Chemistry Final Exam

A synthesis of linker-free BODIPY-glycine derivatives, via functionalization at the boron atom, is reported. Mulitiple choice, diagrams, calculation problems. Final Practice examination answer Key 3 you will have a maximum of 2. CHEM%1310% Sample%Final%Exam% 21. This drawing shows the surface of water in a 10 mL graduated cylinder. Transcript Audio. Thanks to former UTC Students Eric Cohen. I'd like to know is there one unit in each test. Any new / fresh / updated results shall be hosted only after 6 P. Now you have an opportunity to use the chemistry knowledge you have gained to do some investigating into products you use regularly and learn about the chemistry behind the product or the people who make the product. High School. Hour Exam Room Assignments Hour Exam 2 Room Assignments Past Hour Exams Skip to main content Exam Information. The problem sets provided here are similar to those found on various kinds of standardized exams, such as GRE, ACS & MCAT. The following is an actual question given on a University of Washington chemistry final exam: "Is Hell exothermic (gives off heat) or endothermic (absorbs heat)? Support your answer with a proof. The final exam will be available on Thursday, August 2nd from 8:00 AM to 4:00 PM. Chemistry (B) Final Exam Study Guide Cover Page Chemistry (B) Final Exam Study Guide 1 Chemistry (B) Final Exam Study Guide 2 Chemistry (B) Final Exam Study Guide 3 Chemistry (CP) Final Exam Study Guide 1 answers Chemistry (B) Final …. Name:_____ Unit 1 - Thermochemical Changes. Chemistry Final Exam. More than 400 professional academic writers are ready to help you. Students who find that a final exam has been scheduled during the last week of classes in any of their courses should contact the Office of Undergraduate Academic Affairs at 631-632-7081. Topics include: Temp/pressure, bonding, chemical reactions, pH, ideal, orbital diagram,Stoichiometry, gas law, and all the typical topics covered in HS chemistry. Policy on Daily Student Exam Load Faculty Senate policy states that students should not be required to take more than two final exams in one calendar day, and where conflicts arise, faculty should work with students to make necessary arrangements to avoid the conflict. Chemistry 11 Final Exam Study Guide Chemistry 11 - Final Exam Study Guide Page 15 When Electronegativities of bonding atoms are the same (as they are in diatomic molecules) or close to the same, they SHARE electrons. If the ion of element X has a mass of 34 and 18 electrons, what is the identity of the element, and how many neutrons does it have?. Many college courses require you to take the first section of the American Chemical Society General Chemistry Exam as your final. Chemistry is the science of matter and its interactions. Identify the letter of the choice that best completes the statement or answers the question. View Assignment - General chemistry final exam. Will your mass change or will your weight change if you go to the moon? Only weight will change. Please verify any information provided by this website with your professors and TAs to ensure accuracy. Secure Exam for Classroom Use. The questions are roughly organized by subject, and most sets have over 50 multiple choice problems. Grade 10 Exam Review #1- Chemistry Name: _____ Date: _____ I have compiled a list of questions in attempt to help you study for the final science exam. This refresher course follows the curriculum as presented in the ACS Organic Chemistry study guide. txt) or read online for free. For example there's. (Not on the final for spring) 2. Bonds formed when atoms share electrons are called Covalent Bonds. There are two old final exams here as well, with answer keys. ) to assist you. See also Chemistry NOTES Index. Show all your work, write units in your answers, and use correct significant figures. Solving equations and practical problems should be a feature part of your study routine. 6 Grade 11 Chemistry. a great way to study for your exam. The UCI Chemistry Department offers a single Common Final exam for all students taking each chemistry class in the general chemistry series (1A, 1B, 1C). 70 Multiple Choice questions. *Customers on a monthly billing cycle are billed every four weeks. What is the definition of chemistry?. The first will be a planned review covering salient topics of the course, as well as practice problems. Final Projects, Final Papers and Take Home Exams. pete marsden page 21 of 22 y’all have been amazing. ** Remember: Quiz yourself, Check your answers, Understand what you missed, Analyze the questions and write other questions that could be asked. Best collection of free downloadable 2008 to 2018 Primary, Secondary and JC test papers (CA1, SA1, CA2, SA2) from top schools in Singapore. Part 1: Answer all 20 multiple-choice questions. 