Microsoft Word - Snelling Chem 1A Spring 2019 Exam 4 MWF.docx 1 Name:_________________________ PLEASE PRINT CLEARLY ON ALL PAGES EXAM 4 CHAPTERS 9, 10 (2 points) Give an example of an ionic bond using...

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Microsoft Word - Snelling Chem 1A Spring 2019 Exam 4 MWF.docx 1 Name:_________________________ PLEASE PRINT CLEARLY ON ALL PAGES EXAM 4 CHAPTERS 9, 10 (2 points) Give an example of an ionic bond using 2 elements. (2 points) Give an example of a covalent bond using 2 elements. (12 points) Draw a Lewis electron-dot symbol for each atom: Rb Si I Ba Kr Sr (4 points) Give the group number and an example of the element corresponding to each electron-dot symbol 2 Name:_________________________ PLEASE PRINT CLEARLY ON ALL PAGES (2 points) Circle the element whose Lewis symbol is correct. (8 points) Circle the compound with the highest lattice energy. Box the compound with the lowest lattice energy CaS(s) BaO(s) NaI LiBr(s) MgO(s) CsBr(s) NaCl(s) SrO(s) CaO(s) KBr(s) (4 points) Formic acid (HCOOH; structural formula shown below) is secreted by certain species of ants when they bite. Circle the stronger bond in each of the pairs: CO CO HC OH (6 points) Indicate the polarity of each bond with a polar arrow (in the space provided above the compound). N-B N-O C-S S-O N-H Cl-O 3 Name:_________________________ PLEASE PRINT CLEARLY ON ALL PAGES (20 points) Sports trainers treat sprains and soreness with ethyl bromide. It is manufactured by reacting ethylene with hydrogen bromide. Use bond energies (kJ/mol) to find the enthalpy of reaction. C C H H H H + H Br CBr H C H H H H H0rxn = ΣΔH0BB + ΣΔH0BF kJ/mol C=C 614 H-Br 363 C-C 347 C-H 413 C-H 413 C-Br 276 4 Name:_________________________ PLEASE PRINT CLEARLY ON ALL PAGES (2 points) In neutral molecules How many bonds are commonly formed by carbon?___________________ How many by phosphorus? ___________________________________________ (12 points) In the following structure, calculate the formal charge for EACH atom. Circle the structure that is most likely to occur. Are the molecules resonance structures (yes or no)? _________________________ (6 points) Name the shape and give the ideal bond angles for the following general molecules Molecular Shape Bond Angle 5 Name:_________________________ PLEASE PRINT CLEARLY ON ALL PAGES (2 points) What is the molecular shape of NOCl as predicted by the VSEPR theory? (5 points) What is the molecular shape of ClCN as predicted by the VSEPR theory? (Carbon is the central atom.) (5 points) What is the molecular shape of SCl3F as predicted by the VSEPR theory? (8 points) Draw the following for IF2O2- Lewis dot structure Molecular shape Electronic shape Bond angle(s)