August 2022 Chemistry Regents Questions 31-40 Question Preview (ID: 61272)

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Which two elements are present in this mixture?

a) A and Q

b) A and E

c) G and Q

d) G and E

What is the approximate mass of an atom that has 10 electrons, 10 protons, and 9 neutrons?

a) 10. u

b) 19 u

c) 20. u

d) 29 u

Which electron configuration represents the electrons of an atom in an excited state?

a) 2-7-3

b) 2-8-2

c) 2-8-8-1

d) 2-8-9-2

Which numerical setup can be used to determine the atomic mass of bromine?

a) (78.92 u)(50.69) + (80.92 u)(49.31)

b) (80.92 u)(50.69) + (78.92 u)(49.31)

c) (78.92 u)(0.5069) + (80.92 u)(0.4931)

d) (80.92 u)(0.5069) + (78.92 u)(0.4931)

What is a chemical name of the compound CuS?

a) copper(I) sulfide

b) copper(I) sulfate

c) copper(II) sulfide

d) copper(II) sulfate

What is the mass of N2(g) produced when 1.0 gram of H2(g) completely reacts with 15.0 grams of NO(g) to produce 9.0 grams of H2O(g)?

a) 7.0 g

b) 14.0 g

c) 25.0 g

d) 28.0 g

An atom of which element bonds with an atom of hydrogen to form the most polar bond?

a) bromine

b) chlorine

c) fluorine

d) iodine

Which types of matter are represented by X and Z in the diagram?

a) X is mixture, and Z is substance.

b) X is substance, and Z is mixture.

c) X is element, and Z is compound.

d) X is compound, and Z is element.

Based on Table G, which sample, when added to 100. grams of water and thoroughly stirred, produces a heterogeneous mixture at 20.°C?

a) 20. g of KCl

b) 20. g of KI

c) 80. g of KCl

d) 80. g of KI

How many milliliters of 1 M HCl(aq) must be diluted with water to make exactly 500 mL of 0.1 M HCl(aq)?

a) 10 mL

b) 50 mL

c) 100 mL

d) 5000 mL

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