2205 g E) 220.5 g AB) 22.05 g

 

  1. A marathon runner looses 1.64 lbs of fat during a race. How many grams of fat has this runner lost?

 

  1. A) 744 g B) 74.4 g C) 7440 g
  2. D) 3620 g E) 362 g AB) 36.2 g

 

  1. 1.0 yd2 is how many square feet?

 

  1. A) 6.0 ft2 B) 9.0 ft2 C) 27.0 ft2
  2. D) 0 ft2 E) .33 ft2 AB) 27 ft2

 

  1. 1.00 ft2 is how many square inches?

 

  1. A) 12.0 in2 B) 144 in2 C) 24.0 in2
  2. D) 4 in2 E) 9.00 in2 AB) 12 in2

 

  1. 1.0 yd3 is how many cubic feet?

 

  1. A) 6.0 ft3 B) 9.0 ft3 C) 27.0 ft3
  2. D) 0 ft3 E) .33 ft3 AB) 27 ft3

 

  1. Exactly 1 ft3 is how many cubic inches?

 

  1. A) 12 in3 B) 144 in3 C) 24.0 in3
  2. D) 36 in3 E) 1728 in3 AB) 172.8 in3

 

  1. A gas can holds 5.00 gallons of gas. How many cubic centimeters is this?

 

  1. A) 18900 cm3 B) 21100 cm3 C) 18.9 cm3
  2. D) 211 cm3 E) 1890 cm3 AB) 2110 cm3

 

  1. A new penny has a mass of 2.52 g and a volume of .349 cm3. What is the density of the penny?

 

  1. A) 7.22 g/cm3 B) 2.87 g/cm3 C) .879 g/cm3
  2. D) .138 g/cm3 E) 2.78 g/cm3 AB) .987 g/cm3

 

  1. What is the mass of 2.60 L of white gas if its density is .790 g/cm3?

 

  1. A) 3.39 g B) 2.05 g C) 2050 g
  2. D) 304 g E) 3290 g AB) 3.29 g

 

  1. What is the volume of 5.00 kg of iron if iron’s density is 7.78 g/cm3?

 

  1. A) 12.88 cm3 B) 15600 cm3 C) 156 cm3
  2. D) 2.78 cm3 E) 38900 cm3 AB) 389 cm3
  3. AC) 643 cm3

 

  1. Determine the number of significant figures in the measurement:

0.20200 cm

  1. A) 3 B) 4 C) 5           D) 6           E) 2            AB) exact

 

  1. Determine the number of significant figures in the measurement:

20500 g.

  1. A) 3 B) 4 C) 5           D) 6           E) 2            AB) exact

 

  1. Determine the number of significant figures in the advertisement:

20500 kitties for sale.

  1. A) 3 B) 4 C) 5           D) 6           E) 2            AB) exact

 

  1. Determine the number of significant figures in the requirement:

1050 characters per page

  1. A) 3 B) 4 C) 5           D) 6           E) 2            AB) exact

 

  1. Determine the number of significant figures in the measurement:

205.00 milliliters

  1. A) 3 B) 4 C) 5           D) 6           E) 2            AB) exact

 

  1. Determine the number of significant figures in the measurement:

2050 milliliters

  1. A) 3 B) 4 C) 5           D) 6           E) 2            AB) exact

 

  1. Determine the number of significant figures in the measurement:

0.2050 milliliters

  1. A) 3 B) 4 C) 5            D) 6           E) 2            AB) exact

 

  1. Determine the number of significant figures in the measurement:

.02050 milliliters

  1. A) 3 B) 4 C) 5           D) 6           E) 2            AB) exact

 

  1. Determine the number of significant figures in the measurement:

0.02050 milliliters

  1. A) 3 B) 4 C) 5           D) 6           E) 2            AB) exact

 

  1. What is the proper scientific notation for the measurement .002130 L?
  2. A) 2.130 x 10-3 L B) 2.130 x 103 L C) 2.130 x 10-2 L
  3. D) 2.13 x 10-3 L E) 2.13 x 103 L AB) 2.13 x 10-2 L

 

  1. What is the proper scientific notation for the measurement 2130 L?
  2. A) 2.130 x 10-3 L B) 2.130 x 103 L C) 2.130 x 10-2 L
  3. D) 2.13 x 10-3 L E) 2.13 x 103 L AB) 2.13 x 10-2 L

 

  1. What is the proper scientific notation for the measurement 2130. L?
  2. A) 2.130 x 10-3 L B) 2.130 x 103 L C) 2.130 x 10-2 L
  3. D) 2.13 x 10-3 L E) 2.13 x 103 L AB) 2.13 x 10-2 L