9, 2005 9:00 - 12:00 noon Gym This exam contains pages numbered 1 through 11 and a detachable periodic table/data sheet. You don’t need to memorize what they are. Home; MHS Moodle Course Selection. QUESTIONS 1-50 COUNT ONE POINT EACH. MIT OpenCourseWare is a free & open publication of material from thousands of MIT courses, covering the entire MIT curriculum. CH 301 - PRINCIPLES OF CHEMISTRY I free online testbank with past exams and old test at Texas (UT). CHM 101 Final Exam. OLD EXAMS from Fall 2016: Exam I Exam I Key. Repeat Questions from Exams. Chemistry Final Exam Review. CHEM 110 Final Exam Part 1 (Beamer) Page 1 of 11 Last Name Lab Section (Circle One) M W First Name R CHEMISTRY 110 – FALL (2015) SEMESTER FINAL EXAM PART 1A: MULTIPLE CHOICE • Final answers must be on the SCANTRON sheet. Exam 1: Tuesday, September 25, 7:00-8:30 pm (conflict from 5:00-6:30 pm) Exam 2: Tuesday, October 30, 7:00-8:30 pm (conflict from 5:00-6:30 pm) Exam 3: Thursday, December 6, 7:00-8:30 pm (conflict from 5:00-6:30 pm) Final Exam:. made of two or more elements chemically combined. It especially pays to rule out one or two obviously incorrect answers, even if you aren't sure about. Choose your answer to the question and click 'Continue' to see how you did. CHEM 2A – FINAL EXAM 11. They should perform better in modern browsers and adapt better to mobile devices. Thursday June 29, 2017 - 11:18 am SBI Clerk Final Exam Result. 1 - Molecules & Elements 2 - Chemical Analysis 3 - The Mole 4 - Coulomb's Law 5 - Electron Configuration 6 - Periodicity. Exam 1 will be on Friday Feb. (16 pts) Nitrogen gas, N2 reacts with hydrogen gas, H2 to form ammonia gas, NH3 in the presence of a proper catalyst. for GCSE Physics, Biology and Chemistry Providing FREE, comprehensive, fully illustrated and easy to follow revision notes with examples. Final Exam Conflicts. 25) and 63 on the physics exam (class distribution: μ = 59, σ = 3. After you take an AP Exam, we send your score report to the college or university that you designated on your answer sheet. atom, formula unit, molecule. Do all preliminary work on the worksheets. Chemistry 30 - Practice Final Exam. It may be that your test is the culmination of a year (or even more) of study. 626 x 10-34 J s (Planck's Constant) c = 3. The exam will be hard if you don't actually know your stuff and you where just looking for answers online during the online portion. *Customers on a monthly billing cycle are billed every four weeks. The domain of the function is the set of numbers x satisfying: (A) x # 2 (B) x – 2 (C) x $ 2 (D) all real numbers. Montague Moodle Site. In which of the following groups of substances would dispersion forces be the only significant factors in determining boiling. Transcript Audio. Ultrasonic: frequencies higher than 20,000 Hz. Spring 2010 Semester K. Cortisone (steroid)- reduces swelling and decreases the body's immune response. hand written, b. FAll term 2019: final exam schedule by class meeting hours Times for Final Examinations in most classes are determined by hour of first weekly lecture of the first full week of the term. Chem 171-2-3: Final Exam Review Multiple Choice Problems 1. This compressed (. Internal Exam Paper : First Term : 2012-2013 : 2013-2014. Printable Chemistry Tests, Worksheets, and Activities. Circle your answers 1. Animation s & Video s for fun. The Chemistry 1210 Final Exam consists of 40 questions and covers Chapters 1-10 and 12 from the 12th Edition of "Chemistry the Central Science" by Brown, LeMay, Bursten, Murphy, and Woodward. 3) Several equations mostly from kinetics and electrochemistry 4) A periodic table with atomic masses Format of the test: 1) 70 multiple choice questions from General Chemistry I and General Chemistry II. About 35% will be on Test #2 related material. 25) and 63 on the physics exam (class distribution: μ = 59, σ = 3. A little about me   My name is Kristine Ahrens This year will mark my 25th year as a science educator. The questions begin at number 16 because there was a set of 15 multiple. proton - neutron -. One of the nerve-racking things about being a student is wondering how well you must do on a final in order to earn a certain grade in your classes. 