June 2023 Chemistry Regents Questions 31-40 Question Preview (ID: 62058)

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Which Lewis electron-dot diagram represents an atom of nitrogen in the ground state?

a) 1

b) 2

c) 3

d) 4

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

a) (106.905 u)(51.8) + (108.905 u)(48.2)

b) (106.905 u)(51.8%) + (108.905 u)(48.2%)

c) (106.905 u)(48.2) + (108.905 u)(51.8)

d) (106.905 u)(48.2%) + (108.905 u)(51.8%)

A potassium atom has a mass number of 37. What is the number of neutrons in this atom?

a) 15

b) 18

c) 22

d) 37

A potassium atom has a mass number of 37. What is the number of neutrons in this atom?

a) 0.091%

b) 0.10%

c) 9.1%

d) 10%

Compared to the metals in Period 2, the nonmetals in Period 2 have

a) lower first ionization energies and lower electronegativity values

b) lower first ionization energies and higher electronegativity values

c) higher first ionization energies and lower electronegativity values

d) higher first ionization energies and higher electronegativity values

Which formula represents calcium hydride?

a) CaH

b) CaH2

c) CaOH

d) Ca(OH)2

What is the number of moles in a 78.8-gram sample of MgCO3 (gram-formula mass = 84.3 g/mol)?

a) 0.949 mol

b) 0.935 mol

c) 0.843 mol

d) 1.070 mol

Which type of chemical reaction is represented by the equation?

a) synthesis

b) decomposition

c) single replacement

d) double replacement

Which compound has the strongest intermolecular forces at 60 kPa?

a) ethanoic acid

b) ethanol

c) propanone

d) water

Which particle diagram represents a sample of xenon at STP?

a) 1

b) 2

c) 3

d) 4

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