practice test 1

practice test 1 - Chemistry 112 exam # 1 Short answer &...

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Chemistry 112 exam # 1 Spring 2005 Short answer & multiple choice Write the equilibrium constant expressions for the following equations: CaCO 3 (s) + 2H + (aq) Ca +2 (aq) + CO 2 (aq) + H 2 O(l) 2H 2 O(l) H 3 O + (aq) + OH - (aq) At equilibrium, a chemical system (A) has reached completion (all reactant converted to product) (B) has equal rates for forward and reverse reactions (C) has equal moles of all products and reactants (D) has stopped reacting The radioactive isotope 131 I has a half-life of 8.1 days. If 4.00 μ g of the sample is present now, how much will remain 16.2 days later? (A) 3.0 μ g (B) 2.0 μ g (C) 1.0 μ g (D) 0.5 μ g (E) 0 μ g A mechanism proposed for the reaction 2NO (g) + O 2 (g) 2NO 2 (g) is the following: NO + O 2 NO 3 FAST equilibrium constant = K 1 N O 3 + NO 2 NO 2 SLOW rate constant = k 2 The best expression for the rate law of this reaction, based on the mechanism given, would be (A) rate = K 1 [NO][O 2 ] (D). rate = k 2 K 1 [NO] 2 [O 2 ] (B) rate = k 2 [NO 3 ][NO] (E) rate NO O = [] [ 2 2 2 2 ] (C) rate = −Δ [NO]/ Δ t (F). rate = k 2 [NO 2 ] 2 For the reaction
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practice test 1 - Chemistry 112 exam # 1 Short answer &...

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