1 Which isotope has the greatest number of protons? A Pa-238 B U-240 C Np-238 D Pu-239 2 A neutral atom of a certain element has the electron configuration. Welcome to Dr. Chem 1061 ACS Standardized Exam Score Conversion. Sample Exams Chemistry Courses at Miramar College General Chemistry - II (Chem-201) Practice Final for Chem 200. The final exam will be a standardized American Chemical Society (ACS) exam that will cover the entire year of chemistry, Chem 161, 162 & 163. Identify the choice that best completes the statement or answers the question. In such circumstances it can feel like what you are about write. Don't show me this again. The worksheets will not be graded. Use of cell phones is forbidden and they will be confiscated if used. CHM-118 20154 Intro Chemistry - Lab Keri Flanagan PROJECT EXAM CHM-118 20160 Intro Chemistry - Lab Joel Levy PROJECT EXAM CHM-118 20170 Intro Chemistry - Lab Anthony Di Stasio PROJECT EXAM CHM-118 20171 Intro Chemistry - Lab John Berger PROJECT EXAM CHM-125 20157 General Chemistry I - Lecture Janet Johannessen TUE 2:00-3:50 CH 124. A secure 2017 AP Chemistry Exam is available on the AP Course Audit website. answer the l~llowing questions and do the calculations in order prepare yonrself Ibr the mid-term. Final Exam schedules for Newark are unavailable. Count them to insure that they are all there. 10 sets of subject-wise model question papers for Karnataka PUC II Board Examinations 2019 in downloadable pdf format to help you in your preparations. Final Exam:. For all free or discounted trials, by accepting any such offer you are agreeing to enroll in a 1ShoppingCart. Chemistry Final Exam Review. The LibreTexts libraries are Powered by MindTouch ® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. 100 d) 10 1. Rulis's awesome fall semester study guide found in the back of the chapter 8-9 study guide. CHEM%1310% Sample%Final%Exam% 21. The Chem 13 News Exam will be written on Thursday, May 9, 2019, and is designed for senior high school chemistry students in their second high school chemistry course. Which one of the following molecules will have the lowest boiling point?. Choose your answer to the question and click 'Continue' to see how you did. These are DRAFT answers and may change as errors are pointed out to me, and other thoughts come to my mind. Multiple Choice. Select Semester Board/University Original Certificate should only be treated authentic & final in this regard. Welcome to WatersEdge! The need for public health professionals has never been greater. Kingsborough Community College General Chemistry Final Exam with solutions. mol –1∙K–1 R = 0. Practice Exam 1. Be mindful of this. The goal is to see how well students know and understand chemistry, and to see how well the students compare to other students across the country. Chapters 6 and 8: Chemical Reactions. Chemistry Final. [ posted on 04 June 2019 ] Notice to Candidates: Your response link is being sent through email and SMS and you will be able to see your response on Candidate Portal today after 4:00 PM. 63 Only 2 left in stock - order soon. You don’t need to memorize what they are. You have three hours to complete the exam. So, the science of chemistry is a very wide ranging science. 31 J K-1 mole-1 N A = 6. The exams cover an entire year of chemistry, while the first semester ACS General Chemistry Exam covers mainly CHM 151 topics. MATH 1720 – Precalculus – Final Exam, Fall, 2002 1. Please answer all questions as completely and clearly as possible, showing all your work. If you still have your Unit Tests, it is highly recommended that you use those to review for the final exam in addition to these flashcards. It is for all schools as Form 4 they are only 9 topics, and most of the teachers will not have the time to finish the last topic and more. Common Finals are noted in the chart below. com makes it easy to get the grade you want!. If you need a tutor, Mr. The old AP Chemistry exam emphasized calculations and factual knowledge over a strong understanding of fundamental concepts and mastery of scientific practices. com Sep 30, 2011 - |soalan final exam politeknik 2012cara pertembungan tamadun hari form 4 final exam paper 2012chemistry form 4 mid year exam paper. Listed below is the percentage breakdown for homework, quizzes, hourly exams and the final. on a separate sheet of paper, i. Note: answers to the old exams will not be posted on the web. Here is a list of formulas you need to know for the DAT General Chemistry section. Fast delivery, high quality, 24/7 online support. Convert 52. Final Exam. Your assignment, Stoker: General, Organic, and Biological Chemistry 5e, Final Exam is ready. MrWeng's IB Chemistry. Chapters 6 and 8: Chemical Reactions. If you miss the final exam with an excused absence, contact the Assistant to the Director of General