August 2009 Chemistry Regents #1-10

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-55 Questions56-58 Questions 59-63 Question 64 Questions 65-67 Questions 68-72 Questions 73-76 Questions 77-79 Questions 80-81

 

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AnswerExplanations
4beta= an electron   1/1836 amu (almost zero)

see the zero in #4

2 What information is necessary to determine the atomic mass of the element chlorine?
(1) the atomic mass of each artificially produced isotope of chlorine, only
(2) the relative abundance of each naturally occurring isotope of chlorine, only
(3) the atomic mass and the relative abundance of each naturally occurring isotope of chlorine
(4) the atomic mass and the relative abundance of each naturally occurring and artificially produced isotope of chlorine		3masses, % of natural isotopes
3 In an atom of argon-40, the number of protons
(1) equals the number of electrons
(2) equals the number of neutrons
(3) is less than the number of electrons
(4) is greater than the number of electrons		1Atom protons equals electrons
4 An electron in a sodium atom moves from the third shell to the fourth shell. This change is a result of the atom
(1) absorbing energy    (3) gaining an electron
(2) releasing energy    (4) losing an electron		1goes to a higher energy level, it absorbs energy
5 Which statement describes oxygen gas, O2(g), and ozone gas, O3(g)?
(1) They have different molecular structures, only.
(2) They have different properties, only.
(3) They have different molecular structures and different properties.
(4) They have the same molecular structure and the same properties.		3they are chemically different, in structure and properties
6 Which statement describes a chemical property of bromine?
(1) Bromine is soluble in water.
(2) Bromine has a reddish-brown color.
(3) Bromine combines with aluminum to produce AlBr3.
(4) Bromine changes from a liquid to a gas at 332 K and 1 atm.		3chemical=reactions

physical are phase changes (including dissolving)

7 An atom of aluminum in the ground state and an atom of gallium in the ground state have the same
(1) mass
(2) electronegativity
(3) total number of protons
(4) total number of valence electrons		4same group same # valence electrons
8 Which type of matter is composed of two or more elements that are chemically combined in a fixed proportion?
(1) solution
(2) compound
(3) homogeneous mixture
(4) heterogeneous mixture		2definition of compound
9 Which type of substance can conduct electricity in the liquid phase but not in the solid phase?
(1) ionic compound
(2) molecular compound
(3) metallic element
(4) nonmetallic element		1ionic, moving charge is electricity
10 Why is a molecule of CO2 nonpolar even though the bonds between the carbon atom and the oxygen atoms are polar?
(1) The shape of the CO2 molecule is symmetrical.
(2) The shape of the CO2 molecule is asymmetrical.
(3) The CO2 molecule has a deficiency of electrons.
(4) The CO2 molecule has an excess of electrons.		1SNAP

Symmertrical is Nonpolar, Asymmertical is Polar

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-55 Questions56-58 Questions 59-63 Question 64 Questions 65-67 Questions 68-72 Questions 73-76 Questions 77-79 Questions 80-81

 
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