 

Give the answer in the correct number of significant figures for the following calculations:

 

  1. 4.523 cm x 2.56 cm =
  2. A) 11.6 cm2 B) 11.58 cm2 C) 11.6 cm
  3. D) 11.58 cm

 

  1. 4.523 cm/2.56 cm =
  2. A) 1.77 cm B) 1.777 cm C) 1.77
  3. D) 1.777

 

  1. 4.520 cm x 2.50 cm =
  2. A) 11.3 cm B) 11.30 cm C) 11.3 cm2
  3. D) 11.30 cm2 E) 11 cm2                  AB) 11 cm

 

  1. 4.520 cm/2.50 cm =
  2. A) 1.81 cm B) 1.808 cm C) 1.8
  3. D) 1.81 E) 1.81                  AB) 1.808

 

  1. 4.523 cm – 2.56 cm
  2. A) 1.96 cm B) 1.963 cm C) 1.96
  3. D) 1.963 E) 1.96 cm2                  AB) 1.963 cm2

 

  1. 4.520 cm – 2.50 cm =
  2. A) 2.02 cm B) 2.020 cm C) 2.02
  3. D) 2.020 E) 2.02 cm2                 AB) 2.202 cm2

 

  1. How many centiliters are in 3.25 kiloliters?
  2. A) 3.25 x 107 cL B) 3.25 x 103 cL C) 3.25 x 104 cL
  3. D) 3.25 x 106 cL E) 3.25 x 105 cL AB) 3.25 x 108 cL

 

  1. How many kiloliters are 32500. centiliters?
  2. A) 3.25 x 101 kL B) 3.25 x kL C) 3.25 x 10-1 kL
  3. D) 3.25 x 10-2 kL E) 3.25 x 10-4 kL          AB) 3.25 x 102 kL

 

  1. How many meters are 4500. mm?
  2. A) 4.500 m B) 4.50 m C) 45.00 m
  3. D) 45.0 m E) .4500 m           AB) .450 m

 

  1. How many millimeters are 58.50 meters?
  2. A) 5.85 x 104 mm B) 5.850 x 104 mm C) 5.850 x 103 mm
  3. D) 5.85 x 103 mm E) 5.85 x 105 mm                    AB) 5.85 x 105 mm

 

  1. How many meters are 585.0 millimeters?
  2. A) .5850 m B) .585 m C) 5.850 m
  3. D) 5.85 m E) .05850 m        AB) .0585 m

 

1 ounce = 28.3495231 grams.

  1. How many ounces are 54.60 grams?
  2. A) 1.926 oz B) 1.93 oz C) 1550 oz
  3. D) 1548 oz E) .519 oz        AB) .5192 oz

 

  1. How many grams are 54.60 ounces?
  2. A) 1548 g B) 1540 g C) 1.926 g
  3. D) 1.93 g E) .519 g        AB) .5192 g

 

Density of quartz = 2.66 g/cm3

  1. What is the mass of 45.0 cm3 of quartz?
  2. A) 120 g B) 120. g C) 16.9 g
  3. D) .0591 g E) 47.66 g        AB) 17.0 g

 

  1. What is the volume of 45.0 g of quartz?
  2. A) 120 cm3 B) 120. cm3 C) 16.9 cm3
  3. D) .0591 cm3 E) 16.92 cm3        AB) 17.0 cm3

 

  1. What is the mass of 45.0 L of quartz?
  2. A) 1.2 x 105 g B) 1.20 x 105 g C) 1.69 x 104 g
  3. D) 59,100 g E) 1.692 x 1054 g        AB) 1.70 x 104 g

 

  1. What is the volume of 45.0 kg of quartz?
  2. A) 1.2 x 105 cm3 B) 1.20 x 105 cm3 C) 1.69 x 104 cm3
  3. D) 59,100 cm3 E) 1.692 x 104 cm3 AB) 1.70 x 104 cm3

 

  1. 45.00 g of an unknown solid has a volume of 5.60 cm3. What is the numerical value for the density of this material?
  2. A) 252 B) .124 C) 252.0
  3. D) .1244 E) 8.03        AB) 8.034

 

  1. What are the units for the density of the material in question 45.
  2. A) g B) cm3 C) g/cm3
  3. D) cm3/g E) gcm3        AB) 1/ g·cm3

 

  1. 54.50 kg of an unknown solid has a volume of 4.30 L. What is the density of this material?
  2. A) 12.67 g/cm3 B) 12.7 g/cm3 C) 78.9 g/cm3
  3. D) 2.34 g/cm3 E) 234 g/cm3        AB) 58.8 g/cm3
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