Chemistry within a week of the missed. Define chemistry. High school students who fail the exam are eligible for re-examination and will receive a re-examination request form with the first notification of a failing grade. Evening classes scheduled for a final meeting during the final examination period also fall under this policy. Many insects and small. The final grade in this course will be based on a percentage of points earned relative to total possible points. Even if the student whose 2003 chemistry exam is excerpted below didn’t score any points with his professor on these selected questions, his answers are worthy of enshrinement in this collection. To use a problem set, click on its descriptive title. CHEMISTRY OLYMPIAD LOCAL SECTION EXAM Prepared by the American Chemical Society Chemistry Olympiad Examinations Task Force OLYMPIAD EXAMINATIONS TASK FORCE Seth N. After you take an AP Exam, we send your score report to the college or university that you designated on your answer sheet. CHEMISTRY 121 FINAL EXAM Record your answers on the machine readable answer sheet provided. The exams are listed according to course number. i need a good chemistry cheat sheet that i can shrink onto a 5 by 7 index card for my final exam. Rulis's awesome fall semester study guide found in the back of the chapter 8-9 study guide. 100 d) 10 1. This exam will cover Section I of the AP Chemistry exam. Volume of a Metal 600 500 400 300 200 100 0 10 20 40 5030 Volume (cm )3. Practice Exams. awarded by Chemistry) successfully defended her Ph. txt) or read online for free. on StudyBlue. You would only say "the final exams" if you wanted to talk about a specific group of exams. Perry and E. What is the probability of getting Algebra -> Probability-and-statistics -> SOLUTION: A set of final exam scores in an organic chemistry course was found to be normally distributed, with a. If the ion of element X has a mass of 34 and 18 electrons, what is the identity of the element, and how many neutrons does it have?. Whitcomb - 43 cards; chemistry final exam review - 86 cards; CHEMISTRY FINAL FLASH CARD - 106 cards; Chemistry Final Review - 83 cards; Chemistry Final Semester. The Department of Chemistry and Biochemistry at the City College of New York was originally established as the Department of Chemistry in 1904. Boise State University Office of the Registrar: student records, transcript, registration, transfer credits, grades, degrees, privacy, catalog, classes. Define tbc l~llowing terms and describe where each is located. Dates and timetables. Volume of a Metal 600 500 400 300 200 100 0 10 20 40 5030 Volume (cm )3. These 40 points really count as 80. High school students who fail the exam are eligible for re-examination and will receive a re-examination request form with the first notification of a failing grade. rtf versions, as well as an editible, dynamic E. B) Speed of the object as it falls is 10 m/s. The student measures and records the mass and the volume of each sample and then graphs the data, as shown below. practice final This exam is from the Chem 6A course taught in Fall 2010. Shed the societal and cultural narratives holding you back and let free step-by-step Chemistry textbook solutions reorient your old paradigms. What type of wave is sound? Longitudinal wave. This is a comprehensive course designed to familiarize students with the basic principles of chemistry. How many protons, neutrons, and electrons are present in an atom of the element selenium with the isotopic symbol, ? 2. Exam III Key. Show all your work, write units in your answers, and use correct significant figures. Test your knowledge with sample Chemistry tests on a regular basis. Welcome; Final Exam Review. CH141 Exam III 2016 with Answers. B) Speed of the object as it falls is 10 m/s. For example, if you get 70% with 84 points, you have earned a "B". Resolve Final Exam scheduling issues before finals week. Review the policy for the resolution of final exam conflicts. Mouti Final Exam The Final In short paragraphs with APA references, provide brief answers to the ques9ons on this exam. Below you will find links to old quizzes and exams which are made available for your study. I changed my mind: You may use your calculators for Part 1 of the Final. The final exam is worth 100 points and is multiple choice format. CHEM 1211 and CHEM 1212 National ACS Exams About the Exam Requirement The Augusta University CHEM 1211 and 1212 Principles of Chemistry courses follow a common model for course content and use national exams from the American Chemical Society (ACS). Every year those practical exams are