test 1 - You are writing VERSION 1 of this test Make sure...

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1 Continued on next page… You are writing VERSION 1 of this test. Make sure you have correctly entered your version number (“1”) in the correct column on your scan sheet (see p. 2 for details). ____ 1. In the event that your teaching assistant has a seizure during a laboratory, the most efficient and appropriate method to obtain medical assistance would be to: a. Run to the security office b. Dial 88 from a campus line c. Dial 911 from your cell phone d. Press the panic alarm e. Find and pull the nearest fire alarm ____ 2. You have precipitated PbSO 4 from an aqueous solution to determine the quantity of dissolved lead. To have the most accurate result , it is important to keep the sample under vacuum filtration for an extended period of time to: a. Remove excess SO 4 2- b. Allow the precipitation to proceed to completion c. Remove as much water as possible d. Allow time to accurately record the data e. Allow the lead sulfate to react with air to form elemental lead Section #1 – These questions are worth two marks each. In order to dial 88, you would have to leave the lab to find a phone. The panic alarm is connected directly to security and by pressing it, you will also be contacting security and EFRT. This is clearly indicated in the safety video. In order to accurately know how much lead you have collected, you need to ensure that the mass recorded is based on lead sulphate and not on a combination of lead sulphate and water.
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2 Continued on next page… ____ 3. A 2.0 g sample of sodium is reacted with excess water. All gaseous products are collected in a 2.0 L sealed vessel at 300. K. What is the pressure inside the vessel? a. 12 atm b. 0.54 atm c. 0.018 atm d. 1.4 atm e. 0.75 atm ____ 4. Which of the following have a reasonable chemical formula and are correctly named ? a. CaF 3 Calcium Flouride b. HCl Hypochlorus acid c. NaO Sodium Oxide d. AsCl 3 Arsenic trichloride e. CrBr 4 Carbon Tetrabromide ____ 5. Given the following empirical formula for a stibazane; C 6 H 5 NSbCl; determine the number of grams of nitrogen contained in a 12.0 g sample of stibazane. a. 0.0258 b. 0.677 c. 5.69 d. 1.98 e. 0.389 2Na(s) + 2H 2 O(l) 2NaOH(aq) + H 2 (g) 2.0 gNa 1 mol 22.990 gNa Λ Ν Μ Ξ Π Ο 1 molH 2 2 molNa Λ Ν Μ Ξ Π Ο = 0.043497 molH 2 PV = nRT P = nRT V P = 0.54 atm a. CaF 2 (calcium fluoride) b. HCl (hydrochloric acid) c. Na 2 O (sodium oxide) d. AsCl 3 (arsenic trichloride – correct) e. CBr 4 (carbon tetrabromide) 12.0 g 1 mol 248.3155 g Λ Ν Μ Ξ Π Ο 1 molN 1 mol Λ Ν Μ Ξ Π Ο 14.007 gN 1 molN Λ Ν Μ Ξ Π Ο = 0.677 g
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3 Continued on next page… ____ 6. A 1.0 L solution of 1.0 M KI is added to 0.500 L of water. What is the new concentration of KI ? a. 2.5 b. 1.0 c. 0.50 d. 0.67 e. 1.5 ____ 7. Which of the following has the largest first ionization energy? a. B b. Be c. N d. O e. C ____ 8. Which of the following statements is/are true ? i. Fluoride ion can substitute for hydroxide ion in tooth enamel ii. Fluorosis is a health benefit of fluorination of municipal water supply iii.Hydronium ion in the mouth causes enamel decay iv.In an Electron Capture Detector, halogenated compounds are selectively detected based on their electron affinity v.Neon lamps are based on ionization energies of noble gases
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This note was uploaded on 12/10/2009 for the course CHEMISTRY Chem 1A03 taught by Professor Lock during the Spring '02 term at McMaster University.

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test 1 - You are writing VERSION 1 of this test Make sure...

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