August 2019 Chemistry Regents Questions 31-40 Question Preview (ID: 59716)

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Which elements are present in this mixture?

a) A and X

b) A and Z

c) D and X

d) D and Z

Which electron confi guration represents the electrons in an atom of sulfur in an excited state?

a) 2-8-6

b) 2-7-7

c) 2-8-7

d) 2-7-8

Which notations represent atoms that have the same number of protons but a different number of neutrons?

a) H-3 and He-3

b) S-32 and S-32

c) Cl-35 and Cl-37

d) Ga-70 and Ge-73

What is the chemical name of the compound NH 4SCN?

a) ammonium thiocyanate

b) ammonium cyanide

c) nitrogen hydrogen cyanide

d) nitrogen hydrogen sulfate

Which equation represents a conservation of atoms?

a) 2Fe + 2O2 → Fe2O3

b) 2Fe + 3O2 → Fe2O3

c) 4Fe + 2O2 → 2Fe2O3

d) 4Fe + 3O2 → 2Fe2O3

Which compound has covalent bonds?

a) H2O

b) Li2O

c) Na2O

d) K2O

Which particle diagram represents a sample of oxygen gas at STP?

a) 1

b) 2

c) 3

d) 4

At which temperature and pressure will a sample of neon gas behave most like an ideal gas?

a) 300. K and 2.0 atm

b) 300. K and 4.0 atm

c) 500. K and 2.0 atm

d) 500. K and 4.0 atm

What is the molarity of 2.0 liters of an aqueous solution that contains 0.50 mole of potassium iodide, KI?

a) 1.0 M

b) 2.0 M

c) 0.25 M

d) 0.50 M

Which two samples contain the same number of molecules?

a) 1 and 2

b) 1 and 3

c) 2 and 3

d) 2 and 4

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