conducted in before commitment of annual final exams and this year also scheduled for government and private college students, those Kar PUC-I & PUC-II student can contact your college principal to get student wise practical test dates for Arts, Science, Commerce stream to Biology, Chemistry, Physics, Computer education practicals 2020. Please answer all questions as completely and clearly as possible, showing all your work. Circle your answers 1. CHM 1311: Exam #1 September 8, 2004 Name_____ Page 4 of 8 SSN_____ 10. Some test takers may associate a particular question with one field, whereas other test takers may have. The same is true for re-grade requests of the second exam, which will be accepted till the morning of the third, and those for the third exam till the morning of the final. Final grade reports will be available after new year and can be requested by email. Final Exam:. Choose your chapter: Fundamentals of Chemistry | Chemical Formulas & Composition Stoichiometry. The CH 1020 final exam has top priority and cannot be rescheduled. The questions are here. Ultrasonic: frequencies higher than 20,000 Hz. i want to do m. The old AP Chemistry exam emphasized calculations and factual knowledge over a strong understanding of fundamental concepts and mastery of scientific practices. Chemistry NYB – Sample Final Exam Page 1. Do not forget to include your SIGNATURE and ID number. It is important because everything you do is chemistry, Even your body is made of chemicals. Chapters 6 and 8: Chemical Reactions. Final Review. Predictionof(Diastereoselectivity(((4a. Chemistry 11 Final Exam Study Guide Chemistry 11 - Final Exam Study Guide Page 15 When Electronegativities of bonding atoms are the same (as they are in diatomic molecules) or close to the same, they SHARE electrons. Even if the student whose 2003 chemistry exam is excerpted below didn’t score any points with his professor on these selected questions, his answers are worthy of enshrinement in this collection. The final exam is comprehensive, covering chapters 7-13 and all labs performed during the quarter. Take the exam on-line and it will be instantly graded. You can access answer explanations as you go through the test in practice mode. Please verify any information provided by this website with your professors and TAs to ensure accuracy. You may use a periodic table, the activity series, and solubility tables. General Chemistry I final exam NAME _ Score _ You may use the periodic table and a. ) _____ Useful information (including a periodic table) is given on the last two pages of the. Conduct of Examinations • Each examination must be taken on the day and at the time as shown on. NOW is the time to make today the first day of the rest of your life. I'm glad you chose option four. Old exams are available for students enrolled in Introduction to Chemistry , General Chemistry I , General Chemistry II , Descriptive Inorganic Chemistry and Inorganic Chemistry. *** Chemistry Safety Video ***. Chemistry Final. This is not the final exam, but it gives you an idea of the kind of questions one can expect in the final exam. DEPARTMENT COURSE NUMBER SECTION(S) COURSE NAME/TITLE DAY/TIME EXAM Location Spring 2019 Final Exam Schedule Architecture ARCH-4936 80 RES INVESTIGATIONS: PROJBUILT Friday, May 3 CASE Architecture ARCH-4952 80 SYSTEMS PROTOTYPING Wednesday, May 1 8-11 CASE Architecture ARCH-4960 01 BUILDING ENVELOPES Thursday, May 2 11:30-2:30 GR 201. Prayer For Exams. Department of Energy Solar Energy Technologies Office to receive nearly $1. The test is worth 250 points and can significantly affect your grade favorably or unfavorably. My General Chemistry Lecture Notes have been placed online (see below) and Internet visuals attached for some topics. *JasonKahn* Final*Exam*(200*points*total)* May*14,*2010*. The following apparatus is constructed in a lab with. The Standardized Chemistry Final Exam, such as the ACS exam taken by college students, may have material that is not covered in any Chemistry Practice Exam offered by this website. 