Answer these questions

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Graded Assignment Name: SCI302B: Chemistry | Unit 3 | Lesson 11: Unit Test Date: Graded Assignment Unit Test, Part 2 Answer the questions. When you have finished, submit this assignment to your teacher by the due date for full credit. You may use a scientific calculator for this test. (5 points) 1. Describe the reaction of a weak acid and a strong base. In general, what will the final pH be when the reaction between equal moles of a weak acid and a strong base is complete? Explain your answer. Score Answer: (5 points) 2. A lake in Utah has a hydronium ion (H3O+) concentration of 4.60 x 10-9 M. Calculate the pH of the water – be sure to show the formula you used and each step of your calculations. Score Answer: Your Score © 2012, 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 10 Page 1 of 1
Graded Assignment Name: SCI302B: Chemistry | Unit 4 | Lesson 10: Unit Test Date: Graded Assignment Unit Test, Part 2 Answer the questions. When you have finished, submit this assignment to your teacher by the due date for full credit. Unless otherwise instructed, you may use a scientific calculator and refer to the periodic table in Chemistry: Problems and Solutions. (5 points) 1. The bodies of adult humans are composed of 55-60% water. Using the information from this unit, how does the water help us to disperse heat and regulate our body temperatures? Score Answer: (8 points) 2. The combustion of liquid heptane (C7H16) in oxygen spontaneously occurs. The products of the reaction are carbon dioxide and water vapor. The enthalpy of this reaction is –4818 kJ. Using the given information, write the complete thermochemical equation for this reaction. Explain how you developed this equation, and specify what the equation tells us about the reaction? Score Answer: Your Score © 2012, 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 13 Page 1 of 1
Graded Assignment Name: SCI302B: Chemistry | Unit 6 | Lesson 10: Unit Test Date: Graded Assignment Unit Test, Part 2 Answer the questions below. When you have finished, submit this assignment to your teacher by the due date for full credit. (8 points) 1. The diagram shows an electrochemical cell with a copper strip in a solution of copper (II) nitrate (left) and a magnesium strip in a solution of magnesium nitrate (right). Score In your response, do the following: • Fill in the table below to label all parts of the electrochemical cell. • State which metal is the cathode and which metal is the anode, using the given activity series. • Draw on the diagram (or describe in detail) the flow of electrons. • What type of electrochemical cell is pictured? Explain how the cell works. Include the actual oxidation and reduction half-reactions in your explanation. Answer: 1 Metal = 6 2 Solution = 7 3 Cathode or Anode 8 4 5 Solution = Metal = 9 Cathode or Anode © 2012, 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 1 of 3 Graded Assignment (8 points) SCI302B: Chemistry | Unit 6 | Lesson 10: Unit Test 2. The diagram shows an electrochemical cell with a silver strip (left) and an aluminum fork (right). Score In your response, do the following: • Fill in the table below to label all parts of the electrochemical cell. • Draw on the diagram (or describe in detail) the flow of electrons. • State what type of electrochemical cell is pictured and what its use is. • Explain how the cell works. Include the actual oxidation and reduction half-reactions in your explanation. Answer: 1 Cathode or Anode 4 2 Cathode or Anode 5 3 Metal = 6 © 2012, 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Metal = Page 2 of 3 Graded Assignment (8 points) SCI302B: Chemistry | Unit 6 | Lesson 10: Unit Test 3. Compare and contrast an electrolytic cell with a wet voltaic cell by filling in the table. Score Answer: Electrolytic Cells Wet Voltaic Cells Cells (Separate or together) Electrolyte (describe consistency) Electrodes (type of substances) Oxidation Reaction (which electrode) Reduction Reaction (which electrode) Example Uses Requires Electrical power? (yes or no) Produces Electrical power? (yes or no) Your Score © 2012, 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 24 Page 3 of 3
Graded Assignment Name: SCI302B: Chemistry | Unit 2 | Lesson 12: Unit Test Date: Graded Assignment Unit Test, Part 2 Answer the questions below. When you have finished, submit this assignment to your teacher by the due date for full credit. (5 points) 1. The ink in a marking pen contains a mixture of water, pigments, and dyes of different colors. In this solution, identify the solvent and solutes. Score Answer: (5 points) 2. Explain collision theory, and discuss how it can be used to explain why table salt will dissolve in water faster than a coarse salt with larger crystals. Score Answer: Your Score © 2012, 2009 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 10 Page 1 of 1

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