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2017 1st Semester Final Questions for Mr. Maryan Chemistry Flashcards | StudBud
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2017 1st Semester Final Questions for Mr. Maryan Chemistry
2017 1st Semester Final Questions for Mr. Maryan Chemistry
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1
which of the following is an example of a homogeneous mixture?
orange juice
air
marble
raw milk
2
which of these statements about density is true?
the density of an object depends on the force of gravity
density is a physical property
density does not depend on temperature
larger objects are more dense
3
refer to the picture
the volume of gas A is greater than gas B
their volumes are proportional to their molar mass
the volumes of gas A and gas B are equal
the volume of gas B is greater than gas A
4
which pair of quantities determines the density of a material?
volume & concentration
volume & weight
volume & mass
mass & weight
5
it is easy to determine whether a substance is a metal if the substance is...
very hard
a good electrical and heat conductor
easy to break down into its components
very brittle
6
the ideal gas law combines boyle's law, charle's law, gay-lussac's law and...
avogadro's law
raoult's law
dalton's principle
graham's law
7
which of these is the abbreviation for the SI base unit of time?
h
s
hr
sec
8
the nucleus of deuterium contains one proton and...
two neutrons
one neutron
two electrons
no neutrons
9
what is the SI unit of force?
pound
pascal
newton
torr
10
what is the value of the gas constant?
0.0821 ((L*atm)/(mol*K))
0.281 L*atm
0.0281 ((L*atm)/(mol*K))
0.0821 mol*K
11
refer to the picture
closer to the end that held the heavier gas
exactly in the middle
closer to the end that held the lighter gas
on approximately 5 minutes
12
the atomic number of oxygen, 8, indicates that there are eight...
oxygen nuclides
energy levels in the oxygen atom's nucleus
protons in the nucleus of an oxygen atom
neutrons outside the oxygen atom's nucleus
13
all atoms of the same element have the same...
mass number
number of neutrons
atomic number
atomic mass
14
refer to the picture
carried a positive charge
had no mass
had a very large mass
had a very small mass
15
the result of dividing 10
7
by 10
-3
is...
1010
102.5
104
10-4
16
the relationship between the mass
m
of a material, its volume
V
, and its density
D
is...
D=mV
D=m/V
D=m+v
D=V/m
17
an atom is electrically neutral because...
the # of protons and electrons are equal
the # of protons and neutrons are equal
nuclear forces stabilize the charges
neutrons balance the protons and electrons
18
refer to the picture
density
elasticity
kinetic energy
quantity
19
a nuclear particle that has about the same mass as a proton but with no electrical charge is a
nuclide
electron
isotope
neutron
20
which of the following is not part of dalton's atomic theory?
the # of protons in an atom is its atomic number
atoms cannot be divided, created, or destroyed
in chem reactions, atoms are combined, seperated or combined
all matter is composed of super small particles called atoms
21
two variables are directly proportional if their ____ has a constant value.
product
quotient
difference
sum
22
refer to the picture
show uncertainty
are significant
show the decimal place of the first digit
show that the zero on the left of the decimal is not sig
23
refer to the picture
their volumes
their compressibilities
the square roots of their molar masses
their rates of vaporization
24
organic chemistry is the study of...
crystals and minerals
properties, changes, & relationships between energy & matter
the chemistry of living things
carbon-containing compounds
25
the SI base unit for length is the...
millimeter
centimeter
kilometer
meter
26
the metric unit for length that is closest to the diameter of a pencil is the...
centimeter
micrometer
decimeter
millimeter
27
refer to the picture
half as many atoms
20 times as many atoms
twice as many atoms
an equal number of atoms
28
metalloids are often...
lanthanides
unreactive
from outer space
semiconductors
29
a compound is...
a pure substance that cannot be broken down into substances
made of 2+ atoms chemically bonded, can be broken down
smallest unit of matter that maintains its chemical identity
any substance, whether it is chemically bonded or not
30
a solid substance is...
always losing particles regardless of its container
always a crystal regardless of its container
always the same shape regardless of its container
always frozen regardless of its container
31
how many significant figures would the answer to the following calculation have?
