August 2010 Chemistry Regents #31-40

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

Questions 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-63 Questions 64-66 Questions 67-69 Questions 70-72 Questions 73-74 Questions 75-78 Questions 79-81

 

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Questions

Answer Explanations
2 Isotopes- same number of protons different number of neutrons
2 there are more neutrons in O-17

neutrons 9

protons 8

33 The bond between which two atoms is most polar?
(1) Br and Cl   (3) I and Cl
(2) Br and F    (4) I and F
4 find the largest electronegativity difference Table S

bonds=bend= Bonds compare ElectroNegativity Differences

34 In the formula X2(SO4)3, the X represents a metal. This metal could be located on the
Periodic Table in
(1) Group 1   (3) Group 13
(2) Group 2   (4) Group 14
3 SO4 has a charge of 2- and there are 3 of them=-6

X must have a charge of  +3  (you only have 2 of them)

Group 13

35 At STP, which element is solid, brittle, and a poor conductor of electricity?
(1) Al     (3) Ne
(2) K     (4) S
4 the nonmetal, not Ne it is a gas
2 conservation of mass

what goes in must come out. Subtract.

1 count the atoms=molecular

reduce to lowest whole number ratio=empirical

38 Which element forms an ionic compound when it reacts with lithium?
(1) K    (3) Kr
(2) Fe   (4) Br
4 the nonmetal, not Kr it doesn't react
2 SNAP=symmetrical is nonpolar,  asymmetrical is polar
40 Which compound has both ionic and covalent bonds?
(1) CO2         (3) NaI
(2) CH3OH (4) Na2CO3
4 need a metal for it to be ionic and 2 nonmetals for it to be covalent

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

Questions 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-63 Questions 64-66 Questions 67-69 Questions 70-72 Questions 73-74 Questions 75-78 Questions 79-81

 
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