Chem 103 Module 1 to 6 Exam answers Portage learning LATEST UPDATED 2025 LATEST UPDATED TEST

Chem 103 Module 1 to 6 Exam answers Portage
learning LATEST UPDATED 2025 LATEST UPDATED
TEST


MODULE 1 EXAM
Click this link to access the Periodic Table. This may be helpful throughout the
exam.
1. Convert 845.3 to exponential form and explain your answer.
2. Convert 3.21 x -5 o ordin y form and explain your answer.


Convert 845.3 = than 1 = positive exponent, move decimal 2 places


Convert 3.21 x 10-5 = negative exponent = smaller than 1, move decimal 5 places =
0.0000321

Question 2
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exam.


Using the following information, do the conversions shown below, showing all work:


1 ft = 12 inches 1 = 16 oz 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. 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
Click this link to access the Periodic Table. This may be helpful throughout the
exam.


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
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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
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1. 3.0600 contains ? significant figures.
2. 0.0151 contains ? significant figures.
3. 3.0600 ÷ 0.0151 = ? (give answer to correct number of significant figures)


1. 3.0600 contains 5 significant figures.
2. 0.0151 contains 3 significant figures.
3. 3.0600 ÷ 0.0151 = 202.649 = 203 (to 3 significant figures for 0.0151)


Question 6
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Classify each of the following as an element, compound, solution or
heterogeneous mixture and explain your answer.
1. Coca cola
2. Calcium
3. Chili


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

2. Calcium - is on periodic table = Element

3. Chili - is not on periodic table (not element) - no element names (not
compound)
appears as more than one substance (meat, beans,
sauce) = Hetero Mix


Question 7
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, Classify each of the following as a chemical change or a physical change


1. Charcoal burns
2. Mixing cake batter with water
3. Baking the batter to a cake


1. Charcoal burns - burning always = chemical change
2. Mixing cake batter with water - mixing = physical change
3. Baking the batter to a cake - baking converts batter to new material =
chemical change




Question 8
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exam.


Show the full Nuclear symbol including any + or - charge (n), the atomic number
(y), the mass number (x) and the correct element symbol (Z) for each element
for which the protons, neutrons and electrons are shown - symbol should appear
as follows: xZ +/- n
y




31 protons, 39 neutrons, 28 electrons


31




Question 9
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Name each of the following chemical compounds. Be sure to name all acids as acids
(NOT for instance as binary compounds)


1. PF5
2. Al2(CO3)3
3. H2CrO4