During a state change

substance identity remains the same

which of the following statements NOT true

neutrons have a negative charge

Democritus's original theory was revised because

did not have a scientific basis

Molar mass is defined as

mass in grams of 1 mol of a substance

How does density of an object that sinks into a fluid compare to its density of the fluid

object that sinks is more dense that the fluid

Which statement about an element's average atomic mass is correct

is a weighted average, so common isotopes have a greater effect

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ILS semester exam 2019

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Questions 100

Answers

1
which of the following is not a type of orbital
d
s
p
x
2
the smallest unit of an element that maintains the properties of that element is
atom
substance
molecule
compound
3
how many electrons does the ion Mg +2 have
24
12
14
10
4
scientific methods
all the answers
used to find and evaluate possible solutions
use critical thinking to solve scientific problems
are general descriptions of scientific thinking
5
During a state change
substances identity could change
none
substance identity remains the same
substance identity changes
6
which of the following statements NOT true
protons have a positive charge
a nucleus has a positive charge
neutrons have a negative charge
neutrons have no charge
7
how many neutrons does the isotope C-13 have
13
6
7
12
8
SI is considered a consistent system because
has 7 base units
it is used worldwide
uses derived units
dates back to 1795
9
A gas becomes liquid through a process called
condensation
melting
evaporation
freezing
10
particles are ionized
solid
gas
plasma
liquid
11
The science of what matter is made of and how it changes
engineering
kinetics
physics
chemistry
12
which unit is used to measure the mass of a computer
kilogram
kelvin
meter
mole
13
how can a chemical change be reversed
both chemical & physical change
chemical change
none of the above
physical change
14
Democritus's original theory was revised because
did not have a scientific basis
he claimed matter is made of atoms
he claimed atoms could be divided
he explained what electrons are
15
evaporation refers to the change of state from a
liquid to a solid
solid to liquid
liquid to gas
gas to liquid
16
Pascal's principle states that contained fluid exerts pressure
equally in all directions
only upwards
upwards and downwards
only downwards
17
According to the modern atomic theory it is impossible to determine an electron's
position
mass
color
charge
18
The number of energy levels filled in an atom is determined by
neutrons
protons
photons
electrons
19
critical thinking
based on facts
all the answers
uses logic
uses observations
20
how many sig figs are in 70,200
2
4
5
3
21
a loaf of bread weighs 1362 g, what is the weight in kg
1.362 kg
0.01362 kg
0.1362 kg
1362 kg
22
Molar mass is defined as
the amount of a substance necessary to have a + charge
mass in grams of 1 mol of a substance
number of particles in 1 mole of a substance
SI base unit that describes the amount of a substance
23
What is the mass number of an element that has 19 protons, 19 electrons, & 20 neutrons
20
58
19
39
24
A science class puts a balloon containing 1.75L of air at 102Kpa into a jar, and change the volume to 2.75
new pressure = 65 kpa
none of the above
new pressure = 64kpa
new pressure = 64.9 k pa
25
whose model determined that an atom's positive charge is concentrated in the atom's center
democritus
dalton
thomson
rutherford
26
Temperature in which a substance changes from a liquid to a solid
saturation
condensation
freezing
boiling
27
The different substances in a mixture
keep their properties
form new molecules
combine chemically
cannot be separated
28
particles are in constant motion and rarely stick together
solid
gas
liquid
plasma
29
What is the mass of 2.5 mol of Ca, which has a molar mass of 40g/mol
40.0 g
100.0 g
2.5 g
20.0 g
30
How does density of an object that sinks into a fluid compare to its density of the fluid
object that sinks is as dense as the fluid
object that sinks is less dense than the fluid
density of the object is not related to the density of the fluid
object that sinks is more dense that the fluid
31
Maria is 123 cm tall, what is her height in meters
12.3 m
0.123 m
1.23 m
0.0123 m
32
a physical property of gold is
reactivity
none of these answers
density
nonflammability
33
How many total atoms are in a single molecule of Fe2O3
2
6
3
5
34
What is the density of a sample that has a volume of 125 ml and a mass of 200 g
1.6 g/ml
75 g/ml
0.625 g/ml
16 g/ml
35
Which of these statements is NOT part of Dalton's atomic theory
atoms are made of electrons
atoms of an element are alike
atoms cannot be divided
atoms of different elements form compounds
36
which of the following is made of at least 2 different types of atoms
matter
compound
molecule
element
37
solids,liquids, and gases are 3 forms of matter that
take up space
are made of atoms
all these answers
have mass
38
particles can slide past one another
gas
solid
liquid
plasma
39
Boyle's law relates pressure of a gas to its
container
volume
temperature
molecular composition
40
dependent variable
y axis
x axis
41
Which of the following is not fluid
water
wood
air
carbon dioxide
42
the law of conservation of mass states that mass cannot
created or destroyed
burn
change form
heated or cooled
43
Which statement about an element's average atomic mass is correct
based on isotope's charge
is equal to 1/12 the mass of the most common isotope
is a weighted average, so common isotopes have a greater effect
determined by counting number of isotopes of an element
44
A chemical change occurs whenever
objects change shape
hot objects melt
substances are mixed
new substances form
45
convert 3.5 kg to dg
35,000
