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Science 8 Final Exam Review
Science 8 Final Exam Review
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Final Exam review questions for 8th grade science
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1
Unreactive nonmetals that do not react with other elements under normal conditions.
alkali metals
lanthanides
halogens
noble gases
2
Very reactive nonmetal
halogen
transition metals
actinide
lanthanide
3
Which are the two factors that determine the amount of friction?
the force and how much surfaces come in contact
hills and valleys and the roughness of the surfaces
the force and the weight exerted on the surfaces
the force and the roughness of the surfaces
4
In which classification of matter are components chemically combined?
a colloid
a compound
a suspension
a solution
5
The substance in which a solute dissolves is a
mixture
solvent
solute
colloid
6
Boiling point, melting point, and density are some of an element’s
physical properties
pure properties
chemical properties
nonreactive properties
7
Which of the following causes an object to start moving?
either balanced or unbalanced forces
any combination of forces
unbalanced forces
balanced forces
8
What are the two main branches of physical science?
geology and chemistry
chemistry and physics
biology and physics
chemistry and biology
9
Which of the following does NOT describe mass?
remains constant
is a measure of gravitational force
is a measure of matter
is measured in kilograms
10
Why is the International System of Units important?
It's easy to use and keeps data confidential with it.
It is based on the number 10 and is used by most scientists.
It's used by countries competing for scientific knowledge
It helps to promote good relations among countries
11
Which of the following is the best definition of science?
the process of gathering knowledge about the ancient world
the process of gathering knowledge about the natural world
the process of reading the knowledge of the known world
process of memorizing answers about the natural world
12
Which of the following are two factors that determine speed?
acceleration and time
distance and time
velocity and time
motion and time
13
If you poured three liquids into a beaker, how could you tell which one is the densest liquid?
There is no way to tell which liquid is densest
The liquid that settles to the bottom is the densest liquid.
The liquid with the deep red color is the densest liquid.
The liquid that is floating on top is the densest liquid.
14
Which of the following is a chemical property of matter?
volume
solubility
reactivity
density
15
Which of the following choices best represents force?
a push or a pull always causing acceleration
a push or a pull acting without an object
a push or a pull acting on an object
a push or a pull always causing motion
16
A suspension is:
tiny particles that are between solutions and suspensions
ability of a substance to dissolve in another
particles throughout a liquid/gas and large enough to settle
amount of substance in a given vol. of a mixture or solution
17
Why are chemical properties harder to observe than physical properties?
Physical prop. describe the ability to change identity
Chemical prop. describe the ability to change identity
Chemical properties depend on the size of the sample.
Physical properties cannot be observed and measured.
18
What equation would you use to find the volume of a rectangular box?
volume = length + height
volume = length X width
volume = length + width + height
volume = length X width X height
19
Which of the following substances can only be separated into simpler parts by chemical means?
salt water
sodium
gold
water
20
What must a good hypothesis be?
difficult
testable
opinionated
correct
21
Atom w/ same # of protons as other atoms of the same element
but
a diff. # of neutrons is
a strong force
an isotope
an ion
an electron
22
In a solid, the particles
overcome the strong attraction between them.
slide past one another
move independently of one another
vibrate in place
23
Metals that are so reactive that in nature they are found only combined w/ other elements
actinides
alkali metals
transition metals
alkaline-earth metals
24
What are three common kinds of scientific models?
physical, mathematical, conceptual
mathematical, chemical, physical
physical, psychological, conceptual
biological, chemical, mathematical
25
What type of scientific model could best be used to represent a molecule?
physical
chemical
biological
psychological
26
Which of the following statements about fluids is NOT true?
