Advanced Chemistry Quiz: Synthesis, Analysis & Key Concepts
School
Humber College**We aren't endorsed by this school
Course
CHEM 100
Subject
Chemistry
Date
Dec 10, 2024
Pages
2
Uploaded by CountBraveryManatee55
Exam Name: Advanced Chemistry Synthesis and Analysis QuizDate: February 15, 2023Duration: 2 hoursTotal Score: 100Instructions:1. This exam is to be completed without the use of aids such as calculators, textbooks, or notes. 2. All questions should be answered in the space provided. 3. Partial credit will be given for correct reasoning where applicable. 4. Please sign your name on the exam cover page before beginning.5. Answer all questions.Multiple Choice Questions (20%)1. What is the IUPAC name for the compound with the molecular formula CHO and the ₇₈structural formula CH -CH OH?₆₅₂A. PhenolB. TolueneC. EthylbenzeneD. AnisoleAnswer: A2. Which of the following statements best describes a coordination complex?A. It is an arrangement of ions in a crystalline lattice.B. It is a compound that is resistant to thermal decomposition.C. It is a compound that contains atoms of the same element bound together.D. It is a molecule with a central metal atom or ion bound to ligands.Answer: D3. Which of the following properties is most associated with the kinetic theory of gases?A. Non-polar covalent bondsB. Intermolecular forcesC. ViscosityD. Graham's law of effusionAnswer: DOpen-ended Questions (30%)1. Discuss the principles of NMR spectroscopy, focusing on its application in determining the structure of organic compounds. Include a description of chemical shift and splitting in your explanation.
2. Elucidate the principles underlying the process of chromatographic separation. Using examples, describe how chromatography is used in analytical chemistry for both qualitative and quantitative analysis of mixtures.3. Describe the process of catalysis in the context of homogeneous catalysis. Include a detailed explanation of the role of catalysts in lowering the activation energy for chemical reactions and their subsequent effect on the reaction rate.Calculation Questions (50%)1. A graduate student studying thermodynamics determines the standard free energy change for a reaction to be G° = -28.5 kJ/mol. If the standard enthalpy change for the Δreaction is H° = -20.1 kJ/mol, calculate the standard entropy change, S°, for the reaction ΔΔat 25°C.2. A biochemist is studying the equilibrium concentrations of reactants and products in the following reaction:A(g) + B(g) C(g) + D(g)⇌At equilibrium, the concentrations are [A] = 0.10 M, [B] = 0.10 M, [C] = 0.20 M, and [D] = 0.20 M. Calculate the equilibrium constant, Kc, for this reaction.3. The quantum yields for fluorescence of two compounds, A and B, are 0.5 and 0.3, respectively. If compound A absorbs 100 J of energy and emits 50 J, calculate the energy absorbed and emitted by compound B if it absorbs the same amount of energy. Draw an energy-level diagram showing the absorption and emission of energy for both compounds.Answers:1. S° = (H° - G°) / T = ( -20.1 kJ/mol - (-28.5 kJ/mol) ) / ( 25°C + 273.15 ) = 0.0407 ΔΔΔkJ/(mol·K)2. Kc = ([C] [D]) / ([A] [B]) = (0.20 M * 0.20 M) / (0.10 M * 0.10 M) = 43. Energy absorbed by B = Energy absorbed by A = 100 JEnergy emitted by B = Quantum yield of B * Energy absorbed by B = 0.3 * 100 J = 30 J[Drawing of energy-level diagram would be included here]