Chem 201 Final Exam Study Guide

Chem 201 Final Exam Study Guide
any pure substance that is not a mixture and is not a compound must be an
element
the elements that comprise a compound can only be separated from one another by a
chemical reaction
which of the following is an example of a semi metal or matalloid?
a)phosphorus
b)selenium
c)tellurium
d)gallium
e)all of the above
tellurium
matter is anything that
has mass and occupies space
the spontaneous emission of radiation from an unstable nucleus is called
radioactivity
the number of neutrons in uranium-235 is
a)3
b)92
c)142
d)145
e)none of the above
none of the above
the atomic mass of an element represents
the weighted average of the mass of the naturally occurring isotopes
the molar mass of of NaCl is equal to
a)the mass of one mole of NaCl
b)the mass of 6.02 x 10²³ formula units of NaCl
c)the mass of 6.02 x 10²³ atoms of sodium plus 6.02 x 10²³ atoms of chlorine
d) 58.443g per mole
e)all of the above
all of the above
what is the density of a material whose volume is 100.0cm³ and mass is 98.0g?
9.80g/cm³
which of the following is an alkali earth ion?
a)Ca²âº
b)Mn³âº
c)P³â»
d)none of the above
Ca²âº
the mass number of an element represents
the sum of the number of protons and neutrons
what is the cation found in the compound magnesium hydroxide?
Mg²âº
some liquid in a jar can be separated by physical means into two separate liquids, which
can then be separated no further. the liquid is a:
mixture
the rutherford gold foil experiment proved that the atom contained:
electrons
for the chemical reaction NH₃+HCL→NHâ‚„CL, what is the limiting reactant when 6.8g if
NH₃ and 4.7g of HCl are mixed?
HCl
the halogens are found in which group?
7A
which of the following processes is endothermic?
a)formation of dew on a cold day
b)sublimation of dry ice
c)deposition of frost on grass
d)all of the above
sublimation of dry ice
the volume of a gas will an increase with in
a)T
b)V
c)n
d)all of the above
all of the above
a function or property whose value depends on only the present state of the system and
not on the path used to arrive there is called
a state function
kinetic molecular theory states that
the average kinetic energy of gas particles increases with temperature
the amount of internal energy transferred from one object to another as a result of
temperature difference is
heat
in the context of chemistry, the system is defined as
the reactants and products of a reaction
at a given temperature, less massive gases move
more quickly than heavier ones
the amount of energy required to completely transform a mole of a substance from the
solid phase to the liquid phase is called
enthalpy of fusion
phosphates form insoluble compounds with group II ions. in a chemical reaction
between ammonium and phosphate and calcium chloride:
calcium phosphate will precipitate
a molecule that, to a small extent, dissociates in water to produce H⁺ ions is called
a weak acid
which gas law relates the pressure to the volume of an ideal gas?

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