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ExamPractice2Key - Exam 2 - Petrovich CH101 Name: _,_ print...

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Exam 2 - Petrovich CH101 Name: __________________,________________ print last print first Unity ID: ___________________( ex jldoe2) Page 1 # correct = _______/ 1. Use the oxidation state rules on the cover sheet to determine the oxidation state of the underlined atoms in the compounds below. H 2 P O 3 1- CaO 2 Oxidation state of P = __ +3 ____ (2 pts) Oxidation state of O = __ -1 ____ (2 pts) 2. Please give the electron configurations of the following ions. You may abbreviate using a noble gas core. Se 2- ______ [Kr] ___________ (2 pts) Fe 3+ __ [Ar] 3d 5 __________ (2 pts) 3. Use the diagram below to answer the following questions . Pay attention to which electrons are valence electrons. a) What is the most positive oxidation state of element B? ___ +6 ____ (2 pts) b) What is the most negative oxidation state of element B? ____ -2 ____ (2 pts) c) What is the formula of the compound most likely to form between elements A and B? __ A 2 B ____ (2 pts) 4. How many moles of phosphate ions are present in a sample of calcium phosphate that contains 0.54 moles of Ca 2+ ? Ca 3 (PO 4 ) 2 0.54 mol Ca 2+ x (2 mol PO 4 3- / 3 mol Ca 2+ ) = 0.36 mol PO 4 3- __ 0.36 ___ mol phosphate ion (2 pts) 5. Please name the following: (2 pts each) Fe(NO 3 ) 3 _ iron (III) nitrate ____________ CS 2 __ carbon disulfide ____________ Please give the formula of the following: Phosphorus pentachloride _ PCl 5 ___________ Magnesium acetate ___ Mg(C 2 H 3 O 2 ) 2 _____ 6. Circle the MOST polar bond shown below. (2 pts) O-Ge O-S O-Cl O-H E 1s 2 2s 1 1s 2 2s 2 2p 4 Element A Element B
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Exam 2 - Petrovich CH101 Page 2 # correct = _______/ 7. Circle the bonds in which the polarity arrow points to the left (<-+) 1 pt each correct (2 pts) F-H C-O Fe-C N-P 8. How many moles of elemental hydrogen (H 2 ) must react with elemental bromine (Br 2 ) to produce 0.230 moles of HBr? H 2 + Br 2 -> 2HBr (4 pts) 0.230 mol HBr x (1 mol H 2 / 2 mol HBr) = 0.115 mol H 2 __ 0.115 __ mol H 2 9. Please calculate the following values and draw the Lewis structure of OH 3 1+ . Be sure to include all non-zero formal charges.
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ExamPractice2Key - Exam 2 - Petrovich CH101 Name: _,_ print...

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