35
350,000
350
46
Thomson is responsible for discovering that an atom contains
electrons
a nucleus
molecules
anodes
47
which graph shows parts of a whole
pie
none
bar
line
48
A Sodium atom, which has 11 electrons has ___ electrons in its 3rd energy level
2
1
8
0
49
found in the outer energy level
ions
electrons
isotopes
valence electrons
50
which of the following is a physical change
evaporating
all the answers
bending
dissolving
51
a mole is an SI unit that describes
volume of a substance
electric charge of a substance
amount of a substance
mass of a substance
52
which of the graph shows comparison between items
pie
line
bar
none
53
The change of a substance from a solid directly to a gas is called
evaporation
sublimation
condensation
melting
54
Who determined that atoms could be divided?
Democritus
dalton
rutherford
thomson
55
Which statement about an atom's nucleus is correct
Nucleus is made of E and has a - charge
nucleus is made of P & N & has a - charge
Nucleus is made of E & N and has a + charge
nucleus is made of P & N and has a + charge
56
a chemical property of copper is
density
color
reactivity
melting point
57
ideas that explain observations and is supported
scientific law
scientific theory
58
An Iron atom has an atomic mass of 56, and an atomic number of 26 how many neutrons does it have
56
30
26
82
59
An atom's mass number equals the number of
P + N
N
P + E
P
60
accuracy is judged by
reputation
how close a value is to true value
precision of the tool
none
61
which of the following is equal to 5,800,000,000cm
5.8 X 10^8 cm
5.8 X 10^ 9 cm
58 X 10^7 cm
58 X 10^9 cm
62
unit or quantum of light
photon
excited state
color
valence electron
63
an electron jumps to a new energy level
electrons location is pinpointed
atoms becomes charged
atom gains or loses energy
atom becomes unstable
64
an element's atomic number is equal to its number of
valence electrons
neutrons
protons
protons and neutrons
65
convert 200 mg to micrograms
20,000
2.0 X 10 ^ -5
2.0 X 10^5
0.0002
66
which graph is best to show data over time
bar
none
line
pie
67
independent variable
depends on manipulated variable
manipulated variable
68
Valence electrons determine an atom's
mass
electric charge
period
ability to make a compound
69
Gay-Lussac's law relates the temperature of a gas to its
molecular composition
volume
pressure
container
70
Unreacted atoms have no electric charge because?
they have equal # of charged and noncharged particles
They have equal number of electrons and protons
they have equal number of neutrons and protons
they have neutrons in their nuclei
71
pressure is calculated by dividing force by
area
none of the above
volume
mass
72
particles are rigid
gas
plasma
solid
liquid
73
According to Rutherford's model, electrons behave like
waves on a vibrating string
light energy in a vacuum
planets orbiting the sun
planets rotating on their axes
74
2 different isotopes of an element have different
# of electtons
# of neutrons
atomic numbers
# of protons
75
which of the following is 0.0000043
4.3 X 10^-6
4.3 X 10^7
4.3 X 10^6
4.3 X 10-7
76
Oxygen's atomic number is 8, this means that Oxygen has
8 p in its nucleus
8 neutrons in its nucleus
a total of 8 P & N
a total of 8 N & 8 E
77
dependent variable
depends on the dependent variable
manipulated variable
78
Avogadro's number is useful for
none of the above
counting atoms
locating at atoms electrons
counting large objects
79
independent variable
found on y axis
found on x axis
80
Temperature is a measure of the average __ energy of the particles in the object
thermal
potential
chemical
kinetic
81
where electrons are likely to be found
ground state
orbital
nucleus
excited state
82
charles' law relates volume of a gas to its
container
temperature
composition
pressure
83
As the volume of a fixed amount of gas at constant temperature decreases, its pressure
need more info
stays the same
increases
decreases
84
Which of the following is not a pure substance
compound
element
mixture
molecule
85
buoyant force is the __ force exerted on an object immersed or floating on a liquid
upward
lateral
tensile
downward
86
how many sig figs are in 7.357
3
4
1
5
87
the chemical formula for water (H20) means
2 H & 2 O
2 H & 1 O
2H & zero O
1 H & 2 O
88
According to the kinetic theory of matter, which of the following is true
atoms are always in motion
all these options
higher temp = faster molecules move
more massive particles move slower than lighter particles
89
a precise measurement
contains 3 sig figs
close to true value
contains the correct number of sig figs
is exact as possible
90
A subatomic particle that has a negative charge is called?
molecule
element
compound
electron
91
what happens to an electron when it gains energy
none
photon
ground state
excited state
92
The resistance of a fluid to flow is referred to as
pressure
viscosity
shape
energy
93
What is the molar mass of an element with an average atomic mass of 9.012u?
12.01g
9.102 g
0.012 g
6.022 X 10 23g
94
matter is defined as
has mass and takes up space
anything that can be seen and touched
can be weighed
contains kinetic energy
95
when a substance changes from a liquid to a gas the temperature of the substance
increases
varies
decreases
stays the same
96
What happens to the particles of a substance when it condenses
particles speed up & spread out
particles slow down & clump together
particles stick together & stop moving
particles vibrate & lose energy
97
which unit is used to measure the height of a bookcase
meter
mole
kelvin
kg
98
descriptive statement or equation that predicts events
scientific theory
scientific law
99
Thomson made his discovery about the atom using
thermal energy
kinetic energy
cathode rays
x rays
100
which of the following causes a chemical change
melting
shattering
burning
moving

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