June 2018 Chemistry Regents Questions 31-40 Question Preview (ID: 59753)

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Which elements are present in this mixture?

a) D and A

b) D and Z

c) X and A

d) X and Z

Each line in the spectra represents the energy

a) absorbed as an atom loses an electron

b) absorbed as an atom gains an electron

c) released as an electron moves from a lower energy state to a higher energy state

d) released as an electron moves from a higher energy state to a lower energy state

Which ion has a charge of 2-?

a) A

b) E

c) G

d) J

What is the approximate mass of an atom that contains 26 protons, 26 electrons and 19 neutrons?

a) 26 u

b) 45 u

c) 52 u

d) 71 u

Which electron configuration represents a potassium atom in an excited state?

a) 2-7-6

b) 2-8-5

c) 2-8-8-1

d) 2-8-7-2

What is the total number of neutrons in an atom of K-42?

a) 19

b) 20

c) 23

d) 42

What is the number of moles of C that must completely react to produce 2.0 moles of C2H6?

a) 1.0 mol

b) 2.0 mol

c) 3.0 mol

d) 4.0 mol

Which type of chemical reaction is represented by the equation?

a) synthesis

b) decomposition

c) single replacement

d) double replacement

Based on this table, which statement describes how two of these elements can be differentiated from each other?

a) Gold can be differentiated from tungsten based on density.

b) Gold can be differentiated from sodium based on malleability.

c) Sodium can be differentiated from tungsten based on conductivity.

d) Sodium can be differentiated from iodine based on malleability.

Which particle diagram represents a mixture?

a) 1

b) 2

c) 3

d) 4

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