Glen Allen High School – Henrico County Public Schools



Dear AP Chemistry Students and Parents,?Welcome to AP Chemistry! I am so excited to start the new school year! I hope that you are having a great end to this school year and that you have a wonderful summer planned.?AP Chemistry is a highly rigorous course that requires lots of effort and motivation, but if you are willing to put in the time, the rewards are huge! For the summer, I believe that you should have a break, relax, and enjoy yourselves…but I don’t want you forgetting what you had previously learned in first-year chemistry. ?This assignment is intended to help you review the most important first-year chemistry concepts and also to gain a familiarity with the online homework program. If you find yourself struggling to answer any of the questions or problems, I expect that you will first use online resources for clarification. If you are still experiencing difficulty, you can wait and ask questions during the first week of school, as no part of the assignment is due until the second week of school. ?Thank you,Adam GraysonStep 1: Keep your current lab notebookif you’ve lost it, or if it’s full, purchase a new oneStep 2: Consider purchasing an AP Chemistry test prep bookwe recommend Barron’s or the Princeton ReviewStep 3: Register for UTHomeworkThe program we use for homework assignments in this class is called Quest UT Homework. It is a program that grades your homework assignments for accuracy, but you get to attempt each question multiple times. For the first few assignments, you will hate it, but it gives you immediate feedback so in the long-run, it’s good for you! *A note about sig figs with UTHomework – for any question in which you have to type in the answer, do not use sig figs. Instead, type in the full answer that appears in your calculator.Go to on “Log In to Quest”Click on “I need a UT EID”Complete the steps necessary to obtain an ID.Once the program gives you an ID, write it do and close your browser. Then go back to Click on “Log In to Quest”Logon. Click on “Enroll in new course”.The Unique # for this course is 4470AP. When you click on “Lookup course info”, choose GAHS AP Chemistry. Click “Request Enrollment”Once you requested enrollment, send me an email (amgrayson@henrico.k12.va.us)I would recommend that you register for UTHomework ASAP, so that when you’re ready to actually start your assignment this summer, you’re already set-up and ready to go!Step 4: Complete UTHomework Assignments #1a – 1d Due Sunday, September 15th at midnightStep 5: Complete the following review assignmentDue Monday, September 16th during class.Reaction review, Stoichiometry review, and 2 AP questions.Read the directions for each carefully and please complete them to the best of your ability.Section 1 – Writing and balancing chemical reactionsFor each of the following, (a) write a balance chemical reaction, (b) write a balanced net ionic equation if possible, and (c) a brief statement that describes what observations can be seen.Solid aluminum is put into a solution of copper(II) sulfate, a blue solution.Nitric acid is reacted with a solution of sodium carbonate to form aqueous sodium nitrate, water, and carbon dioxide.Solutions of potassium iodide and lead (II) nitrate are mixed.To decompose, solid potassium chlorate is heated.Section 2 – Stoichiometry practiceSolve each of the following questions and please SHOW YOUR WORK!2.1 Elixirs such as Alka-Seltzer use the reaction of sodium bicarbonate with citric acid in aqueous solution to produce a fizz:3NaHCO3 (aq) + C6H8O7 (aq) → 3CO2 (g) + 3H2O (l) + NaC6H5O7 (aq)What mass of C6H8O7 should be used for every 1.0 x 102 mg NaHCO3?What mass of CO2 (g) could be produced from such a mixture?What volume of CO2 (g) would this be at 0.982 atm and 300. K?2.2 Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen, and methane:2NH3 (g) + 3O2 (g) + 2CH4 → 2HCN (g) + 6H2O (g)If 5.00 x 103 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and H2O will be produced.2.3 Aluminum reacts with bromine, producing aluminum bromide:2Al (s) + 3Br2 (l) → 2AlBr3 (s)In a certain experiment, 20.0 mL of bromine (density = 3.10 g/mL) was reacted with excess aluminum to yield 50.3 g of aluminum bromide. What is the percent yield for this experiment?Section 3 – Sample AP QuestionsThese are sample AP questions released from college board, they are all topics that is covered in Honors Chemistry. Please try these problems to the best of your ability on a separate sheet of paper.3.1 - 2018 Question #1Na2S2O3 (aq) + 4NaOCl (aq) + 2 NaOH (aq) → 2 Na2SO4 (aq) + 4NaCl (aq) + H2O (l)A student performs an experiment to determine the value of the enthalpy change, ?Hrxn°, for the oxidation-reduction reaction represented by the balanced equation above.Calculate the number of grams of Na2S2O3 needed to prepare 100.00 mL of 0.500 M Na2S2O3 (aq)The solutions, all originally at 20.0 °C, are combined in an insulated calorimeter. The temperature of the reaction mixture is monitored, as shown in the graph below.According to the graph, what is the temperature change of the reaction mixture?The mass of the reaction mixture inside the calorimeter is 15.21 g.Calculate the magnitude of the hear energy, in joules, that is released during the reaction. Assume that the specific heat of the reaction mixture is 3.94 J/(g·°C) and that the heat absorbed by the calorimeter is negligible.Write the balanced net ionic equation for the given reaction.3.2 – 2016 Question #1A student investigates the enthalpy of solution, ?Hsoln, for two alkali metal halides, LiCl and NaCl. In addition to the salts, the student has access to a calorimeter, and balance with a precision of ±o.1 g, and a thermometer with a precision of ±0.1°C.To measure, ?Hsoln for LiCl, the student adds 100.0 g of water initially at 15.0°C to a calorimeter and adds 10.0 g of LiCl (s), stirring to dissolve. After the LiCl dissolves completely, the maximum temperature reached by the solution is 35.6°C.Calculate the magnitude of the heat absorbed by the solution during the dissolution process, assuming that the specific heat capacity of the solution is 4.18 J/(g·°C). Include units with your answer.Determine the value of ?Hsolnfor LiCl in kJ/mol.Write the complete electron configuration for the Na+ ion in the ground state.Using principles of atomic structure, explain why the Na+ ion is larger than the Li+ ion.Below is a representation of a portion of a crystal of LiCl. Identify the ions in the representation by writing the appropriate formulas (Li+ or Cl-) in the boxes below.? ................
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