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