Quiz #3 Session #2_ Chem 1LE W24

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2/13/24, 6:59 PM Quiz #3 Session #2: Chem 1LE W24 https://canvas.eee.uci.edu/courses/59678/quizzes/300085 1/8 Quiz #3 Session #2 Due Feb 13 at 11:59pm Points 10 Questions 8 Time Limit None Allowed Attempts 3 Instructions Attempt History Attempt Time Score LATEST Attempt 1 22 minutes 9.33 out of 10  Correct answers are hidden. Score for this attempt: 9.33 out of 10 Submitted Feb 13 at 6:59pm This attempt took 22 minutes. The information needed to answer these questions can be found in your general chemistry lecture textbook, the Lab Safety for Chemists online text (https://drive.google.com/file/d/1zGrN2CkyKk- UejhEa277V-VPzfgf-TLr/view?usp=sharing) (http://www.uci.eblib.com/patron/FullRecord.aspx? p=4462550) (Section 2.1.2), in the Odyssey (https://store.wavefun.com/product_p/spstudentuci.html) program and in documents hyperlinked within the project document. Take the Quiz Again 2 / 2 pts Question 1 Match each glassware to its proper use. Answer choices are not used more than once and some might not be used at all. glassware used to accurately transfer small variable volumes graduated (Mohr) pipe

2/13/24, 6:59 PM Quiz #3 Session #2: Chem 1LE W24 https://canvas.eee.uci.edu/courses/59678/quizzes/300085 2/8 glassware used to accurately transfer small fixed volumes volumetric pipet glassware used to accurately transfer and measure variable volumes buret glassware used when contents must be easily accessed beaker glassware used to prevent splashing or evaporation Erlenmeyer ﬂask glassware used to make and store solutions of known concentration volumetric ﬂask 1 / 1 pts Question 2 Which of the following are possible reasons that you may need to dilute the bleach solution given? The absorbance never decreases. The temperature of the solution is too low The concentration of the dye is too high. The dye is unreactive. The reaction occurs too quickly to get good data.

2/13/24, 6:59 PM Quiz #3 Session #2: Chem 1LE W24 https://canvas.eee.uci.edu/courses/59678/quizzes/300085 3/8 1 / 1 pts Question 3 Bleach breaks down dyes, removing color from solution, fabric, etc. Which of the following statements is/are correct? Blue 1 breaks in two at the azo linkage Red 40 breaks in two at the azo linkage Triarylmethane dyes react at their center carbon in a way that either separates the 3 aryl groups into 3 different chemicals All double bonds are destroyed. the extensive bonding responsible for HOMO-LUMO gaps in the visible region is created 2 / 2 pts Question 4 Open Odyssey , go to the Labs tab, find the Kinetics section and click on M2 Reactive Collisions Between Molecules . Follow the instructions on the screen and click on all the available buttons. Which of the following reactant orientations (https://canvas.eee.uci.edu/courses/59678/files/24522310/download? download_frd=1) leads to a reaction? [ Select ] a b

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2/13/24, 6:59 PM Quiz #3 Session #2: Chem 1LE W24 https://canvas.eee.uci.edu/courses/59678/quizzes/300085 4/8 Answer 1: c d e Note: The translational & vibrational energy is equivalent to the negative of an enthalpy of formation. What is the translational & vibrational energy of the reactants ( before the reaction)? (i.e. what is the - H )? [ Select ] kJ/mol What is the translational & vibrational energy of the products ( after the reaction)? (i.e. what is the - H )? [ Select ] kJ/mol The chemical reaction is [ Select ] because the translation & vibrational energy [ Select ] the products is greater than the translation & vibrational energy [ Select ] the reactants. The H is calculated to be [ Select ] kJ/mol. Lower the energy using the slider directly to the right of Total Energy (Molar) in the Properties table. Start by sliding the value to half of the 67.6 kJ/mol displayed. Toggle to a slower speed using the slide just above the + Add Property button. The minimum amount of energy that needs to be put in the system to cause a reaction is [ Select ] kJ/mol. What is this energy called? [ Select ] f(reactants) f(products) rxn a

2/13/24, 6:59 PM Quiz #3 Session #2: Chem 1LE W24 https://canvas.eee.uci.edu/courses/59678/quizzes/300085 5/8 Answer 2: Answer 3: Answer 4: Answer 5: Answer 6: Answer 7: Answer 8: Answer 9: 67.5 130.6 exothermic after before -63.0 between 40 and 45 activation energy 0.33 / 1 pts Question 5 Partial Partial Open Odyssey , go to the Labs tab, find the Kinetics section and click on M3 Mechanism of a Reaction . Follow the instructions on the screen and click on all the available buttons. Each "hill" in the reaction coordinate diagram represents a step in the reaction mechanism. What is the chemical equation for each step?

2/13/24, 6:59 PM Quiz #3 Session #2: Chem 1LE W24 https://canvas.eee.uci.edu/courses/59678/quizzes/300085 6/8 Answer 1: Answer 2: Answer 3: Answer 4: Answer 5: Answer 6: [ Select ] , [ Select ] , [ Select ] , [ Select ] Which step is the rate determining step? step 3 Compare the energies of the reactants in the very first frame (at the beginning) with that of the products in the very last frame (at the end). Is this reaction endothermic or exothermic? endothermic geometry change of CO(OH)F C(OH)2F2 --> CO(OH)F + HF COF2 + H2O --> C(OH)2F2 CO(OH)F + HF --> CO2 + 2HF step 3 endothermic 1 / 1 pts Question 6 Which of the following actions should you take if you or a labmate are on fire? stop, drop, & roll

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2/13/24, 6:59 PM Quiz #3 Session #2: Chem 1LE W24 https://canvas.eee.uci.edu/courses/59678/quizzes/300085 7/8 use a fire extinguisher as the first method others pat the fire with towel or lab coat run out into the hallway to the safety shower wrap the person in a fire blanket 1 / 1 pts Question 7 The PASS acronym is a useful mnemonic is you have to use a fire extinguisher. Match the first word with the rest of the statement. 1st: Pull the safety pin near the 2nd: Aim the extinguisher at the 3rd: Squeeze the handle to begin th 4th: Sweep the discharge back an 1 / 1 pts Question 8 Match the part of the fire tetrahedron with the way to remove it. heat pour water on the fire oxygen

2/13/24, 6:59 PM Quiz #3 Session #2: Chem 1LE W24 https://canvas.eee.uci.edu/courses/59678/quizzes/300085 8/8 carbon dioxide fire ext chemical chain reaction use a halon fire exting fuel keep amounts of ﬂam Quiz Score: 9.33 out of 10