Chem 1331 - final (better)

Chem 1331 - final (better) - View Attempt 1 of 16...

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1. Magnesium oxide (MgO) forms when the metal burns in air. If 1.25 g of MgO contains 0.754 g of Mg, what is the mass ratio of magnesium to oxygen in the compound? Student Response Value Correct Answer Feedback a. 1.52 100% b. 1.66 0% c. 0.603 0% d. 0.340 0% e. 2.52 0% f. 0.659 0% Score: 1/1 2. Naturally occurring argon consists of three isotopes, the atoms of which occur in the following abundances: 0.34% 36 Ar (35.9676 amu), 0.07% 38 Ar (37.9627 amu), and 99.59% 40 Ar (39.9624 amu). The calculated atomic weight of argon is: Student Response Value Correct Answer Feedback a. 39.95 amu 100% b. 37.96 amu 0% c. 38.96 amu 0% d. 39.64 amu 0% e. none of the above 0% Score: 1/1 3.
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What is the sum of the numbers of neutrons and electrons in the ion 207 Po 3- ? Student Response Value Correct Answer Answer 210 100% 210 Score: 1/1 4. The formula of calcium oxide is CaO. What is the formula of the ionic compound containing calcium and sulfate ions? Student Response Value Correct Answer Feedback a. CaSO 4 100% b. Ca 2 SO 4 0% c. Ca 3 (SO 4 ) 2 0% d. Ca 2 (SO 4 ) 3 0% e. none of these 0% Score: 1/1 5. Give formulas for the following compounds: chlorine trifluoride and pentaphosphorus heptasulfide Student Response Value Correct Answer Feedback a. ClF 3 , 5PS 7 0% b. ClF 3 , P 5 S 7 100% c. Cl 3 F, P 3 S 9 0% d. Cl 3 F 3 , P 5 S 7 0% e. ClF 3 , PO 5 S 7 0% Score: 1/1 View Attempt https://scholar.uh.edu/webct/urw/lc222453510.tp222453522/ViewStudent... 2 of 16 12/14/2008 10:01 PM
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6. What is the empirical formula and empirical formula mass for the following compound? gallium(III) sulfate Student Response Value Correct Answer Feedback a. Ga 2 (SO 4 ) 3 , 427 g/mol 100% b. Ga(SO 4 ) 2 , 262 g/mol 0% c. Ga(SO 4 ) 1.5 , 214 g/mol 0% d. Ga 2 (SO 4 ) 3 , 363 g/mol 0% e. Ga(SO 4 ) 3 , 358 g/mol 0% Score: 0/1 7. What volume of 0.150 M AgNO 3 solution is required to react with excess KCl(aq) to yield 37.5 g of silver chloride? Student Response Value Correct Answer Feedback a. 570 mL 0% b. 1.70 L 100% c. 2.60 L 0% d. 3.30 L 0% e. 3.66 L 0% Score: 1/1 8. Sodium phosphate (Na 3 PO 4 ) reacts with HCl to form H 3 PO 4 and NaCl. How many liters of 0.1 M HCl are required to react with 0.1 mole of sodium phosphate? Student Response Value Correct Answer Feedback a. 0.3 L 0% View Attempt https://scholar.uh.edu/webct/urw/lc222453510.tp222453522/ViewStudent... 3 of 16 12/14/2008 10:01 PM
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b. 0.6 L 0% c. 1.0 L 0% d. 3.0 L 100% Your choices were: A. 0.3 L B. 0.6 L C. 1.0 L D. 3.0 L Score: 1/1 9. How many moles of H + ions are present in the following aqueous solution? 1,796 mL of 0.87 M nitric acid Student Response Value Correct Answer Answer 1.563 100% 1.56 Score: 1/1 10.
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