June 2010 Chemistry Regents #41-50

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Questions

AnswerExplanations
41 A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is changed from
(1) 400. K to 200. K    (3) 400.°C to 200.°C
(2) 200. K to 400. K    (4) 200.°C to 400.°C		2volme is directly proportional to KELVIN temperature
42 According to Table F, which compound is soluble in water?
(1) barium phosphate    (3) silver iodide
(2) calcium sulfate         (4) sodium perchlorate		4use Table F
43 Given the equation representing a system at equilibrium:
N2(g) + 3H2(g)<==>2NH3(g) + energy

Which changes occur when the temperature of this system is decreased?
(1) The concentration of H2(g) increases and the concentration of N2(g) increases.
(2) The concentration of H2(g) decreases and the concentration of N2(g) increases.
(3) The concentration of H2(g) decreases and the concentration of NH3(g) decreases.
(4) The concentration of H2(g) decreases and the concentration of NH3(g) increases.

4shift right, reactants decrease and products increase
3unsaturated NOT all single bonds

hydrocarbon= hydrogen and carbon ONLY

2Reduction charge goes down and the electrons are on the more positive side
46 Which metal is more active than H2?
(1) Ag    (3) Cu
(2) Au    (4) Pb		4Above H2 on Table J
47 Given the balanced ionic equation representing the reaction in an operating voltaic cell:
Zn(s) + Cu2+(aq)==> Zn2+(aq) + Cu(s)
The flow of electrons through the external circuit in this cell is from the
(1) Cu anode to the Zn cathode
(2) Cu cathode to the Zn anode
(3) Zn anode to the Cu cathode
(4) Zn cathode to the Cu anode		3lose to gain

Oxidation (anode) to reduction (cathode)

Charge going to charge going down

48 Which laboratory test result can be used to determine if KCl(s) is an electrolyte?
(1) pH of KCl(aq)
(2) pH of KCl(s)
(3) electrical conductivity of KCl(aq)
(4) electrical conductivity of KCl(s)		3electrolytes conduct electricity in water (aq)
49 Which compound is produced when HCl(aq) is neutralized by Ca(OH)2(aq)?
(1) CaCl2   (3) HClO
(2) CaH2     (4) HClO2		1acid and base makes salt and water

Hint  Ca + Cl

50 Which nuclides are used to date the remains of a once-living organism?
(1) C-14 and C-12       (3) I-131 and Xe-131
(2) Co-60 and Co-59   (4) U-238 and Pb-206		1Living is organic, carbon

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

 Questions 51-53 Questions 54-55 Questions 56-58 Questions 59-61 Questions 62-64 Questions 65-68 Questions 69-71 Questions 72-75 Questions 76-79 Questions 80-83

 
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