Transcript SampleChemIHSem2ExamQue07

Question #1
The most reactive metallic element in
this list is
A) zinc
B) calcium
C) tin
D) copper.
Question #2
The element with the smallest atoms
is
A) magnesium
B) copper
C) tin
D) chlorine
Question #3
Nonmetallic elements, such as bromine
and iodine, are most soluble in
A) nonpolar solvents
B) distilled water
C) salt water
D) hydrochloric acid.
Question #5
Compounds with ionic bonds are
usually formed from
A) members of the same group
B) two metals
C) two non-metals
D) a metal and non-metal.
Question #6
A soft compound, such as paraffin wax,
with a low melting point which does not
dissolve in water and does not conduct
electricity has the following type of
bonding
A) elemental
B) nonpolar covalent
C) metallic
D) ionic.
Question #7
The only substances listed that will
conduct electricity are
A) solid ionic compounds
B) solid metals
C) solid nonpolar covalent compounds
D) melted nonpolar covalent compounds.
Question #8
The shape of the ammonia molecule
, NH3, is
A) bent(angular)
B) trigonal planar
C) tetrahedral
D) trigonal pyramidal.
Question #9
The shape of the water molecule is
A) bent (angular)
B) linear
C) tetrahedral
D) pyramidal.
Question #10
The molecule with a symmetrical
shape is
A) ZnCl2
B) PF3
C) BBr3
D) CO2
Question #11
The polar molecule that has a positively
charged end and a negatively charged end
(referred to as a dipole) is
A) N2
B) Cl2
C) CH4
D) H2O
Question #12
When a liquid, such as acetone,
evaporates while on a towel in
contact with a temperature probe, the
temperature will
A) increase
B) decrease
C) remain the same
D) become equal to 100ºC.
Question #13
The compound whose molecules
will be held together by attractive
forces called hydrogen bonding is
A) H2
B) HF
C) C6H14
D) MgO
Question #14
The liquid with the strongest attractive
forces between its molecules will
evaporate
A) the slowest
B) the fastest
C) at the same rate as all other liquids
D) until it freezes
Problem #15
As the volume of a gas in a syringe is
decreased from 20 cc to 5 cc, the
pressure the trapped gas exerts
A) increases
B) decreases
C) becomes equal to zero
D) remains unchanged.
Problem #16
At STP, one mole of butane gas
occupies 22.4 liters and has a
density of 2.59 grams/liter. The
mass of 1.0 mole of butane is
A) 0.11 g
B) 2.5 g
C) 8.96 g
D) 58 g
Problem #17
During an exothermic reaction, such as
when Mg metal reacts with HCl(aq), the
temperature of the surrounding water
environment
A) increases
B) decreases
C) remains the same
D) becomes equal to standard temperature.
Problem #18
When Na2O powder reacts with
H2O(aq), the product formed is
A) Na metal
B) O2 gas
C) NaH solid
D) NaOH solution.
Problem #19
If 8.25 g CaCl2 is dissolved in 100 mL
of water, but it can hold 27.0 g, it is
A) saturated
B) unsaturated
C) supersaturated
D) oversaturated
Problem #20
HBB(aq) + H2O(l) <==> H1+(aq) + BB1-(aq)
yellow
blue
One way to produce more HBB is to
A) add hydrogen ions
B) add more water
C) remove hydrogen ions
D) remove BB1-
Problem #21
If a crystal of CuSO4 is dropped into a
solution of this compound and it
dissolves, then the original solution was
A) saturated
B) unsaturated
C) supersaturated
D) spectacular.
Problem #22
Crystals of NaCl can be formed
from a saturated solution of the
table salt by
A) stirring the mixture
B) adding sugar
C) evaporating off the water
D) adding more water.
Problem #23
If 4.0 mL of NaOH is needed to neutralize
10.0 mL of 0.100 M HCl(aq), then the M
of the NaOH is
A) 0.25M
B) 0.10M
C) 0.50M
D) 0.40M
Problem #24
Hydrochloric acid is a very strong
acid, which means that when the HCl
is dissolved in water it
A) completely separates into ions
B) only slightly ionizes
C) forms excess hydroxide ions
D) raises the pH above 7.
Problem #25
Milk of Magnesia(MoM) contains an
excess amount of large particles of
solid magnesium hydroxide that
eventually settle out of the mixture.
Therefore the MoM is classified as
being a
A) solution
B) compound
C) suspension
D) pure substance.
Problem #27
When gaseous organic hydrocarbons,
such as methane, are tested with a
burning wooden splint, they will burn
to form carbon dioxide and
A) water vapor
B) hydrogen gas
C) oxygen gas
D) iodine vapor.
Problem #28
Iso-propyl alcohol, also called 2-propanol,
is an isomer of
A) acetone, also called propanone
B) ethanol
C) ethanoic acid, also called acetic acid
D) 1-propanol.
Problem #29
When a gaseous product is collected
in the lab and tested with a burning
wooden splint, it pops(explodes).
This indicates that the gas could be
A) carbon dioxide
B) water vapor
C) hydrogen
D) oxygen
Problem #30
When a solute is dissolved in water, the
property of the water that will increase is the
A) evaporation rate
B) boiling point
C) vapor pressure
D) freezing point
Problem #31
Question #33
If the [OH-(aq)] of a solution is 0.022 M,
then the pH of the solution is:
A) 2.2 x 10-2
B) 1.67
C) 12.3
D) 14.0
(C) pOH = -log [0.022 M OH-] = 1.67
pH = 14 - pOH =14 - 1.67 = 12.3
Problem #35
An original sample of a radioactive
element had a mass of 10.0 grams.
After 4 days, 2.5 grams of the element
remains unchanged. The half-life of
this element is
A) 1 day
B) 2 days
C) 4 days
D) 5 days.
Problem #36
Uranium-238 spontaneously releases
an alpha particle in a process called
natural decay to form
A) plutonium
B) radon
C) lead
D) thorium.
Problem #37
An original sample of a radioactive
element had a mass of 10.0 grams.
After 4 days, 2.5 grams of the element
remains unchanged. The half-life of
this element is
A) 1 day
B) 2 days
C) 4 days
D) 5 days.
Problem #38
If 16.3 mL of a sample of bromine gas
are collected at a pressure of 5.00 atm
and a temperature of -25.0oC, the
number of moles of this gas present
are
A) 0.00400
B) 0.0163
C) 0.0252
D) 0.0821
Problem #39
A 12 L vessel holds N2 at 2.8 atm and
O2. The total pressure is 5.1 atm.
The partial pressure exerted by the
O2 gas is
A) 12 atm
B) 2.8 atm
C) 5.1 atm
D) 8.2 atm