(VII) Choose and circle one correct answer. (3pts each) 1) Sodium hypochlorite,
ID: 105012 • Letter: #
Question
(VII) Choose and circle one correct answer. (3pts each) 1) Sodium hypochlorite, NaOCI, is the active ingredient in household bleach. What is the concentration of hypochlorite ion if 20.00 ml. of bleach requires 28.30 mL of 0.500 M HCI to reach the equivalence point? A) 0.208 M C) 0.708 M B) 0.353 M D) 1.21 M Which of the following terms can be used to describe an electrochemical cell in which a spontaneous chemical reaction generates an electric current? 2) I. an electrolytic cell a galvanic ce III a voltaic cell A) onlyI B) only C) only II D) I1 and IIl 3) For a galvanic cell, the cathode has a oxidation nas a sign and is - , A) negative, oxidation B) negative, reduction C) positive, oxidation D) positive, reduction 4) A salt bridge is used to B) determine the direction of the cell reaction A) provide reactants in a fuel cell. C) control whether the cell is electrolytic or galvanic. D allow the ion flow necessary for cell neutrality 5) The chemical system shown below is at equilibrium. Which change in conditions will not result in a spontaneous forward reaction? N2(8)+3 H2g)* 2 NH3(g) Kp-4 10s A) adding a catalyst C) adding more N2 B) adding more H2 D) reducing the volumeExplanation / Answer
1) 0.708 M
M1V1 = M2V2
M1 = 28.30
V1 = 0.500 mL = 0.500 x 10^-3
M2 = ?
V2 = 20.0 mL = 20 x 10 ^-3
M2 = 28.30 x 0.500 x 10 ^-3 / 20.00 x 10 ^-3
M2 = 0.708 M
2) the answer is d
3) negative sign and reduction.as there is gain of electron on cathode while loss of electron or oxidation on anode.
4) it allow the ion flow necessary for cell neutrality.it connects the half cells of galvanic cells and keep maintaining the neutrality.
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