which of the following statements NOT true

neutrons have a negative charge

During a state change

substance identity remains the same

What happens to the particles of a substance when it condenses

particles slow down & clump together

depends on the dependent variable

Which statement about an atom's nucleus is correct

nucleus is made of P & N and has a + charge

Democritus's original theory was revised because

did not have a scientific basis

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ILS semester exam 2019

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Questions 100

Answers

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

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