August 2008 Chemistry Regents #21-30

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

 

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Questions

Answer Explanations
2 Longest chain 5 carbons single bonded=  pentane

1 carbon side chain= methyl

22 A voltaic cell spontaneously converts chemical energy to
(1) electrical energy      (3) mechanical energy
(2) geothermal energy  (4) nuclear energy
1 voltaic cells are batteries
23 Given the balanced equation representing a reaction:
Mg(s) + Ni2+(aq) ==> Mg2+(aq) + Ni(s)
What is the total number of moles of electrons lost by Mg(s) when 2.0 moles of electrons are gained by Ni2+(aq)?
(1) 1.0 mol   (3) 3.0 mol
(2) 2.0 mol    (4) 4.0 mol
2 moles of electrons lost=moles of electrons gained

 

24 Which half-reaction correctly represents reduction?
(1) Mn4+ ==> Mn3+ + e-
(2) Mn4+ ==>Mn7+ + 3e-
(3) Mn4+ + e- ==>Mn3+
(4) Mn4+ + 3e- ==> Mn7+
3 charge goes down and electrons go on the more positive side
25 Which indicator is blue in a solution that has a pH of 5.6?
(1) bromcresol green   (3) methyl orange
(2) bromthymol blue    (4) thymol blue
1 Table M
26 The Arrhenius theory explains the behavior of
(1) acids and bases
(2) alcohols and amines
(3) isomers and isotopes
(4) metals and nonmetals
1 Arrhenius acid base theory (25-27 are acid base questions)
27 In which laboratory process could a student use 0.10 M NaOH(aq) to determine the concentration of an aqueous solution of HBr?
(1) chromatography
(2) decomposition of the solute
(3) evaporation of the solvent
(4) titration
4 Titrations Definition
28 A nuclear reaction in which two light nuclei combine to form a more massive nucleus is called
(1) addition    (3) fusion
(2) fission       (4) substitution
3 definition of Fusion
29 The nucleus of a radium-226 atom is unstable, which causes the nucleus to spontaneously
(1) absorb electrons   (3) decay
(2) absorb protons     (4) oxidize
3 radioactive nuclei will decay
30 A serious risk factor associated with the operation of a nuclear power plant is the production of
(1) acid rain
(2) helium gas
(3) greenhouse gases, such as CO2
(4) radioisotopes with long half-lives
4 pick the bad one, that has to do with radiation

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

 
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