100 d) 10 1. a homogeneous substance. A chemistry student is given 5 samples of a metal. Chemistry (B) Final Exam Study Guide Cover Page Chemistry (B) Final Exam Study Guide 1 Chemistry (B) Final Exam Study Guide 2 Chemistry (B) Final Exam Study Guide 3 Chemistry (CP) Final Exam Study Guide 1 answers Chemistry (B) Final …. Then mark the circle next to the letter for the answer you have chosen. Topics, length, and difficulty of quizzes may vary from semester to semester. Convelú 23 oc to K. Image caption Venugopal Reddy says he is worried about his son "My son scored full marks in maths, physics and chemistry in his 11th class exams. These exams only serve as a guide or template to help students get accustomed to the format, types of questions, mark allocation, and approximate length of a typical final exam. Davidson College sample Molecular Biology exams, 1997-2010. Final Exam Organic Chemistry 2301-1 Spring 2006 Wednesday, May 10, 2006 13 pages. Check your class syllabus to see whether or not there will be a final exam for your. RPSC | Results. If you miss the final exam with an excused absence, contact the Assistant to the Director of General Chemistry within a week of the missed. Chemistry (B) Final Exam Study Guide Cover Page Chemistry (B) Final Exam Study Guide 1 Chemistry (B) Final Exam Study Guide 2 Chemistry (B) Final Exam Study Guide 3 Chemistry (CP) Final Exam Study Guide 1 answers Chemistry (B) Final …. The following are examples of actual examination papers used in past years. CHEM 125a: Freshman Organic Chemistry I. By continuing to browse this site, you are agreeing to our use of cookies. The questions on these tests will still help you practice your skills; just make sure you also use more recent materials for an accurate preview of what to expect on test day. on a separate sheet of paper, i. The UCI Chemistry Department offers a single Common Final exam for all students taking each chemistry class in the general chemistry series (1A, 1B, 1C). [ posted on 04 June 2019 ] Notice to Candidates: Your response link is being sent through email and SMS and you will be able to see your response on Candidate Portal today after 4:00 PM. Remember to balance any chemical reactions before calculating if appropriate. 0 L Set 2: 19. These are: writing and predicting chemical equations, an equilibrium problem, mathematical essays, and nonmathematical essays. Study Flashcards On Chemistry 105 Practice Final Exam at Cram. Addition nuclear chemistry notes Last Updated: 07/15/2015 8800 Grossmont College Drive El Cajon, California 92020 619-644-7000 Accessibility Social Media Accounts. This quiz is incomplete! To play this quiz, please finish editing it. A mixture that is uniform throughout the sample is said to be _____. Tau Beta Pi Engineering Honor Society, California Alpha Chapter. HELP !!! Official course information Homework & KEYS Fall 2019 HW1 due 9/13 by noon HW1KEY HW2 due 10/11 by noon HW2KEY HW3 due 11/22 by noon HW3KEY. CALCULATORS ARE NOT TO BE SHARED. The format is short answer. Some test takers may associate a particular question with one field, whereas other test takers may have. They are provided for information only. Fast delivery, high quality, 24/7 online support. The Physics Department will follow the course policy to generate a 'make up' grade based on the common exam material which is on the final exam. Character tables and a periodic table are provided at the end of the exam (feel free to separate and keep in front of you). For each of the following compounds or ions, draw the best Lewis dot structure. Search for upcoming dates and deadlines by selecting a category and term from the drop-down menus. make-up that portion of the final exam on. AP Studio Art requires students to submit a portfolio for review. 4 L , Match each scientist to his experiment/discovery 1. The study of. We are using this Common Final exam for several reasons, including:. A periodic table and an equation sheet are also provided (attached to the back of your exam). Consider the equation 𝒚=−𝒙𝟐−𝒙+𝟔. For syllabus with current course information and homework problems find your course in UTC Learn (Blackboard). CHEM 1062: Reviewing for the American Chemical Society (ACS) Standardized Final Exam The CHEM 1062 Final Exam will be a full-year standardized exam written by the ACS. A mixture that is uniform throughout the sample is said to be _____. However, almost half of the questions will be on material covered in lecture and lab since exam 2. Final Sample Exam 1412B. best enter these on the special answer sheet. Montague Moodle Site. Pennsylvania Department of Education Keystone Exams: Chemistry – Page 3 Assessment Anchors and Eligible Content Final—March 1, 2010 The Assessment Anchors and Eligible Content are designed to enable educators to determine when they feel students are prepared to be successful in. What is the definition of chemistry?. proton - neutron -. Week News from Science Links After School Help Fun Stuff Teachers' Lounge BHSS Chemistry E-mail Mr. Chapter-wise Important Notes, Explanations, Questions and Answers in ICSE Class 9 Chemistry for scoring 100/100 in Exam. A chemistry student is given 5 samples of a metal.