CHEM 103 MODULE 1 TO 6 EXAM LATEST QUESTIONS & CORRECT ANSWERS PORTAGE LEARNING|COMPLETE AGRADE

Module 1 to 6 Exam answers Portage learning



CHEM 103 MODULE 1 TO 6 EXAM LATEST 2022-2023
QUESTIONS & CORRECT ANSWERS PORTAGE
LEARNING|COMPLETE AGRADE



MODULE 1 EXAM
Question 1
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 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
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
milli (= 1/1000) deci (= centi (=
kilo (= 1000) 1/100) 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

Module 1 to 6 Exam answers Portage learning

,Question 3

, Module 1 to 6 Exam answers Portage learning
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
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. 3.0600 contains ? significant figures.

2. 0.0151 contains ? significant figures.

, Module 1 to 6 Exam answers Portage learning




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
Click this link to access the Periodic Table. This may be helpful throughout the exam.
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
Click this link to access the Periodic Table. This may be helpful throughout the exam.


Classify each of the following as a chemical change or a physical change

1. Charcoal burns

2. Mixing cake batter with water
Baking the batter to a cake