January 2010 Chemistry Regents #1-10

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 

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Questions

AnswerLinkExplanations
1 Which two particles have opposite charges?
(1) an electron and a neutron
(2) an electron and a proton
(3) a proton and a neutron
(4) a proton and a positron		2Linkprotons +

electrons -

2 Which statement describes how an atom in the ground state becomes excited?
(1) The atom absorbs energy, and one or more electrons move to a higher electron shell.
(2) The atom absorbs energy, and one or more electrons move to a lower electron shell.
(3) The atom releases energy, and one or more electrons move to a higher electron shell.
(4) The atom releases energy, and one or more electrons move to a lower electron shell.		1Linksee answer
3 An element that has a low first ionization energy and good conductivity of heat and electricity is classified as a
(1) metal         (3) nonmetal
(2) metalloid    (4) noble gas		1Linksee table S then use the PT to see location
4 The chemical properties of calcium are most similar to the chemical properties of
(1) Ar     (3) Mg
(2) K      (4) Sc		3Linksame group
5 Which element is a liquid at STP?
(1) argon       (3) chlorine
(2) bromine   (4) sulfur		2Linkbromine and mercury are the only liquids
6 Which statement describes a chemical property of aluminum?
(1) Aluminum is malleable.
(2) Aluminum reacts with sulfuric acid.
(3) Aluminum conducts an electric current.
(4) Aluminum has a density of 2.698 g/cm3 at STP.		2Linkchemical properties look for the reaction
7 Which element has an atom in the ground state with a total of three valence electrons?
(1) aluminum     (3) phosphorus
(2) lithium          (4) scandium		1Linkgroup 13, use PT, last number of electrons
8 Which substance can be broken down by chemical means?
(1) magnesium     (3) mercury
(2) manganese     (4) methanol		4Linkdefinition of a compound

3 wrong answers are elements

9 The gram-formula mass of NO2 is defined as the mass of
(1) one mole of NO2
(2) one molecule of NO2
(3) two moles of NO
(4) two molecules of NO		1Linksee answer
10 In which type of reaction do two or more substances combine to produce a single substance?
(1) synthesis
(2) decomposition
(3) single replacement
(4) double replacement		1LinkA + B ==> AB

synthesis

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 
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