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CHEM 103 MODULE 1 EXAM Questions and 100% Correct Answers
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CHEM 103 MODULE 1 EXAM Questions and 100% Correct Answers
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CHEM 103MODULE 1 EXAM Questions and 100% Correct
Answers
Question 1
1. Convert 845.3 to exponential form and explain your answer.
2. Convert 3.21 x 10-5 to ordinary form and explain your answer.
1. Convert 845.3 = larger than 1 = positive exponent, move decimal 2 places = 8.453 x
102
2. Convert 3.21 x 10-5 = negative exponent = smaller than 1, move decimal 5 places =
0.0000321
Question 2
Using the following information, do the conversions shown below, showing
all work:
1 ft = 12 inches 1 pound = 16 oz 1 gallon = 4
1 mile = 5280 feet 1 ton = 2000 pounds quarts 1 quart = 2
kilo (= 1000) milli (= 1/1000) pints centi (=
1/100) deci (= 1/10)
1. 24.6 grams = ? kg
2. 6.3 ft = ? inches
1. 24.6 grams x 1 kg / 1000 g = 0.0246 kg
2. 6.3 ft x 12 in / 1 ft = 75.6 inches
please always use the correct units in your final answer
Question 3
, Do the conversions shown below, showing all work:
1. 28oC = ? oK
2. 158oF = ? oC
3. 343oK = ? oF
1. 28oC + 273 = 301 oK o C → oK (make larger)
+273
2. 158oF - 32 ÷ 1.8 = 70 oC o F → oC (make smaller)
-32 ÷1.8
3. 343oK - 273 = 70 oC x 1.8 + 32 = 158 oF o K → oC → oF
Question 4
Be sure to show the correct number of significant figures in each calculation.
1. Show the calculation of the mass of a 18.6 ml sample of freon with
density of 1.49 g/ml
2. Show the calculation of the density of crude oil if 26.3 g occupies 30.5
ml.
1. M = D x V = 1.49 x 18.6 = 27.7 g
2. D = M / V = 26..5 = 0.862 g/ml
Question 5
1. 3.0600 contains ? significant figures.
2. 0.0151 contains ? significant figures.
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