Some take the shape of their container
All can flow
Particles move easily past each other
Liquids and gases are included
27
Boyle’s law states that for a fixed amount of gas
volume & pressure are inversely proportional @ const. temp
@ const. pressure, vol of gas is indirectly related to temp
@ const. pressure, vol. of gas is directly related to temp
@ const. temp, vol & temp are directly proportional
28
A change in the form of a substance that does not change its identity is
chemical change
density
physical change
solubility
29
Balloons can be twisted into shapes because
the force exerted changes the number of particles
the volume of a gas is constant.
particles of gas can be compressed.
volume is measured in two dimensions
30
Dalton believed that
atoms of the same element are exactly alike.
atoms of different elements are the same.
atoms can be divided.
most substances are made of atoms
31
The physical properties of compounds do NOT include
melting point
density
reaction to light
color
32
The force of gravity
is related to weight of the objects.
is not related to the mass of the objects.
is only related to the mass of large objects.
is related to the mass of the objects.
33
Which of the following statements describes elements?
Elements have unique sets of properties.
elements can be broken down into simpler substances.
All of the particles in the same element are different.
Elements cannot be joined together in chemical reactions.
34
Which would NOT be a way to reduce friction?
lubricating with oil
pouring sand on ice
using sandpaper
using ball bearings
35
Air rushes into your lungs when you inhale because
a muscle moves upward and decreases the space in your chest.
it contains oxygen.
fluids flow from high pressure to areas of low pressure.
pressure inside the lungs is higher than outside the body
36
What are some tools used to collect and analyze scientific data?
calculator, computer, printer, scanner
scissors, meterstick, calculator, paper clip
thermometer, drill, computer, screwdriver
meterstick, balance, thermometer, computer
37
Which of the following does NOT describe weight?
changes as gravitational force changes
can be measured in newtons
is constant everywhere in the universe
is a measure of gravitational force
38
When two or more elements join together chemically,
a compound is formed
a mixture is formed
the physical properties of a substance remain the same
a substance that is the same as the elements is formed
39
The ability to be made into thin sheets is called
solubility
malleability
density
electrical conductivity
40
After an investigation, what should you do if your results do not support your hypothesis?
Change the topic you are studying
Buy new measurement tools.
Repeat investigation results support the original hypothesis
Repeat your investigation, then change your hypothesis
41
The elements to the right of the zigzag line on the periodic table are called
metalloids
metals
conductors
nonmetals
42
Which of the following explains the difference between speed and velocity?
Velocity has motion, and speed does not.
Velocity has direction, and speed does not.
Velocity involves time, and speed does not.
Velocity involves acceleration, and speed does not.
43
Most metals are
bad conductors of electric current
not malleable
solid at room temperature.
dull
44
The tendency of an object to resist a change in motion
volume
inertia
weight
mass
45
Term for a mixture made of tiny particles that between a suspension and a solution
solution
mixture
concentration
colloid
46
The combination of two or more substances that are not chemically combined is a
solution
colloid
mixture
concentration
47
Which of these is opposed by kinetic friction?
a box sliding on a floor
a cat standing in the yard
a child leaning on a building
a book sitting on a table
48
Compounds found in all living things include
carbonic acids
proteins
mercury oxides
ammonia
49
Which of the following statements is true about an object’s weight but NOT its mass?
It may vary depending on the object’s location.
It is measured in kilograms (kg) or grams (g).
It is a measure of the amount of matter in the object.
It would be the same on the moon as it is on Earth.
50
The change of state from a gas to a liquid
boiling
Condensation
evaporation
melting
51
What is the name of the process of that causes substances to change into new substances?
physical change
reaction
flammability
chemical change
52
A gas
has particles that are always close together.
has a definite shape but no definite volume.
has fast-moving particles
has a definite volume but no definite shape.
53
The curve at a liquid’s surface is its
mass
meniscus
inertia
volume
54
A solution that contains a large amount of solute is best described as
dilute
concentrated
insoluble
weak
55
Which of the following is the most important part of gathering knowledge in science?
looking up answers
using the internet
memorizing material
asking questions
56
When air is pumped into a tire,
the air particles slow down.
the number of pascals decreases.
the force per unit area increases.
the air takes up less space.
