CHEM 120 – Chamberlain University – 2026/2027 – Introduction to General, Organic & Biological Chemistry Lab Practicum with Verified Questions & Answers

CHEM 120 – Chamberlain University – 2026/2027 – Introduction to General, Organic & Biological Chemistry Lab Practicum with Verified Questions & Answers
Exam 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
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)
(= 1/10)
milli (= 1/1000) centi (= 1/100) deci
CHEM 120 Introduction To General, Organic, And Biological Chemistry With Lab
Question 3
Question 4
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
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
1. Show the calculation of the density of benzene if 28.6 g occupies 32.7 ml.
CHEM 120 Introduction To General, Organic, And Biological Chemistry With Lab
Question 5
Question 6
2. Show the calculation of the volume of 14.3 grams of acetone with density of
0.785 g/ml
1. D = M / V = 28.6 / 32.7 = 0.875
2. V = M / D = 14.3 / 0.785 = 18.2 ml
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)
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
CHEM 120 Introduction To General, Organic, And Biological Chemistry With Lab
Question 7
Question 8
2. Hydrogen iodide - is not on periodic table (not element) - has two element
names = Compound
3. Tea - is not on periodic table (not element) - no element names (not
compound) appears to be one substance = Solution
Classify each of the following as a chemical change or a physical change
1. A silver spoon forms a black tarnish coating
2. Food is digested
3. Rain freezes on a road on a very cold day
1. Silver spoon forms black coating - this is Ag → Ag2S (color change) =
chemical change
2. Food is digested - breakdown of carbs, proteins, fats to new materials =
chemical change
3. Rain freezes on a road on a very cold day - freezing = physical change

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