CH101 Chemistry Chapter 2 | North Carolina State University

Chapter 2 http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=15304243 1/7 Current Score : 9.5 / 10 Due : Friday, January 27 2017 11:59 PM EST 1. 0.6/0.6 points | Previous Answers X's and check mar ...

Chapter 2 http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=15304243 1/7 Current Score : 9.5 / 10 Due : Friday, January 27 2017 11:59 PM EST 1. 0.6/0.6 points | Previous Answers X's and check marks will not appear for this question. BE SURE to answer all parts of this question before submitting the question! The paths of two particles, A and B, which pass between the plates of an electric field designated by '+' and '¬', are shown below. One is a "cation" with a 1+ charge, and the other is an "anion" with a 1¬ charge. The dashed line in the center represents the path of an uncharged particle. (a) Identify each particle as an anion or a cation. Particle A Particle B (b) What is the approximate ratio of the mass of B to the mass of A (the B/A ratio)? Express your answer as number (like 3.8 or 0.79), not as a fraction (like 7/6 or 7:6). (Hint : Can you tell which particle is heavier?) 0.5 0.5 Chapter 2 (Homework) Forrest Singletary CH 101, section 005, Spring 2017 Instructor: Elena Jakubikova WebAssign The due date for this assignment is past. Your work can be viewed below, but no changes can be made. anion cation anion cation 2/2/2017 Chapter 2 http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=15304243 2/7 2. 0.5/0.5 points | Previous Answers X's and check marks will not appear for this question. BE SURE to answer all parts of this question before submitting the question! Look at the two scenarios below. In I the people do not have to do anything to keep the two charged spheres close to each other. In II, the two people are having a hard time keeping these two charged spheres close to each other (notice the blue sweat drops dripping off their faces). There is also a plot of energy versus distance shown to the right of scenario I. Based on these observations, choose the correct description for the scenario indicated. a) If the charge on sphere C is positive, the charge on sphere D is b) The blue point labeled "1" on the graph corresponds to c) The scenario in which the spheres are most stable (i.e., lowest energy) is d) The scenario in which the potential energy is highest is positive negative scenario II scenario I scenario II scenario I 2/2/2017 Chapter 2 http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=15304243 3/7 3. 1.25/1.25 points | Previous AnswersWertzM 2.P.004. Determine the energy of an electron in the given quantum level of each of the following ions. (Hint: Each of the ions has a different number of protons, but each has only one electron, so the Bohr model applies.) (a) Li2+ with n = 4 ¬1.22e¬18 ¬1.23e¬18 J (b) O7+ with n = 6 ¬3.87e¬18 ¬3.88e¬18 J Supporting Materials Periodic Table Fundamental Constants 4. 0.5/0.5 points | Previous Answers Which of the following points could be concluded or determined from Milliken's oil drop experiment? Check all the boxes that apply. (There may be anywhere from zero to four correct responses.) This question is graded "all or nothing", no partial credit. scenario I scenario II the charge on the electron the number of electrons in the atom the particles adhering to the oil droplet were negatively charged the charge on the nucleus 2/2/2017 Chapter 2 http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=15304243 4/7 5. 1.5/1.5 points | Previous AnswersWertzM 2.P.001. What are the frequency and energy of a photon with a wavelength of 415 nm? frequency 7.22e+14 7.22e+14 s¬1 energy 4.78e¬19 4.79e¬19 J Supporting Materials Periodic Table Fundamental Constants 6. 0.5/0.5 points | Previous Answers Which of the following points could be concluded or determined from Thomson's cathode ray experiment? Check all the boxes that apply. (There may be anywhere from zero to five correct statements.) This question is graded "all or nothing", no partial credit. 7. 0.5/0.5 points | Previous Answers Select all of the subatomic particles that are contained in the nucleus of an atom or ion. cathode rays were negatively charged the charge to mass ratio of the cathode rays the numerical charge of the cathode rays cathode rays were particles, not light waves the numerical mass of the cathode rays proton neutron electron 2/2/2017 Chapter 2 http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=15304243 5/7 8. 0.6/0.6 points | Previous AnswersWertzM 2.P.009. Each of the following sets of given quantum numbers is unacceptable, but each can be corrected by changing only one quantum number in the set. Identify which quantum level should be changed and then select a value for that quantum number that makes the set acceptable. n l ml ms incorrect quantum level acceptable quantum number (a) 4 0 ¬4 ¬1/2 ml ml 0 0 (b) 0 0 0 ¬1/2 n n +2 +6 (c) 6 ¬5 ¬5 1/2 l l +5 +5 Supporting Materials Periodic Table Fundamental Constants 2/2/2017 Chapter 2 http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=15304243 6/7 9. 1.05/1.05 points | Previous AnswersWertzM 2.P.006. Which transition in a hydrogen atom would emit the photon of greatest frequency? Which transition in a hydrogen atom would absorb the photon of greatest frequency? Supporting Materials Periodic Table Fundamental Constants 10.0.5/0.5 points | Previous Answers Rank the following charge/distance combinations from lowest energy to highest energy. Your answer should be a four letter "word" made up of the letters a, b, c and d. For example, if you think the order is a (lowest energy), then b, then c, then d (highest energy), you should enter the "word" abcd in the answer box. Note, the word has no spaces or commas. a) A ¬3 charge and a +2 charge separated by 3 units of distance b) A +2 charge and a +2 charge separated by 4 units of distance c) A ¬3 charge and a ¬2 charge separated by 4 units of distance d) A +2 charge and a ¬4 charge separated by 3 units of distance dabc dabc 2/2/2017 Chapter 2 http://www.webassign.net/web/Student/Assignment-Responses/view_key?dep=15304243 7/7 11.0.75/0.75 points | Previous Answers Please enter a number, not a word. According to the periodic table resource from our textbook, how many elements are in: group 2 (or group 2A)? 6 6 group 7 (or group 7B)? 4 4 group 15 (or group 5A)? 5 5 12.0.75/0.75 points | Previous Answers Please enter a number, not a word. According to the periodic table resource from our textbook, how many elements are in the second period? 8 8 fourth period? 18 18 sixth period? 32 32 13.0.5/0.5 points | Previous Answers Which of the following points could be concluded or determined from Rutherford's gold foil experiment? Check all the boxes that apply. (There may be anywhere from zero to four correct responses.) This question is graded "all or nothing", no partial credit. 14.0/0.5 points | Previous Answers Rank the following charge/distance combinations from lowest energy to highest energy. Your answer should be a four letter "word" made up of the letters a, b, c and d. For example, if you think the order is a (lowest energy), then b, then c, then d (highest energy), you should enter the "word" abcd in the answer box. Note, the word has no spaces or commas. a) A +1 charge and a +2 charge separated by 2 units of distance b) A ¬1 charge and a +3 charge separated by 2 units of distance c) A ¬2 charge and a ¬2 charge separated by 2 units of distance d) A +2 charge and a ¬1 charge separated by 2 units of distance abdc bdac most of the mass of an atom is contained in the nucleus most of an atom is empty space the number of electrons in the atom the mass of the alpha particles