2
5
3
4
32
the vertical columns on the periodic table are called...
groups
elements
rows
periods
33
the rays produced in a cathode ray tube are...
deflected away from a negative plate
found to carry a positive charge
unaffected by a magnetic field
striking a cathode
34
when 6.02 x 10
23
is multiplied by 9.1 x 10
-31
, the product is...
4.3 x 1054
4.3 x 10-53
4.3 x 10-7
4.3 x 10-8
35
a mixture is...
any substance with a uniform composition
a blend of 2+ kinds of matter, maintains unique properties
a combination of pure substances bonded chemically
any group of elements that are chemically bonded to another
36
refer to the picture
the law of conservation of mass
dalton's atomic theory
the law of conservation of energy
the law of multiple proportions
37
the radius of an atom extends to the outer edge of the...
region occupied by the neutrons
nucleus
positive charges
region occupied by the electrons
38
which of these is
not
an SI base unit?
kilogram
liter
second
kelvin
39
standard pressure is the pressure exerted by a column of mercury exactly...
760 cm high
760 mm high
1.00 m high
273 mm high
40
refer to the picture
dalton
avogadro
boyle
graham
41
refer to the picture
conversion of mass
definite composition
multiple proportions
mass action
42
standard pressure is exactly...
101 atm
1 atm
101.325 atm
760 atm
43
molar mass...
neither a nor b
both a and b
is the mass in grams of one mole of a substance
is numerically equal to the average atomic mass of element
44
which part of the illustration shows the particles in a heterogeneous mixture?
b
a
c
d
45
which of the following is an intensive property of matter?
density
mass
amount of energy
volume
46
the two most important properties of all matter are...
ability to carry electric current & to hold electric charge
being malleable and ductile
being brittle and hard
taking up space and having mass
47
all isotopes of hydrogen contain...
one neutron
two electrons
two nuclei
one proton
48
in rutherford's experiments, alpha particles...
collided with electrons
were used to bombard thin metal foil
were used to bombard a cathode plate
passed through a tube containing gas
49
the horizontal rows on the periodic table are called...
actinides
elements
periods
families
50
if a mixture is not uniform throughout, it is called...
a solution
chemically bonded
homogeneous
heterogeneous
51
refer to the picture
17.1 cm2
17.169 cm2
17.17 cm2
17.2 cm2
52
the equation
density=mass/volume,
mass divided my volume has a constant value. this means the..
equations graphs as a straight line
product of mass and volume is a constant
equation graphs as a hyperbola
variables mass and volume are inversely proportional
53
because any element used in the cathode produced electrons, scientists concluded that...
all atoms contained electrons
atoms carried a negative charge
only metals contained electrons
atoms were invisible
54
the number of grams equal to 0.5 kg is...
500
0.0005
0.005
5000
55
what is the ratio of oxygen to carbon when 32 g of oxygen combine with 12 g of carbon?
1:1
2:1
8:3
1:2
56
0.25 g is equivalent to...
0.025 mg
0.025 kg
250 kg
250 mg
57
how many significant digits should be shown in the product of 1.6 cm and 2.4 cm?
3
4
1
2
58
refer to the picture
compound
plasma
element
mixture
59
what is the process when molecules of a gas pass through a small opening in a container?
effusion
distillation
diffusion
vaporization
60
why does the air pressure inside the tires of cars increase when the car is driven?
air particles inside tire increase speed bc the temp rises
the atmosphere compresses the tire
some of the air has leaked out
air particles collide with the tire after the cars in motion
61
standards of measurement are chosen because they...
are reproducible in another labratory
cannot be destroyed by any common physical or chemical means
are easily changed
can be related to everyday objects
62
refer to the picture
greater than
either greater than or less than
less than
equal to
63
how would 0.00930 m be expressed in scientific notation?
