CHEM 103 Chemistry (CHEM103)
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Chem 103 Portage Learning exam 6 | Questions and Answers Graded A+
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Chem 103 Portage Learning exam 6 | Questions and Answers Graded A+ 
 
Chem 103 Portage Learning exam 6 | Questions and Answers Graded A+ 
 
Chem 103 Portage Learning exam 6 | Questions and Answers Graded A+
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Portage Chemistry 103 Module 3 Exam Study - Latest Update 2024
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Portage Chemistry 103 Module 3 Exam Study - Latest Update 2024
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CHEM 103 Lab Exam 8 Questions and Answers | Latest Update 2023/2024 (Portage Learning)
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The unit “m” stands for _______ in this experiment. 
2. (4 points) Why was warming data used for estimating the freezing/melting 
point of the cyclohexane? 
3. (3 points) How much of the cyclohexane solvent was placed in the test? 
1.) molarity 
2.) It is considered reliable. 
It is a dependable predicator of the freezing/melting point of a substnace. 
it can determine the temperatures when the change occurs. 
3.) 10 mL of cyclohexane 
1. molality 
2. Solids tend to supercool, which gives fa...
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CHEM 103 Lab Exam 6 Questions With Answers Latest 2023/2024 (Portage Learning)
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Bonds within a molecule are called intra-molecular bonds. 
Non-polar (type) compounds are insoluble in water. 
intra-molecular Correct! 
Non-polar Correct! 
Question 2 10 / 10 pts 
Fill in the blanks: 
Pentane is insoluble in water because it is a/an nonpolar (type) compound. 
Ethyl alcohol has a boiling point of 76.4 C and n-propyl chloride has a lower 
boiling point of 46.3 C because the Hydrogen bonds holding ethyl alcohol 
together are stronger than the nonpolar bonds which hold n-propyl chl...
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CHEM 103 Lab Exam 3 Questions and Answers Latest 2023/2024 (Portage Learning)
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The sample was coated with carbon in the SEM experiment. 
Answer the following question. 
A 1.1000 gram hydrate sample chosen from Na2CO3∙10H2O, AlCl3∙6H2O, 
MgCl2∙6H2O and BaCl2∙2H2O was heated and found to lose 0.5841 gram of H2O. (1) 
Show the calculation of the % H2O in the unknown hydrate sample. (2) Show the 
calculation of the % H2O in each of the hydrate compounds and identify the unknown 
hydrate from the list. 
Atomic weights: H = 1.008, O = 16.00. MWs: Na2CO3∙10H2O = 286.15,...
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CHEM 103 Lab Exam 2 Questions and Answers | Latest 2023/2024 (Portage Learning)
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A reaction which gives off heat is said to be exothermic . 
Answer 1: 
Answer 2: 
2. A decomposition reaction has more products than reactants. 
exothermic Correct! 
decomposition Correct! 
Question 2 10 / 10 pts 
Answer 1: 
Fill in the blanks: 
The reaction of AgNO with Cu is a single displacement type reaction. 
During the reaction of AgNO with Cu a blue (color) solution and black/gray 
(color) solid are formed. 
3 
3 
single displacement Correct! 
Answer 2: 
Answer 3: 
blue Correct! 
black/gr...
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CHEM 103 Lab Exam 1 Questions With Answers | Latest 2023/2024 (Portage Learning)
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Why is glass so often used as a material for lab containers? 
3. What is the metal device used to hold hot containers? 
4. What is the weighing dish used for solids? 
5. What device is used to smother small fires? 
1.) beaker 
2.) glass is strong combat things like acid and other kinds of harsh stuff. It is 
neutral with most lab chemicals. 
3.) tongs. 
4.) watch glass 
5.) fire blanket . 
1. beaker 
2. Glass is so often used as a material for lab containers because it is 
unreactive with most l...
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CHEM 103 Lab Exam 5 Questions With Answers | Latest Update 2023/2024 (Portage Learning)
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In the Boyle’s law experiment, how was the volume of gas at 
different pressures determined? 
2. (2 points) According to Boyle’s law, as the volume of a gas decreases, the 
pressure _________. 
3. (6 points) A sample of gas occupies a volume of 10.5 L when the pressure 
is 14.3 psi. Use Boyle’s Law to calculate the volume (L) when the pressure is 
decreased to 12.8psi. Show the calculation. 
Answer: 
1. A syringe was used, and the volume was read from the graduation 
markings. 
2. increase...
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CHEM 103 Lab Exam 4 Questions With Answers Latest 2023/2024 (Portage Learning)
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What does it mean that the heat of a reaction is an extensive 
property? 
2. (3 points) Does the following reaction give off heat or absorb heat? 
Explain briefly. 
C D H = +263Kcal/mol 
3. (4 points) In one experiment in the video, room temperature water was 
mixed with water at about 38 degrees. To what temperature (about) did the 
mixture of the two water samples come to after setting for a few minutes? 
Answer: 
1. The heat depends on the amount of substance. If the amount of substance 
is d...
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CHEM 103 Module 3 Exam Questions and Answers | Latest Update 2023-2024 | Portage Learning
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Show the calculation of the heat of reaction (ΔHrxn) for the reaction: 
 2 C2H6 (g) + 5 O2 (g) → 4 CO (g) + 6 H2O (l) 
by using the following thermochemical data: 
ΔHf 
0 C2H6 (g) = -84.0 kJ/mole, ΔHf 
0 CO (g) = -110.5 kJ/mole, ΔHf 
0 H2O (l) = -285.8 
kJ/mole 
Your Answer: 
2 C2H6 (g) + 5 O2 (g) → 4 CO (g) + 6 H2O (l) 
ΔHrxn = ∑ n ΔHf 
0 (products) - ∑ m ΔHf 
0 (reactants) 
ΔHrxn = 4 ΔHf 
0 (CO) + 6 ΔHf 
0 (H2O) - 2 ΔHf 
0 (C2H6 ) - 5 ΔHf 
0 (O2) 
ΔHrxn = 4 (-110.5 kJ/mole...
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