June 2022  Chemistry Regents #31-35

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-65 Questions 66-70 Questions 71-73 Questions 74-77 Questions 78-82 Questions 83-85

   

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Questions

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Explanations
31 Which electron configuration represents the electrons of a phosphorus atom in an excited state?

(1) 2-8-5

(2) 2-8-6

(3) 2-7-6

(4) 2-7-4

 2   ground state P on the periodic table

2-8-5  so 15 electrons

excited state promotes 1 or more electrons to a higher level

2-7-6  excited
32 A 26.7-gram sample of which element has a volume of 3.00 cubic centimeters at room temperature?

(1) Cr

(2) Cd

(3) Nb

(4) Ni

 4   density question

determine the density  26.7g/3.00cm3

d=8.90g/cm3

table S match the densities

Ni=8.90
33 Which element is a nonmetal and solid at STP?

(1) lead         (3) sodium

(2) nitrogen    (4) sulfur

 4   1 and 3 are metals...OUT

nitrogen is a gas at STP..OUT

 

34 what is the molecular formula for CH3CH2COOCH3?

(1) C2H4O

(2) C2H4O2

(3) C4H8O

(4) C4H8O2

 4    CH3CH2COOCH3

consolidate but DO NOT reduce

(that is the empirical formula)

C4H8O2

 
35 A substance conducts electricity in the liquid phase but not in the solid phase. This substance can be classified as

(1) covalent

(2) ionic

(3) metallic

(4) molecular

 2   property of an ionic compound

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51-53 Questions 54-56 Questions 57-58 Questions 59-60 Questions 61-65 Questions 66-70 Questions 71-73 Questions 74-77 Questions 78-82 Questions 83-85  

 
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