Graded Assignment Unit Test, Part 2, chemistry homework help

  

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Graded Assignment
SCI302B: Chemistry | Unit 5 | Lesson 11: Unit Test
Name:
Date:
Graded Assignment
Unit Test, Part 2
Answer the questions below. Unless otherwise instructed, you may use a scientific calculator for this test. When
you have finished, submit this assignment to your teacher by the due date for full credit.
(8 points)
1.
Consider the following reaction occurring in a closed chemical system. Assume that this
reaction is at equilibrium and that in general the reaction to the right is favored.
CH3CH2OH + 3O2
Score
2CO2 + 3H2O ∆H = –1,235 kJ/mol

What type of chemical reaction is this?

If more CH3CH2OH is added to the system, how will the reactions shift to reach equilibrium again?

If water is extracted from the system, how will the reactions shift to reach equilibrium again?

If heat is removed from the system, how will the reactions shift to reach equilibrium again?

What is the name of the principle that helps you predict each of these shifts in equilibrium?
Answer:
(8 points)
2. This graph shows the energy involved in a reaction involving two molecules. Describe what is
happening or what the state of the reaction is at A, B, C, and D. Then tell if this is an
exothermic or an endothermic reaction.
Score
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Copying or distributing without K12’s written consent is prohibited.
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Graded Assignment
SCI302B: Chemistry | Unit 5 | Lesson 11: Unit Test
Answer:
(5 points)
3. Chalcocite is an ore from which copper can be extracted for commercial use. The formula for
this important ore is Cu2S. In the laboratory it is formed by the following reaction:
Score
2Cu + S → Cu2S
The reaction takes place in laboratory conditions that allow the reactant atoms to move freely about in the
reaction vessel. Explain this reaction in terms of collision theory.
Answer:
Your Score
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