June 2006 Chemistry Regents #21-30

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

 

Questions

Answer Explanations
21 Which factors must be equal in a reversible 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
2 equilibrium

concentration constant

rates are equal

22 The compounds CH3OCH3 and CH3CH2OH are isomers of each other. These two compounds must have the same
(1) density      (3) melting point
(2) reactivity   (4) molecular formula
4 same formula different structure
23 Which balanced equation represents a redox reaction?
(1) AgNO3 + NaCl ==>AgCl + NaNO3
(2) BaCl2 + K2CO3 ==> BaCO3 + 2KCl
(3) CuO + CO==> Cu + CO2
(4) HCl + KOH ==> KCl + H2O
3 look for the free element
24 Which process occurs at the anode in an electrochemical cell?
(1) the loss of protons
(2) the loss of electrons
(3) the gain of protons
(4) the gain of electrons
2 An OX, LEO lose electrons

Red Cat, GER gain electrons

25 Which substance is an electrolyte?
(1) CH3OH     (3) H2O
(2) C6H12O6   (4) KOH
4 electrolytes are acids bases and salts

KOH is a base

26 Which ion is the only negative ion present in an aqueous solution of an Arrhenius base?
(1) hydride ion     (3) hydronium ion
(2) hydrogen ion  (4) hydroxide ion
4 OH- hydroxide
27 According to Reference Table N, which pair of isotopes spontaneously decays?
(1) C-12 and N-14   (3) C-14 and N-14
(2) C-12 and N-16   (4) C-14 and N-16
4 the ones actually on that Table
1 Table N

it is an alpha decay

29 Which type of reaction converts one element to another element?
(1) neutralization     (3) substitution
(2) polymerization  (4) transmutation
4 definition of transmutation
1 alpha is the heaviest

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

 
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