93 x 10-4 m
9.30 x 10-5 m
9.30 x 10-3 m
9.3 x 10-4 m
64
noble gases are in group 18, and are best known because they are...
lanthanides
unreactive
rare
excellent conductors
65
when density is measured...
the temperature should be specified
a graduated cylinder is always used
the material must be a pure substance
the units are always kg/m3
66
a theory is accepted as the explanation of an observed phenomenon until...
a leading scientist declares that it is invalid
a new method is discovered
one study contradicts the theory
repeated observations conflict with the theory
67
the most common form of hydrogen has...
no neutrons
two neutrons
three neutrons
one neutron
68
the mass of 1 mole of chromium (atomic mass 51.996 amu) is...
12 g
198 g
6.02 x 1023 g
51.996 g
69
the only pure substance listed below is...
vitamin C (ascorbic acid)
vinegar (5% acetic acid)
bread dough
seawater
70
the ideal gas law is equivalent to charle's law when...
the # of moles and the temperature are constant
R equals zero
the # of moles and the pressure are constant
the volume equals 22.4 L
71
because most particles fired at metal foil passed straight through, rutherford concluded that..
electrons formed the nucleus
atoms were most likely empty space
atoms contained no charged particles
atoms were indivisible
72
a state of matter that has no definite shape but has a definite volume is the _____ state
gas
liquid
solid
plasma
73
applied research is carried out in order to...
by accident
to learn basic information
to solve a particular problem
in order to make money
74
an atom is...
the smallest unit of a compound
always made of carbon
smallest unit of matter that maintains its chemical identity
smaller than an electron
75
a homogeneous mixture is also called...
chemically bonded
a solution
a compound
a solute
76
refer to the picture
volume
chemical properties
rate of diffusion
kinetic energy
77
when adding #s, the sum should be rounded so that the final digit is in the same place as...
last digit in the longest number added
rightmost digit of the numbers added
leftmost digit of the numbers added
leftmost digit of the shortest number added
78
the ideal gas law is equivalent to avogadro's law when...
the volume and pressure are constant
1 mol of gas is present
the volume is 22.4 L
the pressure and temperature are constant
79
all known chemical elements are organized into groups based on similar chemical properties in
element table
periodic chart
chemical chart
none of the above
80
according to dalton's atomic theory, atoms...
can be divided
are destroyed in chemical reactions
of each element are identical in size mass &other properties
of different elements cannot combine
81
matter includes all of the following
except
...
air
smoke
water vapor
light
82
plasma is the fourth state of matter. in the plasma state...
atoms gain electrons
atoms lose electrons
atoms form molecules
atomic nuclei break down
83
the density of an object is calculated by...
multiplying its mass times its volume
adding its mass to its volume
dividing its mass by its volume
dividing its volume by its mass
84
the nucleus of an atom has all of the following characteristics
except
that it...
is positively charged
contains nearly all of the atom's mass
is very dense
contains nearly all of the atom's volume
85
all of the following equations are statements of the ideal gas law except...
R=(PV/nT)
(P/n)=(RT/V)
(PV/T)=nR
p=nRTV
86
relative atomic mass of an atom can be found by comparing the mass of the atom to the mass of..
one atom of carbon-12
a proton
uranium-235
one atom of hydrogen-1
87
refer to the picture
equilibria
products
reactants
synthetics
88
which of the following does not describe a direct proportionality between x and y?
x=ky
y/x=k
x/y=k
xy=k
89
refer to the picture
there was gas in the tube
the particles of the beam were negatively charged
a magnetic field was produced
atoms were invisible
90
which is an example of effusion?
helium dispersing into a room after a ballon pops
the aroma of a cooling pie spreadin across a room
air slowly escaping from a pinhole in a tire
oxygen and gasoline fumes mixing in an automobile carburetor
91
2 gases have the same temp but different pressures, kinetic-molecular theory does
not
predict..
molecules in both gases have the same average kinetic energy
molecules in the low-pressure gas travel father b4 colliding
all collisions of the molecules are elastic
both gases have the same densities
92
the expression
V=kn
is a statement of...
avogadro's law
the law of combining volumes
boyle's law
graham's law of effusion
93
which of the following is an extensive property of matter?
melting point
boiling point
density
volume
94
which instrument measures atmospheric pressure?
torrometer
manometer
barometer
vacuum pump
