a theory is accepted as the explanation of an observed phenomenon until...

repeated observations conflict with the theory

the rays produced in a cathode ray tube are...

deflected away from a negative plate

the radius of an atom extends to the outer edge of the...

region occupied by the electrons

an atom is electrically neutral because...

the # of protons and electrons are equal

standards of measurement are chosen because they...

are reproducible in another labratory

the equation density=mass/volume, mass divided my volume has a constant value. this means the..

equations graphs as a straight line

in rutherford's experiments, alpha particles...

were used to bombard thin metal foil

when adding #s, the sum should be rounded so that the final digit is in the same place as...

leftmost digit of the numbers added

the volumes of gas A and gas B are equal

the density of an object is calculated by...

dividing its mass by its volume

because most particles fired at metal foil passed straight through, rutherford concluded that..

atoms were most likely empty space

the atomic number of oxygen, 8, indicates that there are eight...

protons in the nucleus of an oxygen atom

which of the following is not part of dalton's atomic theory?

the # of protons in an atom is its atomic number

2 gases have the same temp but different pressures, kinetic-molecular theory does not predict..

both gases have the same densities

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2017 1st Semester Final Questions for Mr. Maryan Chemistry

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Questions 94

Answers

1
which of the following does not describe a direct proportionality between x and y?
xy=k
x=ky
y/x=k
x/y=k
2
the nucleus of deuterium contains one proton and...
two electrons
no neutrons
two neutrons
one neutron
3
what is the process when molecules of a gas pass through a small opening in a container?
distillation
vaporization
diffusion
effusion
4
all known chemical elements are organized into groups based on similar chemical properties in
element table
none of the above
chemical chart
periodic chart
5
refer to the picture
show uncertainty
show that the zero on the left of the decimal is not sig
show the decimal place of the first digit
are significant
6
refer to the picture
their rates of vaporization
their volumes
their compressibilities
the square roots of their molar masses
7
a mixture is...
a blend of 2+ kinds of matter, maintains unique properties
any group of elements that are chemically bonded to another
any substance with a uniform composition
a combination of pure substances bonded chemically
8
refer to the picture
17.1 cm2
17.17 cm2
17.169 cm2
17.2 cm2
9
refer to the picture
dalton
avogadro
graham
boyle
10
a theory is accepted as the explanation of an observed phenomenon until...
repeated observations conflict with the theory
a new method is discovered
a leading scientist declares that it is invalid
one study contradicts the theory
11
the rays produced in a cathode ray tube are...
striking a cathode
unaffected by a magnetic field
found to carry a positive charge
deflected away from a negative plate
12
the radius of an atom extends to the outer edge of the...
nucleus
region occupied by the neutrons
region occupied by the electrons
positive charges
13
the result of dividing 10⁷by 10^-3is...
102.5
104
1010
10-4
14
an atom is electrically neutral because...
the # of protons and electrons are equal
nuclear forces stabilize the charges
the # of protons and neutrons are equal
neutrons balance the protons and electrons
15
standards of measurement are chosen because they...
can be related to everyday objects
are reproducible in another labratory
cannot be destroyed by any common physical or chemical means
are easily changed
16
a nuclear particle that has about the same mass as a proton but with no electrical charge is a
neutron
isotope
nuclide
electron
17
the only pure substance listed below is...
seawater
bread dough
vitamin C (ascorbic acid)
vinegar (5% acetic acid)
18
refer to the picture
synthetics
products
reactants
equilibria
19
the vertical columns on the periodic table are called...
groups
periods
elements
rows
20
the equation density=mass/volume, mass divided my volume has a constant value. this means the..
product of mass and volume is a constant
equation graphs as a hyperbola
equations graphs as a straight line
variables mass and volume are inversely proportional
21
in rutherford's experiments, alpha particles...
were used to bombard thin metal foil
were used to bombard a cathode plate
passed through a tube containing gas
collided with electrons
22
what is the value of the gas constant?
0.281 L*atm
0.0821 mol*K
0.0821 ((L*atm)/(mol*K))
0.0281 ((L*atm)/(mol*K))
23
how many significant figures would the answer to the following calculation have?
4
2
5
3
24
which of the following is an intensive property of matter?
mass
