January 2006 Chemistry Regents #11-20
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Other Regents Exams
11 Compared to a calcium atom, the calcium ion
(1) more protons (3) more electrons
(2) fewer protons (4) fewer electrons
|4||2+ has lost 2 electrons|
|12 Which type of bond is found in sodium bromide?
(1) covalent (3) ionic
(2) hydrogen (4) metallic
|3||ionic, metal and nonmetal|
|13 Which substance can not be decomposed by
ordinary chemical means?
(1) methane (3) ethanol
(2) mercury (4) ammonia
|2||definition of an element|
|14 A mixture of crystals of salt and sugar is added to
water and stirred until all solids have dissolved.
Which statement best describes the resulting
(1) The mixture is homogeneous and can be separated by filtration.
(2) The mixture is homogeneous and cannot be separated by filtration.
(3) The mixture is heterogeneous and can be separated by filtration.
(4) The mixture is heterogeneous and cannot be separated by filtration.
|2||solutions are homogeneous mixtures and can not be separated by filtering|
|15 Under which conditions of temperature and
pressure would a sample of H2(g) behave most
like an ideal gas?
(1) 0°C and 100 kPa
(2) 0°C and 300 kPa
(3) 150°C and 100 kPa
(4) 150°C and 300 kPa
|3||ideal gas=ideal vacation
high temp low pressures
|16 In a chemical reaction, the difference between
the potential energy of the products and the
potential energy of the reactants is defined as the
(1) activation energy
(2) ionization energy
(3) heat of reaction
(4) heat of vaporization
DH=Heat of Reaction
Title of Table I
|17 Which substance is an Arrhenius base?
(1) KCl (3) KOH
(2) CH3Cl (4) CH3OH
|3||OH-, so KOH
never organic (CH3OH) alcohol
|18 Given the balanced equation:
I2(s) + energy ==> I2(g)
As a sample of I2(s) sublimes to I2(g), the entropy of the sample
(1) increases because the particles are less randomly arranged
(2) increases because the particles are more randomly arranged
(3) decreases because the particles are less randomly arranged
(4) decreases because the particles are more randomly arranged
|2||solid lowest entropy
gas highest entropy
|19 The multiple covalent bond in a molecule of
1-butene is a
(1) double covalent bond that has 6 shared electrons
(2) double covalent bond that has 4 shared electrons
(3) triple covalent bond that has 6 shared electrons
(4) triple covalent bond that has 4 shared electrons
|2||-ene = double bond, share 4 electrons between carbons|
|20 In an oxidation-reduction reaction, reduction is
defined as the
(1) loss of protons (3) loss of electrons
(2) gain of protons (4) gain of electrons
|4||LEO-lose electrons oxidation
GER-gain electrons reduction
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