August 2005 Chemistry Regents #11-20
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11 Which type of bonding is found in all molecular
(1) covalent bonding (3) ionic bonding
(2) hydrogen bonding (4) metallic bonding
|1||molecular is covalent|
|12 An aqueous solution of sodium chloride is best
classified as a
(1) homogeneous compound
(2) homogeneous mixture
(3) heterogeneous compound
(4) heterogeneous mixture
|2||solution is homogeneous|
|13 What is the total number of electrons shared in a
double covalent bond between two atoms?
(1) 1 (3) 8
(2) 2 (4) 4
|4||2 electrons = 1 bond|
|14 Which formula represents a nonpolar molecule?
(1) H2S (3) CH4
(2) HCl (4) NH3
|3||draw them, nonpolar is symmetrical|
|15 What occurs when an atom loses an electron?
(1) The atomís radius decreases and the atom becomes a negative ion.
(2) The atomís radius decreases and the atom becomes a positive ion.
(3) The atomís radius increases and the atom becomes a negative ion.
(4) The atomís radius increases and the atom becomes a positive ion.
|2||lose electron become positive and decrease in size|
|16 Two samples of gold that have different temperatures
are placed in contact with one another.
Heat will flow spontaneously from a sample of
gold at 60įC to a sample of gold that has a
(1) 50įC (3) 70įC
(2) 60įC (4) 80įC
|1||heat flows from hot to cold|
|17 Under which conditions of temperature and
pressure would helium behave most like an ideal
(1) 50 K and 20 kPa (3) 750 K and 20 kPa
(2) 50 K and 600 kPa (4) 750 K and 600 kPa
|3||ideal gas=ideal vacation
high temp and low pressure
|18 A sample of oxygen gas is sealed in container X.
A sample of hydrogen gas is sealed in container Z.
Both samples have the same volume, temperature,
and pressure. Which statement is true?
(1) Container X contains more gas molecules than container Z.
(2) Container X contains fewer gas molecules than container Z.
(3) Containers X and Z both contain the same number of gas molecules.
(4) Containers X and Z both contain the same mass of gas.
|3||same volume under the same
conditions same number of molecules
|2||unsaturated=double or triple bonded
hydrocarbon= only hydrogen and carbon
|1||5 carbons pent-
double bond -ene
at the second carbon 2-
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