CHEM 103 MODULE 1 EXAM [2025|26] 100% CORRECT
VERIFIED ANSWERS
Question 1
Click this link to access the Periodic Table. This may be helpful throughout the exam.
1. Convert 0.000924 to exponential form and explain your answer.
2. Convert 8.32 x 102 to ordinary form and explain your answer.
1. Convert 0.000924 = smaller than 1 = negative exponent, move decimal 4 places = 9.24 x 10-4
2. Convert 8.32 x 102 = positive exponent = larger than 1, move decimal 2 places = 832
Question 2
Click this link to access the Periodic Table. This may be helpful throughout the exam.
Using the following information, do the conversions shown below, showing all work:
1 ft = 12 inches 1 pound = 16 oz 1 gallon = 4 quarts
1 mile = 5280 feet 1 ton = 2000 pounds 1 quart = 2 pints
kilo (= 1000) milli (= 1/1000) centi (= 1/100) deci (= 1/10)
1. 25.6 mg = ? grams
2. 1.5 gal = ? qts
1. 25.6 mg x 1 g / 1000 mg = 0.0256 grams
2. 1.5 gal x 4 qts / 1 gal = 6.0 qts
https://www.stuvia.com/user/Mboffin
, Question 3 v
Click this link to access the Periodic Table. This may be helpful throughout the exam.
Do the conversions shown below, showing all work:
1. 246oK = ? oC
2. 45oC = ? oF
3. 18oF = ? oK
1. 246oK - 273 = -27 oC o
K → oC (make smaller) -273
2. 45oC x 1.8 + 32 = 113 oF o
C → oF (make larger) x 1.8 + 32
3. 18oF - 32 ÷ 1.8 = -7.8 + 273 = 265.2 oK o
F → oC → oK
Question 4
Click this link to access the Periodic Table. This may be helpful throughout the exam.
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
Click this link to access the Periodic Table. This may be helpful throughout the exam.
1. 0.0756 contains? significant figures.
2. 1.235 contains? significant figures.
3. 0.0756 + 1.235 =? (give answer to correct number of significant figures)
1. 0.0756 contains 3 significant figures
2. 1.235 contains 4 significant figures
3. 0.0756 + 1.235 = 1.3106 = 1.311 (to the thousands place for 1.235)
The last digit should round to a 1
VERIFIED ANSWERS
Question 1
Click this link to access the Periodic Table. This may be helpful throughout the exam.
1. Convert 0.000924 to exponential form and explain your answer.
2. Convert 8.32 x 102 to ordinary form and explain your answer.
1. Convert 0.000924 = smaller than 1 = negative exponent, move decimal 4 places = 9.24 x 10-4
2. Convert 8.32 x 102 = positive exponent = larger than 1, move decimal 2 places = 832
Question 2
Click this link to access the Periodic Table. This may be helpful throughout the exam.
Using the following information, do the conversions shown below, showing all work:
1 ft = 12 inches 1 pound = 16 oz 1 gallon = 4 quarts
1 mile = 5280 feet 1 ton = 2000 pounds 1 quart = 2 pints
kilo (= 1000) milli (= 1/1000) centi (= 1/100) deci (= 1/10)
1. 25.6 mg = ? grams
2. 1.5 gal = ? qts
1. 25.6 mg x 1 g / 1000 mg = 0.0256 grams
2. 1.5 gal x 4 qts / 1 gal = 6.0 qts
https://www.stuvia.com/user/Mboffin
, Question 3 v
Click this link to access the Periodic Table. This may be helpful throughout the exam.
Do the conversions shown below, showing all work:
1. 246oK = ? oC
2. 45oC = ? oF
3. 18oF = ? oK
1. 246oK - 273 = -27 oC o
K → oC (make smaller) -273
2. 45oC x 1.8 + 32 = 113 oF o
C → oF (make larger) x 1.8 + 32
3. 18oF - 32 ÷ 1.8 = -7.8 + 273 = 265.2 oK o
F → oC → oK
Question 4
Click this link to access the Periodic Table. This may be helpful throughout the exam.
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
Click this link to access the Periodic Table. This may be helpful throughout the exam.
1. 0.0756 contains? significant figures.
2. 1.235 contains? significant figures.
3. 0.0756 + 1.235 =? (give answer to correct number of significant figures)
1. 0.0756 contains 3 significant figures
2. 1.235 contains 4 significant figures
3. 0.0756 + 1.235 = 1.3106 = 1.311 (to the thousands place for 1.235)
The last digit should round to a 1
