SUBMISSION INSTRUCTIONS: WHAT: Printed questionnaire with the answers written in a big yellow booklet. One page per number. Paginate each page accordingly. Use different inks to distinguish the bonds of electrons for numbers involving molecular structure. WHO: All students with Student Number ending in ODD number will answer Set A while students with Student Number ending in EVEN number will answer Set B. Indicate your Student Number and the Set you are answering in front of the yellow booklet
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#______________________________________________________ 1. (9 pts) Write a valid Lewis structure for each of the following. Show lone pairs and formal charges where necessary. Draw covalent bonds as lines. (a) bisulfate ion‚ HSO4- O HO S O (b) hydrogen cyanide‚ HCN O H C N (c) hydrazoic acid‚ HN3 (arranged HNNN) H N N N or H N N N 2. (10 pts) Indicate which of the following pairs do not constitute resonance structures by drawing an “X” in the space provided? O CH3C-O O -
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Which is not an acceptable Lewis structure for the anion (CH2NCO)–? a. H C N C O H b. H C N C O H c. H N d. O H N C H C C H C O A) a B) b Ans: C C) c D) d Page 1 5. Which of the following is (are) valid Lewis structure(s) for the anion (HCONCH3) –? O H H a. C C H N H O H H C C H N H O H H C H N H b. c. d. a and b e. a‚ b‚ and c A) a B) b Ans: D C) c D) d E) e 6. Which of the following is (are) valid Lewis structure(s) for the anion (CH2NO2)–
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potassium oxide lithium chloride barium sulfate phosphate ion dinitrogen tetroxide Give the complete electron configurations of: S‚ O2-‚ and Mn. For the following molecules/ions‚ give the Lewis structure‚ molecular geometry‚ and electron pair geometry: NO2- SF4 Write Lewis structures to represent all resonance forms of CO32-. 5. How many joules of heat energy are lost when a 100-gram sample of a metal (with a specific heat of 0.312 J/(gºC) cools from 80.0ºC to 30.0ºC? Calculate
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Name: ____________________________ CHEM 420 Exam 1 Fall 2013 Dr. David Hodapp Read and sign the CRC Honor Code on the next page before starting the exam. Answer all essay questions using complete sentences and proper spelling‚ punctuation‚ and grammar. Points Multiple Choice 34 Matching 12 Fill-In 14 Problems/Essay Questions 90 Total 150 o G = -RT(lnK ) = -2.303RT(log K ) 10 eq k r Ae eq Ea / RT 1 Cosumnes River College Honor Code*
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strained. (Try to model!) BAD! Ok! ** Bredt’s Rule: Can’t have sp2 carbon at a bridgehead. (No alkenes‚ no carbocations!) Or‚ notice the trans-alkenes in small rings. 60 Chemistry S-20 Week 1 Carbocation Stability 1. Draw the structure of the methyl cation‚ CH3+. Describe the hybridization‚ geometry‚ and orbitals in this species. H H H Carbon is sp2-hybridized‚ with 120° bond angles and a vacant p-orbital. 2. Each of the following carbocations is significantly more
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e Sr2+ 6. Which species below has the least number of valence electrons in its Lewis symbol? a. Ar+ b. Ga+ c. Mg2+ d. S2- e. F- 7. Which element below has six electrons surrounding its Lewis symbol? a. Cr b. Ni c. Ba d. Se e. As 8. Which species has the most valence electrons in its Lewis symbol? (NOTE: the question has only one choice‚ Nothing wrong in it‚ just compare between
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SiO2 O Si O O Si O Name Date Class TEACHING TRANSPARENCY WORKSHEET Lewis Structures 29 Use with Chapter 8‚ Section 8.3 1. Step 1 in drawing the Lewis structure for a molecule is to decide which atoms of the molecule are most likely the terminal ones. In the transparency‚ why are the hydrogen (H) atoms in hydrazine (N2H4) shown as the terminal atoms? 2. Step 2 in drawing a Lewis structure involves determining the total number of valence electrons in the atoms in the molecule
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Writing Lewis Dot Formula November 8‚ 2013 I. Learning Objectives At the end of the sessions‚ the students of III- 15‚ and III – 10 must be able to: 1. Students will be able to interpret and draw Lewis dot diagrams for individual atoms and both covalent and ionic compounds. II. Subject Matter A. Topic: Chemical Bonding B. References 1. Department of Education‚ Culture and Sports. (1991). Science and Technology III. Quezon City: Book Media Press‚ pp. 273. 2. Estrella‚ Mendoza E. Chemistry
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BMN103; JOHN LEWIS ORGANISATIONAL STRUCTURE; What is your organisational structure? The governance system of the Partnership was created by our founder‚ John Spedan Lewis and is set out in the Company’s Constitution. Our structure gives our management the freedom to be entrepreneurial and competitive in the way they run the business for long-term success‚ while giving the company’s owners‚ the Partners‚ the rights and responsibilities of ownership through active involvement in the business.
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