January 2018 Chemistry Regents Questions 31-40 Question Preview (ID: 59758)

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An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of

a) 2-

b) 2+

c) 3+

d) 3-

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

a) 2-2

b) 2-2-1

c) 2-8

d) 2-8-1

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

a) ((10.01 u)(19.9) + (11.01 u)(80.1)) / 100

b) ((10.01 u)(0.199) + (11.01 u)(0.801)) / 100

c) (10.01 u + 11.01 u) / 2

d) (19.9% + 80.1%) / 2

In which group on the Periodic Table would a nonmetallic element belong if atoms of this element tend to gain two electrons to complete their valence shell?

a) 14

b) 15

c) 16

d) 17

Which trend is observed as the first four elements in Group 17 on the Periodic Table are considered in order of increasing atomic number?

a) Electronegativity increases.

b) First ionization energy decreases.

c) The number of valence electrons increases.

d) The number of electron shells decreases.

What is the number of moles of KF in a 29-gram sample of the compound?

a) 1.0 mol

b) 2.0 mol

c) 0.50 mol

d) 5.0 mol

Which bond is most polar?

a) C-O

b) H-O

c) N-O

d) S-O

Based on Table F, which equation represents a saturated solution having the lowest concentration of Cl- ions?

a) 1

b) 2

c) 3

d) 4

What is the molarity of a solution that contains 0.500 mole of KNO3 dissolved in 0.500-liter of solution?

a) 1.00 M

b) 2.00 M

c) 0.500 M

d) 4.00 M

Compared to sample 1, sample 2 contains

a) molecules with a lower average kinetic energy

b) molecules with a lower average velocity

c) less heat energy

d) more heat energy

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