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

Answer Link Explanations
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
2 Link protons +

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.
1 Link see 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
1 Link see 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
3 Link same group
5 Which element is a liquid at STP?
(1) argon       (3) chlorine
(2) bromine   (4) sulfur
2 Link bromine 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.
2 Link chemical 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
1 Link group 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
4 Link definition 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
1 Link see 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
1 Link A + 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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