August 2002 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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Answer Explanations
21 The spontaneous decay of an atom is called
(1) ionization        (3) combustion
(2) crystallization  (4) transmutation
4 definition of transmutation
22 In any redox reaction, the substance that undergoes reduction will
(1) lose electrons and have a decrease in oxidation number
(2) lose electrons and have an increase in oxidation number
(3) gain electrons and have a decrease in oxidation number
(4) gain electrons and have an increase in oxidation number
3 reduction charge goes down, gain electrons (GER)
23 Which electron configuration is correct for a sodium ion?
(1) 2–7      (3) 2–8–1
(2) 2–8      (4) 2–8–2
2 ION- lose an electron 2-8
24 In which equation does the term "heat" represent heat of fusion?
(1) NaCl(s) + heat -->NaCl(l)
(2) NaOH(aq) + HCl(aq) -->NaCl(aq) + H2O(l) + heat
(3) H2O(l) + heat --> H2O(g)
(4) H2O(l) + HCl(g) -->H3O+(aq) + Cl-(aq) + heat
1 fusion is melting, solid to liquid
25 Which substance is an Arrhenius acid?
(1) LiF(aq)      (3) Mg(OH)2(aq)
(2) HBr(aq)     (4) CH3CHO
2 acids start with H+
26 Which type of emission has the highest penetrating power?
(1) alpha      (3) positron
(2) beta        (4) gamma
4 gamma most penetrating then beta then alpha
27 As the elements in Group 17 are considered in order of increasing atomic number, the chemical reactivity of each successive element
(1) decreases
(2) increases
(3) remains the same
1 nonmetals fluorine is most reactive (top right)
28 As the pressure on the surface of a liquid decreases, the temperature at which the liquid will boil
(1) decreases
(2) increases
(3) remains the same
1 less pressure lower BP, table H
29 As a Ca atom undergoes oxidation to Ca2+, the number of neutrons in its nucleus
(1) decreases
(2) increases
(3) remains the same
3 lose electrons not neutrons
30 As the temperature of a liquid increases, its vapor pressure
(1) decreases
(2) increases
(3) remains the same
2 Table H

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