January 2006 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
21 What is the oxidation number assigned to manganese in KMnO4?
(1) +7     (3) +3
(2) +2     (4) +4
1 K=+1     O=-2 x 4   Mn=+7
22 Which of the following aqueous solutions is the best conductor of electricity?
(1) 0.10 M CH3OH     (3) 0.10 M NaOH
(2) 1.0 M CH3OH       (4) 1.0 M NaOH
4 not the alcohol, NaOH, base highest concentration
23 One acid-base theory states that an acid is
(1) an H donor         (3) an H+ donor
(2) an H acceptor     (4) an H+ acceptor
3 Acids H+ donor

Bases H+ acceptor

24 Positrons are spontaneously emitted from the nuclei of
(1) potassium-37     (3) nitrogen-16
(2) radium-226        (4) thorium-232
1 Table N Decay Modes
25 The amount of energy released from a fission reaction is much greater than the energy released from a chemical reaction because in a fission reaction
(1) mass is converted into energy
(2) energy is converted into mass
(3) ionic bonds are broken
(4) covalent bonds are broken
1 Nuclear mass is converted to energy
3 O=C=O  4 dots on each oxygen

 

KNOW IT

27 Types of nuclear reactions include fission, fusion, and
(1) single replacement
(2) neutralization
(3) oxidation-reduction
(4) transmutation
4 transmutation- creating one element from another
2 5 carbon chain with -OH on #3

and CH3 on carbon number 2

29 When an atom becomes a positive ion, the radius of the atom
(1) decreases
(2) increases
(3) remains the same
1 positive loses an electron, gets smaller
30 Compared to the freezing point of 1.0 M KCl(aq) at standard pressure, the freezing point of 1.0 M CaCl2(aq) at standard pressure is
(1) lower
(2) higher
(3) the same
1 lower CaCl2 breaks up into 3 ions while KCl breaks up into 2

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

 
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