CHEM 1364 Test #3 Summer 2014 (Buckley) c. S 2- d. SO 3. c. FO 4

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1 Name CHEM 1364 Test #3 Summer 2014 (Buckley) Circle the letter corresponding to the best answer for each of the following multiple choice questions. Each question is worth 2 points. 1. Which one of the following is the sulfate ion? a. SO 3 b. SO 4 c. S d. SO 3 e. SO 4 2. Which one of the following is the ammonium ion? a. NH 4 + b. NH 3 c. NO 3 d. NH 4 e. NO 2 3. Which one of the following is the nitrate ion? a. NH 4 + b. NH 3 c. NO 3 d. NH 4 e. NO 2 4. Which one of the following is the phosphate ion? a. PO 3 b. PO 4 c. FO 4 d. PO 3 e. PO 4 5. Which one of the following is the phoshphite ion? a. PO 3 b. PO 4 c. FO 4 d. PO 3 e. PO 4 6. The correct name for PCl 5 is: a. phosphorous chloride b. phosphorous (V) chloride c. phosphorous pentachloride d. phosphorous chlorine e. phosphorous tetrachloride 7. The correct name for CoCl 3 is: a. cobalt chloride b. cobalt (III) chloride c. cobalt trichloride d. chromium trichloride e. chromium (III) chloride

2 8. An atom with four electron domains will have hybridization. a. sp b. sp 2 c. sp 3 d. sp 3 d e. sp 3 d 2 9. An atom with five electron domains around it will have a electrondomain geometry. a. linear b. trigonal planar c. tetrahedral d. trigonal bipyramid e. octahedral 10. The central atom in a molecule is surrounded by four electron domains. Two of the domains are lone pair electrons and two of the domains are bonded atoms. The molecular geometry around this central atom is: a. linear b. square planar c. trigonal pyramid d. trigonal planar e. bent 11. The molecule referred to in Question 10 will be: a. polar b. nonpolar c. not enough information given to decide 12. Consider the following reaction: 2 HCl (aq) + CaCO 3 (s) CaCl 2 (aq) + H 2 O (l) + CO 2 (g) In an experiment, 4.0mol of HCl are reacted with 3.0mol of CaCO 3. Which is the limiting reactant? a. HCl b. CaCO 3 c. not enough information given to decide 13. How many σ and π orbitals are in the structure below? a. 10 σ, 3 π b. 8 σ, 5 π c. 3 σ, 10 π d. 5 σ, 8 π e. 6 σ, 7 π 14. Which of the following elements routinely has less than an octet around it in Lewis structures? a. C b. N c. F d. B e. S

3 Problems. Point totals are indicated to the right of each problem number in parentheses. 15. (8 points) Answer each of the following. SHOW YOUR WORK. a. How many moles are in 175.0g of Ba(NO 3 ) 2? b. How many grams are in mol of CaCl 2 2 H 2 O? 16. (12 points) Consider the following reaction. MnO 2 + HCl MnCl 2 + Cl 2 + H 2 O 15.0g of MnO 2 are reacted with 20.0g of HCl. Answer the following questions related to this reaction. a. Balance the equation. You can just insert the coefficients in the equation above if you would like. b. How many grams of MnCl 2 could be formed from the quantities indicated above? Show your work. c. Which is the limiting reactant? Explain your reasoning.

4 17. (5 points) Balance the following equations. P 4 O 10 (l) + H 2 O (l) H 3 PO 4 (aq) CO 2 (g) + KOH (aq) K 2 CO 3 (aq) + H 2 O (l) Rb (s) + H 2 O (l) RbOH (aq) + H 2 (g) Al (s) + H 2 SO 4 (aq) Al 2 (SO 4 ) 3 (aq) + H 2 (g) C 3 H 8 (g) + O 2 (g) CO 2 (g) + H 2 O (l) 18. (5 points) Name each of the following compounds. Name CaBr 2 PBr 3 PbSO 4 Cu(NO 3 ) 2 N 2 O 4 Be sure to do the next page

5 1. (20 points) Draw the Lewis structure for each of the following in the lefthand column. Also, place the nonzero formal charges on the atoms of your Lewis structure. Fill in each of the columns as indicated. The geometries and hybridizations refer to the central atom as usual. Lewis Structure # Lone pair electron domains # Bonded electron domains Electrondomain geometry Molecular geometry Polar or Nonpolar? (Y or N) Hybridization around central atom Resonance? (Y or N) PBr 3 CO 3 NH 2 CBr 2 HCl OCS

1. Which response contains all the molecules below that violate the octet rule, and no others? SF 4, SiCl 4, H 2Te, AsF 5, BeI 2

Chem 1100 Pre-Test Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which response contains all the molecules below that violate the octet rule, and no