January 2023 Chemistry Regents Questions 31-40 Question Preview (ID: 61257)

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What is the net charge of a monatomic ion that has 15 protons, 16 neutrons, and 18 electrons?

a) 2+

b) 2-

c) 3+

d) 3-

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

a) (184.95 u)(37.40) + (186.96 u)(62.60)

b) (184.95 u)(0.3740) +1 (186.96 u)(0.6260)

c) ((184.95 u)(37.40) + (186.96 u)(62.60))/2

d) ((184.95 u)(0.3740) + (186.96 u)(0.6260))/2

Which general trend is observed as the elements in Period 2 are considered from left to right?

a) Atomic mass decreases.

b) Melting point increases.

c) Electronegativity increases

d) First ionization energy decreases.

Which formula represents chromium(III) oxide?

a) CrO3

b) Cr3O

c) Cr2O3

d) Cr3O2

What is the mass of KCl produced when 24.51 grams of KClO3 reacts completely to produce 9.60 grams of O2?

a) 5.31 g

b) 14.91 g

c) 34.11 g

d) 43.71 g

Which equation represents conservation of atoms?

a) TiO2 + 2Al → 2Al2O3 + Ti

b) TiO2 + 4Al → 2Al2O3 + Ti

c) 3TiO2 + 2Al → 2Al2O3 + 3Ti

d) 3TiO2 + 4Al → 2Al2O3 + 3Ti

One mole of bromine gas, Br2, has a mass of

a) 35.0 g

b) 70.0 g

c) 79.9 g

d) 159.8 g

Which type of reaction does this equation represent?

a) double replacement

b) decomposition

c) synthesis

d) single replacement

Which statement describes the charge and the radius of the magnesium ion formed when a magnesium atom loses two electrons?

a) The Mg ion is positive and has a radius larger than the Mg atom.

b) The Mg ion is negative and has a radius larger than the Mg atom.

c) The Mg ion is positive and has a radius smaller than the Mg atom.

d) The Mg ion is negative and has a radius smaller than the Mg atom.

An oxide ion, O2-, has the same electron configuration as an atom of which noble gas?

a) helium

b) neon

c) argon

d) krypton

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