57
What makes characteristic properties useful to scientists?
They can be either physical or chemical.
Sample size does not matter.
They are easy to observe and measure.
They can be used to identify matter.
58
What is the basic unit of length that a scientist is likely to use?
mile
meter
inch
foot
59
An element that is shiny and conducts heat and electricity well, is a(n)
nonmetal
nobel gas
metal
halogen
60
What is matter?
the "stuff" that matters
The ability to do work
the "stuff" that everything is made of
the "stuff" that is light enough to float
61
In science, what is a scientific theory?
an explanation for many questions and answers
an explanation for many hypotheses and observations
the first idea to explain an observation
the best idea to explain a hypothesis
62
The change for state from liquid to a solid
freezing
evaporation
boiling
condensation
63
Which of the following determines the net force acting on an object?
combination of forces acting on an object in two directions
a combination of all motions of an object
a combination of all motions of an object in two directions
a combination of all forces acting on an object
64
The change of a liquid to a vapor throughout the liquid
evaporation
boiling
condensation
freezing
65
Nonmetal that forms a wide variety of compounds, such as proteins, fats, and carbohydrates.
sodium
aluminum
oxygen
carbon
66
According to Charle's Law
decreasing temp on gas causes pressure on molec.to decrease.
increasing temperature on gas causes pressure to increase.
increasing temperature on gas causes volume to increase.
decreasing temperature of gas causes the volume to increase.
67
A change in which energy is gained by a substance as it changes state
endothermic
exothermic
vapor pressure
melting
68
Periodic
means
happening at regular intervals
happening three or four times a year
happening very rarely
happening frequently
69
The ability of a substance to dissolve is called
solubility
malleability
density
chemical change
70
Periodic law states that
elements are either gases, solids, or liquids.
mercury is a liquid at room temperature.
elements' properties change w/ the elements’ atomic numbers.
some elements stay in a liquid state only for short periods.
71
What is energy?
the ability to do work?
matter in motion
fossil fuels
power from the sun
72
process that separates mixtures based on their boiling points is known as:
centrifuge
suspension
distillation
solubility
73
In which of the following activities is friction helpful?
holes developing in your socks
car tires moving car forward
soil erosion
engine parts wearing out
74
What is a scientific model?
an exact representation made of similar material
a representation of an object or system
a familiar copy of an object
a representation of an object, but smaller
75
Which of the following most closely illustrates motion by relating it to a reference point?
the hands of a clock relative to the numbers on a clock
the velocity change of a train relative to time
the speed of a bicycle relative to the direction of travel
The distance a car traveled relative to the time of travel
76
Which of the following units would you use to express the volume of an irregular solid?
liters (L)
newtons (N)
mililiters (mL)
cubic centimeters (cm3)
77
What is the best way to tell if a chemical change has taken place?
The matter changes color.
A mixture separates into layers.
The change is reversible.
The composition changes.
78
Which of the following will NOT break down compounds?
heat
electric current
a chemical change
filtering
79
Represents the sum of the protons and neutrons in an atom…
ionic number
mass number
atomic number
electron number
80
What kind of changes in substances are always physical changes?
changes that result in new substances being formed
changes that change the density of the substances
changes of state from solid to liquid to gas and back
changes that change the identity of the substances
81
Which of the following is a good way to analyze data?
Check it over, and then copy it.
Organize the data, and do calculations if necessary
Ignore it for a while to see if it makes more sense later
Try to find some way to make it support your hypothesis
82
Which of the following best represents acceleration as presented on a graph?
motion change vs. time
velocity change vs. time
distance change vs. time
speed change vs. time
83
When the net forces equal 0 N, they are which of the following?
balanced
unbalanced
a push
a pull
84
Which of the following always causes change in speed, direction, or both?
any combination of forces
either balanced or unbalanced forces
unbalanced forces
balanced forces
85
The substance that dissolves in a solvent is a
mixture
solute
solvent
colloid
86
What type of scientific model would best be used to describe the formation of galaxies?
chemical
psychological
physical
conceptual
87
Which of the following statements is NOT true of atoms and molecules?