amount of energy
volume
density
25
organic chemistry is the study of...
the chemistry of living things
crystals and minerals
properties, changes, & relationships between energy & matter
carbon-containing compounds
26
the number of grams equal to 0.5 kg is...
0.0005
5000
0.005
500
27
applied research is carried out in order to...
to learn basic information
to solve a particular problem
by accident
in order to make money
28
which of the following is an example of a homogeneous mixture?
marble
air
raw milk
orange juice
29
the relationship between the mass m of a material, its volume V, and its density D is...
D=m+v
D=V/m
D=m/V
D=mV
30
when adding #s, the sum should be rounded so that the final digit is in the same place as...
leftmost digit of the numbers added
last digit in the longest number added
rightmost digit of the numbers added
leftmost digit of the shortest number added
31
when 6.02 x 10²³is multiplied by 9.1 x 10^-31, the product is...
4.3 x 10-7
4.3 x 1054
4.3 x 10-8
4.3 x 10-53
32
the SI base unit for length is the...
millimeter
meter
kilometer
centimeter
33
which instrument measures atmospheric pressure?
manometer
torrometer
barometer
vacuum pump
34
metalloids are often...
unreactive
from outer space
semiconductors
lanthanides
35
which of these is not an SI base unit?
kilogram
liter
kelvin
second
36
how many significant digits should be shown in the product of 1.6 cm and 2.4 cm?
1
3
4
2
37
the horizontal rows on the periodic table are called...
elements
actinides
families
periods
38
refer to the picture
the volumes of gas A and gas B are equal
their volumes are proportional to their molar mass
the volume of gas B is greater than gas A
the volume of gas A is greater than gas B
39
0.25 g is equivalent to...
250 mg
250 kg
0.025 kg
0.025 mg
40
the density of an object is calculated by...
multiplying its mass times its volume
dividing its mass by its volume
adding its mass to its volume
dividing its volume by its mass
41
a state of matter that has no definite shape but has a definite volume is the _____ state
gas
plasma
solid
liquid
42
plasma is the fourth state of matter. in the plasma state...
atomic nuclei break down
atoms form molecules
atoms gain electrons
atoms lose electrons
43
because most particles fired at metal foil passed straight through, rutherford concluded that..
atoms were most likely empty space
atoms were indivisible
atoms contained no charged particles
electrons formed the nucleus
44
the atomic number of oxygen, 8, indicates that there are eight...
neutrons outside the oxygen atom's nucleus
energy levels in the oxygen atom's nucleus
oxygen nuclides
protons in the nucleus of an oxygen atom
45
which pair of quantities determines the density of a material?
volume & concentration
volume & weight
volume & mass
mass & weight
46
which of the following is not part of dalton's atomic theory?
the # of protons in an atom is its atomic number
all matter is composed of super small particles called atoms
in chem reactions, atoms are combined, seperated or combined
atoms cannot be divided, created, or destroyed
47
standard pressure is exactly...
101.325 atm
1 atm
101 atm
760 atm
48
because any element used in the cathode produced electrons, scientists concluded that...
atoms were invisible
only metals contained electrons
all atoms contained electrons
atoms carried a negative charge
49
all of the following equations are statements of the ideal gas law except...
p=nRTV
(PV/T)=nR
(P/n)=(RT/V)
R=(PV/nT)
50
2 gases have the same temp but different pressures, kinetic-molecular theory does not predict..
all collisions of the molecules are elastic
molecules in the low-pressure gas travel father b4 colliding
both gases have the same densities
molecules in both gases have the same average kinetic energy
51
how would 0.00930 m be expressed in scientific notation?
9.30 x 10-5 m
9.30 x 10-3 m
93 x 10-4 m
9.3 x 10-4 m
52
the ideal gas law is equivalent to avogadro's law when...
the volume is 22.4 L
the volume and pressure are constant
the pressure and temperature are constant
1 mol of gas is present
53
the metric unit for length that is closest to the diameter of a pencil is the...
millimeter
centimeter
decimeter
micrometer
54
refer to the picture
definite composition
multiple proportions
conversion of mass
mass action
55
refer to the picture
element
plasma
compound
mixture
56
a solid substance is...
always a crystal regardless of its container
always losing particles regardless of its container
always the same shape regardless of its container
always frozen regardless of its container
57
refer to the picture
rate of diffusion
volume
chemical properties
kinetic energy
58
refer to the picture
dalton's atomic theory
the law of conservation of mass
the law of multiple proportions
the law of conservation of energy
59
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
60
it is easy to determine whether a substance is a metal if the substance is...
