Graded Assignment Name: SCI304B: Honors Chemistry | Unit 5 | Lesson 14: Unit Test 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. (5 points) 1. You watch water falling from the top of a waterfall to the bottom. Determine whether this phenomenon occurs spontaneously. Then characterize the process of moving the water from the bottom of the waterfall to the top in terms of whether it occurs spontaneously. Score Answer: (8 points) 2. Hydrogen is used as a fuel for space ships. In this combustion reaction hydrogen and oxygen combine to form water. The Gibbs energy for this reaction is negative at 773 K. Score a) Define a combustion reaction. (2 points) b) List the Gibbs energy equation and explain what it means. (3 points) c) Determine whether this reaction is spontaneous and explain why. (3 points) Answer: (8 points) 3. Consider the following reaction, which is carried out at 300 K: Score CH3CH2OH + 3O2 → 2CO2 + 3H2O ∆H = –1,235 kJ/mol and ∆S = +0.22kJ/mol•K • What is the value of ∆G? Show your work. • Classify the reaction as spontaneous or nonspontaneous. • Suggest why the value for ∆S is positive in this reaction. Answer: © 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 1 of 3 Graded Assignment SCI304B: Honors Chemistry | Unit 5 | Lesson 14: Unit Test (8 points) 4. 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 2CO2 + 3H2O Score ∆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: (5 points) 5. This graph shows the energy changes during the progress of a reaction involving two molecules. Explain what is happening or what the state of the reaction is at A, B, C, and D. Is this an exothermic or an endothermic reaction? Score Answer: © 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 2 of 3 Graded Assignment SCI304B: Honors Chemistry | Unit 5 | Lesson 14: Unit Test (5 points) 6. 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 © 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 39 Page 3 of 3 ` Question 1 Complete 5 points Use your knowledge of spontaneous reactions. Answer all parts of the question and write in a complete paragraph. Sufficient 4 points Answer all parts of the question and write in a complete paragraph. Partial 3 points Answer all parts of the question and write in a complete paragraph. Falls Below 2 points Answer all parts of the question and write in a complete paragraph. Missing 0 points Answer all parts of the question and write in a complete paragraph. ` Complete 8 points Sufficient 6 points Partial 4 points Falls Below 2 points Missing 0 points Question 2 Explain Gibbs Free energy and use it to determine whether or not a reaction is spontaneous. Make sure to answer all parts of the question and write in a compete paragraph. Make sure to answer all parts of the question and write in a compete paragraph. Make sure to answer all parts of the question and write in a compete paragraph. Make sure to answer all parts of the question and write in a compete paragraph. Make sure to answer all parts of the question and write in a compete paragraph. ` Complete 8 points Sufficient 6 points Partial 4 points Falls Below 2 points Missing 0 points Question 3 Calculate using Gibbs free energy equation. Make sure to answer all parts of the question and show your work. Make sure to Make sure to Make sure to Make sure to answer answer all parts of answer all parts of answer all parts of all parts of the the question the question the question question and show and show your work. and show your work. and show your work. your work. ` Complete 8 points Sufficient 6 points Partial 4 points Falls Below 2 points Missing 0 points Question 4 Chemical Equilibrium using Le Chatelier's Principles. Make sure to answer all parts of the question and write in a complete paragraph. Make sure to answer all parts of the question and write in a complete paragraph Make sure to answer all parts of the question and write in a complete paragraph Make sure to answer all parts of the question and write in a complete paragraph Make sure to answer all parts of the question and write in a complete paragraph ` Complete 5 points Sufficient 4 points Partial 3 points Falls Below 2 points Missing 0 points Question 5 Interpret the graph of the progress of reactions. Make sure to answer all parts of the question. Make sure to answer all parts of the question. Make sure to answer all parts of the question. Make sure to answer all parts of the question. Make sure to answer all parts of the question. ` Question 6 Overall Score Complete 5 points Sufficient 4 points Explain the collision theory. Write in a complete paragraph using the ELA rubric Write in a complete to guide your writing paragraph. - purpose, elaboration, evidence, language, and conventions. 100% 39 or more Grade A 35 or more Partial 3 points Write in a complete paragraph. Grade B 31 or more Falls Below 2 points Write in a complete paragraph. Grade C 27 or more Missing 0 points Write in a complete paragraph. Grade D 23 or more Grade F 0 or more ` Purpose Exceeds 0.2 points Meets 0.16 points The response exhibits thorough, accurate understanding and interpretation of controlling idea. The response exhibits acceptable understanding and interpretation of the controlling idea. The response doesn’t The response exhibits address the controlling limited understanding idea, demonstrating and interpretation of misunderstanding of the the controlling idea. controlling idea. This response does not meet unit objectives for purpose. The response addresses most aspects of the prompt, however one part of the answer may not be fully developed, showing limited understanding of the topic and text. The response addresses some aspects of the prompt, but leaving significant parts to be underdeveloped. Response demonstrates very limited understanding of the topic and text. The response does not address the prompt. Significant parts are underdeveloped and demonstrate unfamiliarity with the text This response does not meet unit objectives for elaboration. The response provides relevant and thorough textual evidence, smoothly integrated to support all aspects of the prompt. Evidence supports all aspects of the prompt and is clearly explained. The response provides relevant and thorough textual evidence that may not be smoothly integrated. Evidence supports all aspects of the prompt and is clearly explained. The response includes some textual evidence that may not be smoothly integrated. Relevance of evidence may not be clearly and fully explained to show support of the prompt. The response is lacking textual evidence, either paraphrased or quoted, even though the prompt is addressed. This response does not meet unit objectives for textual evidence. Exceeds 0.2 points Meets 0.16 points Approaching 0.14 points Falls Below 0.12 points The response consistently uses formal and precise language, varied sentence structure, and academic and domain-specific vocabulary The response uses formal and precise language, but not consistently. Sentence structure is varied and vocabulary is academic and domainspecific. The response is written using informal language with basic use of sentence structure and some academic vocabulary. The response uses informal language, and may include cultural colloquialisms. Sentence structure is very basic and academic vocabulary is not present. This response does not meet unit objectives for language. There are very few errors in grammar, spelling, punctuation, or sentence structure, they do not interfere with readability. Writing exhibits no patterns of error. There are some errors in grammar, spelling, punctuation, or sentence structure, they interfere with readability, but not purpose. Writing exhibits minor patterns of error. There are several errors in grammar, spelling, punctuation, or sentence structure, they interfere with readability, and purpose. Writing exhibits patterns of error. This response does not meet unit objectives for conventions. Meets 0.8 or more Approaching 0.7 or more Falls Below 0.6 or more The response is fully developed with detail that Elaboration demonstrates an understanding of the topic and text. Evidence ` Language There are no errors in grammar, spelling, punctuation, or Conventions sentence structure. Writing exhibits no patterns of error. Overall Score Exceeds 0.9 or more Approaching 0.14 points Falls Below 0.12 points Falls Far Below 0 points Falls Far Below 0 points Falls Far Below 0 or more
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