August 2005 Chemistry Regents #1-10
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1 Which subatomic particle has a negative charge?
(1) proton (3) neutron
(2) electron (4) positron
|2||electrons = neg
proton = +
neutron= no charge
|2 Which statement best describes the nucleus of an
(1) It has a charge of +13 and is surrounded by a total of 10 electrons.
(2) It has a charge of +13 and is surrounded by a total of 13 electrons.
(3) It has a charge of –13 and is surrounded by a total of 10 electrons.
(4) It has a charge of –13 and is surrounded by a total of 13 electrons.
|2||nucleus protons only charge= 13
atom proton =electrons
|3 The atomic mass of an element is the weighted
average of the
(1) number of protons in the isotopes of that element
(2) number of neutrons in the isotopes of that element
(3) atomic numbers of the naturally occurring isotopes of that element
(4) atomic masses of the naturally occurring isotopes of that element
|4 In which pair do the particles have approximately
the same mass?
(1) proton and electron
(2) proton and neutron
(3) neutron and electron
(4) neutron and beta particle
|2||proton, neutrons =1 amu each
electrons =1/1836 amu
|5 Two different samples decompose when heated.
Only one of the samples is soluble in water. Based
on this information, these two samples are
(1) both the same element
(2) two different elements
(3) both the same compound
(4) two different compounds
|6 The elements located in the lower left corner of
the Periodic Table are classified as
(1) metals (3) metalloids
(2) nonmetals (4) noble gases
|1||metals= bottom left
nonmetals = top right
|7 Which of these elements has the lowest melting
(1) Li (3) K
(2) Na (4) Rb
|4||see table S|
|8 Which list consists of elements that have the most
similar chemical properties?
(1) Mg, Al, and Si (3) K, Al, and Ni
(2) Mg, Ca, and Ba (4) K, Ca, and Ga
|9 The correct chemical formula for iron(II) sulfide
(1) FeS (3) FeSO4
(2) Fe2S3 (4) Fe2(SO4)3
|10 Which list consists of types of chemical formulas?
(1) atoms, ions, molecules
(2) metals, nonmetals, metalloids
(3) empirical, molecular, structural
(4) synthesis, decomposition, neutralization
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