January 2010 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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21 The particles in which sample of LiCl(s) have the same average kinetic energy as the particles in a 2.0-mole sample of H2O(l) at 25°C?
(1) 1.0 mol at 75°C
(2) 2.0 mol at 50.°C
(3) 3.0 mol at 25°C
(4) 4.0 mol at 0°C		3Linksame temperature

avg. KE = Temperature

22 Which rigid cylinder contains the same number of gas molecules at STP as a 2.0-liter rigid cylinder containing H2(g) at STP?
(1) 1.0-L cylinder of O2(g)
(2) 2.0-L cylinder of CH4(g)
(3) 1.5-L cylinder of NH3(g)
(4) 4.0-L cylinder of He(g)		2LinkAvagodro's hypothesis, same volumes of gas at same pressure and temp have equal numbers of molecules
23 Hydrogen bonding is a type of
(1) strong covalent bond
(2) weak ionic bond
(3) strong intermolecular force
(4) weak intermolecular force		3Linksee answer
24 The data collected from a laboratory titration are used to calculate the
(1) rate of a chemical reaction
(2) heat of a chemical reaction
(3) concentration of a solution
(4) boiling point of a solution		3LinkMV=MV see Table T
25 When one compound dissolves in water, the only positive ion produced in the solution is H3O+(aq). This compound is classified as
(1) a salt
(2) a hydrocarbon
(3) an Arrhenius acid
(4) an Arrhenius base		3Linkacid H3O+ = H+
26 Which nuclear emission has the greatest mass and the least penetrating power?
(1) an alpha particle (3) a neutron
(2) a beta particle (4) a positron		1Linkalpha most massive, least penetrating, least dangerous
27 Which radioisotope has an atom that emits a particle with a mass number of 0 and a charge of +1?
(1) 3H      (3) 19Ne
(2) 16N    (4) 239Pu		3Linkpositron emitter, B+, decay modes on Table N
28 In which type of reaction do two lighter nuclei combine to form one heavier nucleus?
(1) combustion    (3) nuclear fission
(2) reduction       (4) nuclear fusion		4Linkfusion combining

fission splitting

29 For which compound is the process of dissolving in water exothermic?
(1) NaCl     (3) NH4Cl
(2) NaOH   (4) NH4NO3		2LinkTable I towards the bottom, look for H2O over the arrow, DH must be negative
30 Which quantities must be equal for a chemical reaction at equilibrium?
(1) the activation energies of the forward and reverse reactions
(2) the rates of the forward and reverse reactions
(3) the concentrations of the reactants and products
(4) the potential energies of the reactants and products		2Linkconcentrations constant, rates are equal

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 
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