August 2009 Chemistry Regents #1-10
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|4||beta= 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
|3||masses, % 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
|1||Atom 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
|1||goes 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.
|3||they are chemically different, in structure and properties|
|6 Which statement describes a chemical property
(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.
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
(3) total number of protons
(4) total number of valence electrons
|4||same group same # valence electrons|
|8 Which type of matter is composed of two or
more elements that are chemically combined in
a fixed proportion?
(3) homogeneous mixture
(4) heterogeneous mixture
|2||definition 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
|1||ionic, 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.
Symmertrical is Nonpolar, Asymmertical is Polar
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