Graded Assignment Name: SCI302B: Chemistry | Unit 5 | Lesson 11: 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. (8 points) 1. The reaction below occurs in a closed system. The reactants were mixed and the reaction was allowed to reach equilibrium. CaCO3 (s) + 2HCl (g) ↔ CaCl2 (s) + H2O (l) + CO2 (g) Score ∆H = –90 kJ/mol • Is this reaction a single replacement or a double replacement? Explain your answer. • If more HCl is added to the system, how will the reactions shift to reach equilibrium again? • If CO2 is removed from the system, how will the reactions shift to reach equilibrium again? • If heat is added to the system, how will the reactions shift to reach equilibrium again? • What is the principle that helps identifies shifts in equilibrium? Answer: © 2012, 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 1 of 3 Graded Assignment SCI302B: Chemistry | Unit 5 | Lesson 11: Unit Test (8 points) 2. The graph below shows the progress of a chemical reaction and the energy changes occurring as two molecules react. Thoroughly explain what is happening or what the state of the reaction is at A, B, C, and D. Then indicate if this reaction is exothermic or endothermic, and explain why. Score Answer: © 2012, 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 2 of 3 Graded Assignment SCI302B: Chemistry | Unit 5 | Lesson 11: Unit Test (5 points) 3. The Haber process to produce ammonia is synthesis reaction commonly used in industry. Ammonia NH3 (g) and heat are produced when H2 (g) and N2 (g) are combined. Score The reaction takes place in a reaction vessel at a high temperature close to 600 0C. Within the reaction vessel, the reactant particles move freely. Explain this synthesis reaction in terms of the collision theory. Answer: Your Score © 2012, 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 21 Page 3 of 3
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