August 2023 Chemistry Regents 31-40 Question Preview (ID: 62041)

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What is represented by diagram 2?

a) a positive ion of hydrogen

b) a negative ion of hydrogen

c) an atom of hydrogen in an excited state

d) an atom of hydrogen in the ground state

Which numerical setup can be used to calculate the atomic mass of the element copper?

a) (62.93 u)(30.85) + (64.93 u)(69.15)

b) (62.93 u)(69.15) + (64.93 u)(30.85)

c) (62.93 u)(0.3085) + (64.93 u)(0.6915)

d) (62.93 u)(0.6915) + (64.93 u)(0.3085)

Which subatomic particles were discovered as the result of experiments with cathode ray tubes?

a) electrons

b) neutrons

c) positrons

d) protons

Which change in electron location in an atom of calcium is accompanied by the greatest amount of energy emitted?

a) from shell 1 to shell 2

b) from shell 2 to shell 1

c) from shell 1 to shell 4

d) from shell 4 to shell 1

As the atomic number increases in Group 2 from Be to Ba, the first ionization energy

a) decreases, and the atomic radius decreases

b) decreases, and the atomic radius increases

c) increases, and the atomic radius decreases

d) increases, and the atomic radius increases

What is the mass of Mg3N2 that is produced when 14.58 grams of magnesium completely reacts with 5.60 grams of nitrogen?

a) 8.98 g

b) 10.46 g

c) 20.18 g

d) 49.34 g

Which Lewis electron-dot diagram represents a molecule of H2S?

a) 1

b) 2

c) 3

d) 4

What is the vapor pressure of water at 90.°C?

a) 40. kPa

b) 68 kPa

c) 94 kPa

d) 150. kPa

A sample is composed of two different substances that can be separated by using filter paper. This sample is classified as

a) a heterogeneous mixture

b) a homogeneous mixture

c) a single compound

d) an unsaturated solution

Which solutions react to produce an insoluble compound?

a) KCl(aq) +LiCl(aq) →

b) LiCl(aq) + NaNO3 (aq) →

c) NaCl (aq) + AgClO3 (aq) →

d) KNO3 (aq) + AgClO3(aq) →

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