They are always in motion
They are found in all matter
They never bump into each other
They are tiny particles
88
The change of state from a solid directly to a gas is called
freezing
condensation
sublimation
melting
89
Which of these is opposed by static friction?
a pencil rolling on a table
a worker pushing on a non-moving box
a dog running in a yard
a chair sliding on a floor
90
Which of the following is NOT the result of a chemical change?
rusted metal
ground flour
digested food
soured milk
91
Represents the sum of protons in the nucleus of an atom…
mass number
atomic number
the nucleus
electron cloud
92
Each vertical column on the periodic table is called a(n)
element
group
period
property
93
Which of the following is NOT an example of a physical change?
the explosion of fireworks
the melting of a Popsicle
the sanding of a piece of wood
the shaping of a gold bar
94
What happens to an object with a density less than water when it is placed in water?
The object floats on top of the water.
The object sinks about halfway into the water.
The object settles to the bottom of the water.
The object displaces water greater than its volume.
95
Crystalline solids
may also be liquids
include glass and rubber
have particles in repeating pattern of rows
have particles that are not in a special arrangements.
96
How do elements join to form compounds
in a ration of 1 to 8
in a specific mass ratio
randomly
as the scientist plans it
97
All matter has mass
but objects with small masses are unaffected by gravity.
and all mass is affected by gravity.
but only the Earth’s gravity affects matter.
but only the Earth’s and sun’s gravity affects matter.
98
What are scientific methods?
steps scientists use to answer questions and solve problems
the steps scientists use to ensure a hypothesis is supported
the steps scientists use to look up the answers to questions
steps scientists use to answer questions and cause problems
99
Where are electrons likely to be found?
electron clouds
paths or energy levels
mixed throughout the atom
the nucleus
100
The nitrogen, oxygen, and other gases surrounding Earth
are pulled toward Earth by gravity.
exert pressure that works against atmospheric pressure.
exert pressure only at sea level.
are found mainly near the outer edge of the atmosphere.
101
What is the machine that separates mixtures by the densities of the compounds?
refrigerator
distillation
concentration
centrifuge
102
How would you describe the nucleus?
dense, positively charged
tiny, negatively charged
large, positively charged
dense, negatively charged
103
A property of an element that does not depend on the amount of the element is called a(n)
finite property
electromagnetic property
characteristic property
unique property
104
What is a force that opposes motion between two surfaces that are in contact?
velocity
motion
friction
acceleration
105
At higher temperatures
a gas contracts
gas particles bump into walls less often
particles in an object have less energy.
particles in an object move faster.
106
As the distance between two objects increases, the force of gravity between them
increases greatly
increases only slightly
does not change
decreases
107
What is the ability of a substance to burn known as?
physical change
flammability
burnability
reactivity
108
The most common element in Group 13, the Boron Group.
carbon
oxygen
aluminum
boron
109
Water pressure
decreases with depth.
is less than air pressure for the same volume
is unaffected by atmospheric pressure
is about twice as much on a diver at 10 m as at the surface.
110
Before asking questions, what is a scientist likely to do?
make necessary arrangements
make reservations
make answers that work
make observations
111
The smallest particle into which an element can be divided & still be the same substance is
a neutron
an electron
a nucleus
an atom
112
Which of the following is a good safety rule to follow?
Take shortcuts if there is no danger.
Read lab instructions, but change them if you want to.
Pay attention to safety information and safety symbols.
Follow the instructions, but feel free to modify them.
113
A subatomic particle that has a positive charge
neutron
ion
electron
proton
114
The larger an object’s mass, the
smaller its volume
larger its volume
larger its inertia
smaller its inertia
