2. If g of BaCl2 xh2o yields g of anhydrous BaSO4 after treatment with sulfuric acid, calculate the value of x. a. 1 b. 2 c. 3 d. 4 e.

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1 Form Code X NAME CHM 2045, Spring 2016, Final Review Packet (Broward Teaching Center) Final Packet Instructions: Do your best and don t be anxious. Read the question, re-read the question, write down all given or valuable information, and write down what you want to find. As on all graded events, the loving of moles applies 1. Which of the following pairings of name : formula is incorrect? a. Calcium Nitrate : Ca(NO3)2 b. Copper Sulfate : CuSO4 c. Lead (II) Carbonate : PbCO3 d. Sodium Perchlorate : NaClO4 e. Carbon Monoxide : CO 2. If g of BaCl2 xh2o yields g of anhydrous BaSO4 after treatment with sulfuric acid, calculate the value of x. a. 1 b. 2 c. 3 d. 4 e. 5

2 3. Which of the following is the correct net ionic equation for the reaction of aqueous silver nitrate and aqueous potassium chloride? a. Ag + (aq) + Cl - (aq) AgCl (s) b. AgNO3 (aq) + KCl (aq) KNO3 (aq) + AgCl (s) c. K + (aq) + NO3 (aq) KNO3 (aq) d. 2Ag + (aq) + 2Cl - (aq) 2AgCl (s) e. AgNO3 (aq) + KCl (aq) AgCl (s) 4. How many atoms of bromine are in 1.5g of iron (III) bromide? a. 5.4 x b. 1.3 x c. 4.8 x d. 3.1 x e. 9.2 x By how many electrons does an atom get reduced in the following reaction? Cu (s) + 2AgNO3 (aq) 2Ag (s) + Cu(NO3)2 (aq) a. 0 b. 1 c. 2 d. 3 e Determine the answer for each of the following calculations with the correct number of significant figures. I) 8.78 x x ( ) II) x / ( )

3 a : 52.8 b. 24 : 53 c : d : e. 24 : Element M has a valence electron configuration ns 1. Element X has the valence electron configuration ns 2 np 5. What ionic compound would most likely result from the reaction between M and X? a. M2X b. MX2 c. MX d. M3X2 e. MX3 8. Arrange the following in order of decreasing size: Na +, Mg 2+, O 2-, F - a. Mg 2+ > F - > Na + > O 2- b. Mg 2+ > F - > O 2- > Na + c. O 2- > F - > Na + > Mg 2+ d. O 2- > Na + > F - > Mg 2+ e. F - >Mg 2+ > Na + > O 2-9. Which of the following has the greatest number of unpaired electrons? a. Cr 3+ b. Mn 2+ c. Ni 2+ d. Ni e. V 2+

4 10. A hot 625-g chunk of iron is plunged into 500. g of water in an insulated container. The temperature of the water increases from 24 to 75 ºC. The specific heat capacity of the iron is 0.45 J/gºC and the specific heat capacity of the water is J/gºC. The initial temperature of the iron was closest to.? a. 380 C b. 450 C c. 143 C d. 760 C e. 286 C 11. A CO2 laser produces radiation of wavelength 2.17 x 10-5 m and gives J per pulse. How many photons are produced per pulse? a. 2.2 x b. 3.2 x c. 7.9 x d. 4.6 x e. 3.1 x Which of the following Bohr transitions absorbs light with the shortest wavelength? a. n = 5 n= 6 b. n = 5 n = 4 c. n = 4 n = 3 d. n= 1 n = 3 e. n = 2 n = 1

5 13. Which of the following quantum numbers (n, l, ml) are not a possible combination? a. 2,1,0 b. 1,0,0 c. 3,1,-2 d. 3,2,2 e. 2,0,0 14. A g sample of a gas with an empirical formula of CHF2 is placed in a L flask. It has a pressure of 760 mmhg at 0 C. What is the molecular formula of the compound? (1) CHF2 (2) C2H2F4 (3) C3H3F6 (4) C4H4F8 (5) C5H5F If it takes 3.09 minutes for 0.55 moles of helium to effuse, how long will it take for the same amount of ethane (C2H6) to effuse? (1) 3.12 min (2) 7.54 min (3) 1.92 min (4) 4.96 min (5) 8.48 min 16. What are the strongest types of intermolecular forces that must be overcome in order to: (a) evaporate isopentane ((CH3)2CHCH2CH3) (b) boil Tert-Butanol (CH3)3COH) (c) boil water

6 (1) (a) dispersion (b) dipole induced (c) dipole-dipole (2) (a) dispersion (b) H-Bond induced (c) H-Bond (3) (a) dispersion (b) H-Bond (c) dipole-dipole (4) (a) dipole-dipole (b) H-Bonding (c) H-bonding (5) (a) dispersion (b) H-Bonding (c) H-bonding 17. Nickel crystallizes in a face-centered cubic structure with an edge length a = 388 pm. Based on this information, calculate the approximate density of nickel. (1) 6.8 g/ml (2) 2.4 g/ml (3) 9.3 g/ml (4) 8.7 g/ml (5) 7.6 g/ml 18. Which pair of aqueous solutions is given in order of increasing freezing point? (1) 0.010m Na3PO4 < 0.030m NaCl (2) 0.020m NaI < 0.030m glucose (3) 0.010m CaCl2 < 0.020m KCl (4) 0.010m Na3PO4 < 0.020m Na3PO4 (5) 0.020m glucose < 0.010m CaCl2 19. What respective type of hybridization is shown by the central atoms in CHF3 and XeF3 +? (1) sp 2, sp 2 (2) sp 3, sp 3 (3) sp 2, sp 3 d (4) sp 3, sp 3 d (5) sp 3, sp 3 d In molecular orbital treatment of diatomic molecules, what type of molecular orbital(s) are created by mixing an s orbital from one atom with a p orbital from the other atom? (1) only σ (2) only π (3) σ and π (4) σ and σ* (5) π and π*

7 21. The active ingredient in super-glues is methylcyanoacrylate. How many sigma (σ) and pi (π) bonds are in one molecule of methylcyanoacrylate? (hint : don t forget to consider the carbon-hydrogen bonds in the molecule) (a) 7 σ, 3 π (b) 7 σ, 4 π (c) 12 σ, 3 π (d) 12 σ, 4 π (e) 16 σ, 4 π

8 22. Predict which solvent will dissolve more of the given solute: left= NaCl in HCl or H2O middle= CCl4 in CHCl3 or H2O right= CH3OH in H2O or C6H14 (1) H2O, CHCl3, H2O (2) HCl, H2O, C6H14 (3) H2O, H2O, H2O (4) HCl, CHCl3, H2O (5) HCl, CHCl3, C6H The decomposition of hydrogen iodide, 2HI(g) H2(g) + I2(g), has rate constants of 9.51x10-9 L/mol-s at 500. K and 1.10x10-5 L/mol-s at 600. K. What is the activation energy of the reaction? (1) 1.74x103 J (2) 1.76x105 J (3) 1.95x10-2 J (4) 5.38x104 J (5) 2.12x104 J 24. Using the above table, determine the rate law. (1) rate = k [A]2[B] [C] (2) rate = k [A] [B]2[C] (3) rate = k [A] [B][C] 2 (4) rate = k [A]2 [B]2[C] (5) rate = k [A] [B]2[C]2

9 25. Using the table, determine the rate constant (L3mol-3s-1). (1) 2.0 (2) 3.0 (3) 4.0 (4) 8.0 (5) In the above table, determine the missing number. (1) (2) (3) (4) (5) GOOD LUCK and SMILE ON THE EXAM!!!

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