a good electrical and heat conductor
very hard
very brittle
easy to break down into its components
61
the two most important properties of all matter are...
ability to carry electric current & to hold electric charge
being brittle and hard
being malleable and ductile
taking up space and having mass
62
which of these statements about density is true?
larger objects are more dense
density is a physical property
the density of an object depends on the force of gravity
density does not depend on temperature
63
according to dalton's atomic theory, atoms...
can be divided
of different elements cannot combine
of each element are identical in size mass &other properties
are destroyed in chemical reactions
64
refer to the picture
on approximately 5 minutes
closer to the end that held the heavier gas
exactly in the middle
closer to the end that held the lighter gas
65
the ideal gas law is equivalent to charle's law when...
the volume equals 22.4 L
R equals zero
the # of moles and the pressure are constant
the # of moles and the temperature are constant
66
what is the ratio of oxygen to carbon when 32 g of oxygen combine with 12 g of carbon?
1:1
1:2
8:3
2:1
67
when density is measured...
the temperature should be specified
the material must be a pure substance
the units are always kg/m3
a graduated cylinder is always used
68
which is an example of effusion?
air slowly escaping from a pinhole in a tire
the aroma of a cooling pie spreadin across a room
helium dispersing into a room after a ballon pops
oxygen and gasoline fumes mixing in an automobile carburetor
69
a homogeneous mixture is also called...
chemically bonded
a compound
a solute
a solution
70
refer to the picture
kinetic energy
quantity
elasticity
density
71
standard pressure is the pressure exerted by a column of mercury exactly...
760 cm high
273 mm high
760 mm high
1.00 m high
72
if a mixture is not uniform throughout, it is called...
heterogeneous
chemically bonded
homogeneous
a solution
73
an atom is...
smaller than an electron
smallest unit of matter that maintains its chemical identity
always made of carbon
the smallest unit of a compound
74
the most common form of hydrogen has...
three neutrons
one neutron
two neutrons
no neutrons
75
refer to the picture
had no mass
carried a positive charge
had a very large mass
had a very small mass
76
refer to the picture
equal to
either greater than or less than
greater than
less than
77
refer to the picture
an equal number of atoms
20 times as many atoms
twice as many atoms
half as many atoms
78
all atoms of the same element have the same...
atomic number
atomic mass
mass number
number of neutrons
79
relative atomic mass of an atom can be found by comparing the mass of the atom to the mass of..
a proton
one atom of hydrogen-1
one atom of carbon-12
uranium-235
80
a compound is...
any substance, whether it is chemically bonded or not
smallest unit of matter that maintains its chemical identity
made of 2+ atoms chemically bonded, can be broken down
a pure substance that cannot be broken down into substances
81
refer to the picture
the particles of the beam were negatively charged
atoms were invisible
there was gas in the tube
a magnetic field was produced
82
matter includes all of the following except...
light
water vapor
air
smoke
83
which of these is the abbreviation for the SI base unit of time?
hr
h
sec
s
84
which of the following is an extensive property of matter?
volume
density
boiling point
melting point
85
the ideal gas law combines boyle's law, charle's law, gay-lussac's law and...
dalton's principle
avogadro's law
raoult's law
graham's law
86
two variables are directly proportional if their ____ has a constant value.
difference
product
quotient
sum
87
noble gases are in group 18, and are best known because they are...
rare
unreactive
lanthanides
excellent conductors
88
molar mass...
both a and b
is the mass in grams of one mole of a substance
neither a nor b
is numerically equal to the average atomic mass of element
89
which part of the illustration shows the particles in a heterogeneous mixture?
c
d
a
b
90
what is the SI unit of force?
newton
pound
pascal
torr
91
the expression V=kn is a statement of...
avogadro's law
graham's law of effusion
boyle's law
the law of combining volumes
92
all isotopes of hydrogen contain...
one proton
one neutron
two nuclei
two electrons
93
why does the air pressure inside the tires of cars increase when the car is driven?
some of the air has leaked out
the atmosphere compresses the tire
air particles collide with the tire after the cars in motion
air particles inside tire increase speed bc the temp rises
94
the nucleus of an atom has all of the following characteristics except that it...
contains nearly all of the atom's mass
is very dense
contains nearly all of the atom's volume
is positively charged

2017 1st Semester Final Questions for Mr. Maryan Chemistry Flashcards | StudBud