Test 1 - 1 CHEM 1331 SUMMER 2004 FINAL MORNING Name...

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Unformatted text preview: 1 CHEM 1331 SUMMER 2004 FINAL - MORNING Name _________________________________ Signature ____________________________________________ 1. Line spectra from all regions of the electromagnetic spectrum are used by astronomers to identify elements present in the atmospheres of stars. Calculate the wavelength of the photon emitted when a hydrogen atom undergoes a transition from n = 5 to n = 3 (R = 1.1 x 10 7 m-1 ). (A) 384.6 nm (B) 1282 nm (C) 683.8 nm (D) 410.2 nm (E) 201.5 nm 2. What is the correct order of increasing boiling points among Ca(NO 3 ) 2 , CH 3 OH, CH 4 and Ne. (A) Ca(NO 3 ) 2 < CH 3 OH < CH 4 < Ne (B) Ne < CH 4 < Ca(NO 3 ) 2 < CH 3 OH (C) Ne < CH 3 OH < CH 4 < Ca(NO 3 ) 2 (D) CH 4 < Ne < CH 3 OH < Ca(NO 3 ) 2 (E) Ne < CH 4 < CH 3 OH < Ca(NO 3 ) 2 3. When the redox equation below is balanced in basic using the lowest possible integers, the coefficients of the I 2 (s) and OH- (aq) are (in that order) I- (aq) + O 2 (g) → I 2 (s) + OH- (aq) (A) 2, 2 (B) 2, 4 (C) 1, 4 (D) 2, 1 (E) 1, 2 4. Use Hess's law to calculate the enthalpy change for the reaction, WO 3 (s) + 3 H 2 (g) → W(s) + 3 H 2 O(g) 2 W(s) + 3 O 2 (g) → 2 WO 3 (s) Δ Hº = -1685.4 kJ O 2 (g) + 2 H 2 (g) → 2 H 2 O(g) Δ Hº = -477.84 kJ (A) 252.9 kJ (B) 364.9 kJ (C) 1207.6 kJ (D) 2163.24 kJ (E) 125.9 kJ 2 5. How many milliliters of 1.58 M HCl are needed to react completely with 46.4 g NaHCO 3 to make sodium chloride, water and carbon dioxide? (A) 1144 mL (B) 1072 mL (C) 1276 mL (D) 46.4 mL (E) 350 mL 6. One step in the synthesis of nitric acid is the conversion of ammonia to nitric oxide. Given the Δ Hº f values shown, calculate Δ H rxn for the reaction. 4 NH 3 (g) + 5 O 2 (g) → 4 NO(g) + 6 H 2 O(g). Δ Hº f [NH 3 (g)] = -45.9 kJ/mol, Δ Hº f [NO] = 90.3 kJ/mol, Δ Hº f [H 2 O(g)] = -241.8 kJ/mol (A) -105.6 kJ (B) 906.0 kJ (C) -197.4 kJ (D) 197.4 kJ (E) -906.0 kJ 7. Select the element with the largest SECOND ionization energy (IE 2 ). (A) Rb (B) K (C) Ca (D) Sr (E) Al 8. Which one from each of the following two groups are paramagnetic? I. Kr, Zn, Fr II. Cu + , Ag + , Fe 3+ , Cd 2+ (A) I. Fr II. Fe 3+ (B) I. Fr II. Cu + (C) I. Kr II. Cd 2+ (D) I. Zn II. Fe 3+ (E) I. Zn II. Ag + 9. A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP? (A) 22.4 L (B) 25.2 L (C) 33.6 L (D) 37.1 L (E) 49.2 L 10. Which of these reactions produce a precipitate? i) BaCl 2 (aq) + K 2 SO 4 (aq) → ii) AgNO 3 (s) + HBr(aq) → iii) Cu(NO 3 ) 2 (aq) + Na 2 CO 3 (aq) → (A) (i) and (ii) (B) (i) only (C) (ii) only (D) (ii) and (iii) (E) all 3 3 11. A 275 g sample of nickel at 100.0 ºC is placed in 100.0 g of water at 22.0 ºC. What is the final temperature of the water? The specific heat of nickel = 0.444 J/g K and that of water = 4.184 J/g K....
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Test 1 - 1 CHEM 1331 SUMMER 2004 FINAL MORNING Name...

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