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CHEM 121 Final Exam Questions and Answers- Portage Learning $18.98
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CHEM 121 Final Exam Questions and Answers- Portage Learning
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CHEM 121 Final Exam Questions and Answers- Portage Learning/CHEM 121 Final Exam Questions and Answers- Portage Learning/CHEM 121 Final Exam Questions and Answers- Portage Learning

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  • September 1, 2021
  • 29
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • chem 121 final exam questions and answers portage learningchem 121 final exam questions and answers portage learningchem 121 final exam questions and answers portage learningchem 121 final exam

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Exam 1


Question 1


1. Convert 1005.3 to exponential form and explain your answer.


2. Convert 4.87 x 10-6 to ordinary form and explain your answer.


1. Convert 1005.3 = larger than 1 = positive exponent, move decimal 3 places
= 1.0053 x 103


2. Convert 4.87 x 10-6 =negative exponent =smaller than 1, move decimal 6
places = 0.00000487


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 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


Question 3


Do the conversions shown below, showing all work:


1. 246oK = ? oC


2. 45oC = ? oF


3. 18oF = ? oK


1. 246oK - 273 = -27 oC oK → oC (make smaller) -273


2. 45oC x 1.8 + 32 = 113 oF oC → oF (make larger) x 1.8 + 32


3. 18oF - 32 ÷ 1.8 = -7.8 + 273 = 265.2 oK oF → oC → oK


Question 4


1. Show the calculation of the density of benzene if 28.6 g occupies 32.7 ml.

, 2. Show the calculation of the volume of 14.3 grams of acetone with density of
0.785 g/ml


1. D = M / V = 28..7 = 0.875


2. V = M / D = 14..785 = 18.2 ml


Question 5


1. 1.0780 contains ? significant figures.


2. 5.23 contains ? significant figures.


3. 5.23 x 1.0780 = ? (give answer to correct number of significant figures)


1. 1.0780 contains 5 significant figures


2. 5.23 contains 3 significant figures


3. 5.23 x 1.0780 = 5.63794 = 5.64 (to 3 significant figures for 5.23)


Question 6


Classify each of the following as an element, compound, solution or heterogeneous
mixture and explain your answer.


1. Honey - is not on periodic table (not element) - no element names (not
compound) appears to be one substance = Solution

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