June 2016  Chemistry Regents #31-35

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31 Which notations represent hydrogen isotopes?

1 isotopes-same number of protons (atomic number...bottom)

Different number of neutrons (mass number is protons and neutrons... top)

32 Naturally occurring gallium is a mixture of isotopes that contains 60.11% Ga-69 (atomic mass = 68.93 u) and 39.89% of Ga-71 (atomic mass = 70.92 u). Which numerical setup can be used to determine the atomic mass of naturally occurring gallium?

3 weighted average= mass*%..(as a decimal)  +mass*%..(as a decimal )
33 Which list of symbols represents nonmetals, only?

(1) B, Al, Ga               (3)  C,  Si,  Ge

(2)  Li,  Be,  B            (4) P,  S,  Cl

4 all need to be from the top right of the periodic table.  Above the staircase

 

34  In the formula XSO4, the symbol X could represent the element

(1)  Al      (3)   Mg

(2)  Ar      (4)  Na

3 since SO4 is 2-  X must be 2+

look at group 2...Mg

35 What is the chemical formula for lead(IV) oxide?

(1)  PbO2      (2)   Pb2O

(3)  PbO4      (4)  Pb4O

1 lead(IV) oxide

Pb4+   O2-

PbO2

 

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

Question 51 Questions 52-53 Questions 54-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74  Questions 75-77  Questions 78-81  Questions 82-85

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