chem 105 final review quesitons

chem 105 final review quesitons - 1. Which of the following...

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1. Which of the following is true about net ionic equations? a. all ions in the solution are included in the equation, even if they don’t react b. the charges on each side always add up to +1 c. the charges on each side always add up to -1 d. the charges on each side always balance e. only spectator ions are written 2. Dioxygen has the molecular orbital energy level diagram shown below. The total number of electrons in the molecule is 12. Identify the LUMO and if oxygen is paramagnetic or diamagnetic. __ sigma * 2p __ __ pi* 2p __ __ pi 2p __ sigma 2p __ sigma* 2s __ sigma 2s a. sigma* 2p ; paramagnetic b. pi* 2p ; diamagnetic c. pi* 2p ; paramagnetic d. sigma 2s ; paramagnetic e. no LUMO can be identified from the given information; diamagnetic 3. 142 g aqueous sodium sulfate reacts with aqueous barium nitrate to produce 150 g barium sulfate solid. Identify the precipitate and the limiting reactant, respectively. a. sulfate ion; barium nitrate b. barium sulfate; barium nitrate c. barium nitrate; barium nitrate d. sodium sulfate; barium sulfate e. no precipitate; sodium sulfate 4. In the complete combustion of 78 g benzene with excess oxygen, only 36 g H 2 O are produced. What is the percent yield for this reaction? a. 67% b. 46% c. 100% d. 73% e. 49% 5. When sulfurous acid reacts with sodium bicarbonate, what is the conjugate acid in the equation?
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a. sulfurous ion b. sulfurous acid c. carbonic acid d. hydrogen sulfate e. sodium hydride 6. When 400 g potassium chromate reacts with barium chloride, potassium chloride and 250 g barium chromate are formed. What is the limiting reactant? a. potassium chromate b. barium chromate c. barium chloride d. potassium chloride 7. Which of the following has the highest ratio of sigma bonds to pi bonds: benzene, H 3 CCH=O, H 2 C=C=O? a. benzene b. H 3 CCH=O c. H 2 C=C=O d. they all have the same number of sigma bonds and pi bonds 8. How many hydrogen atoms are found in 750 g in sodium sulfate hexahydrate? a. 1.1 x 10 25 b. 2.2 x 10 25 c. 36 x 10 23 d. 3.0 x 10 23 9. How many grams of oxygen are required to completely combust 2 moles of methanol? a. 96 g b. 48 g c. 3 mol d. 188 g e. 2 mol 10. When put in water, which of the following is not an electrolyte? a. hydrochloric acid b. acetate ion c. sodium chloride d. benzene
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11. The pOH of a 0.3M solution of hydrofluoric acid is a. greater than 3 and less than 7 b. Between 1 and 0 c. 10 d. 3 e. Greater than 13 and less than 14 12. How many mL of 0.500 M sulfuric acid are required to titrate 5.0 mL of 0.250 M sodium hydroxide to the equivalence point? a. 400 mL b. 2.50 mL c. 1.25 mL d. 800 mL 13. Magnesium nitrate is a strong electrolyte in water. Approximately, what is the molarity of magnesium nitrate, magnesium ion, and nitrate ion when 50 g of magnesium nitrate is dissolved in water to give 10 L of solution? a.
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This note was uploaded on 11/04/2011 for the course CHEM 105 taught by Professor Macedone during the Fall '07 term at BYU.

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chem 105 final review quesitons - 1. Which of the following...

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