stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Science 8 Final Exam Review Flashcards | StudBud
Explore
/
Science 8 Final Exam Review
Science 8 Final Exam Review
114 terms
·
StudBud Administration
·
1,338 plays
Final Exam review questions for 8th grade science
Flashcards
114 cards
F
Practice quiz
P
Host live
L
Questions
114
Answers
1
Represents the sum of the protons and neutrons in an atom…
ionic number
atomic number
electron number
mass number
2
Which of the following choices best represents force?
a push or a pull acting on an object
a push or a pull acting without an object
a push or a pull always causing motion
a push or a pull always causing acceleration
3
Compounds found in all living things include
ammonia
proteins
mercury oxides
carbonic acids
4
The most common element in Group 13, the Boron Group.
boron
oxygen
aluminum
carbon
5
When air is pumped into a tire,
the air takes up less space.
the air particles slow down.
the force per unit area increases.
the number of pascals decreases.
6
The smallest particle into which an element can be divided & still be the same substance is
an electron
a neutron
a nucleus
an atom
7
process that separates mixtures based on their boiling points is known as:
suspension
distillation
solubility
centrifuge
8
An element that is shiny and conducts heat and electricity well, is a(n)
metal
nobel gas
halogen
nonmetal
9
The change of a liquid to a vapor throughout the liquid
freezing
boiling
evaporation
condensation
10
After an investigation, what should you do if your results do not support your hypothesis?
Buy new measurement tools.
Repeat your investigation, then change your hypothesis
Change the topic you are studying
Repeat investigation results support the original hypothesis
11
Which of the following is a good way to analyze data?
Try to find some way to make it support your hypothesis
Check it over, and then copy it.
Ignore it for a while to see if it makes more sense later
Organize the data, and do calculations if necessary
12
In which of the following activities is friction helpful?
engine parts wearing out
car tires moving car forward
holes developing in your socks
soil erosion
13
In which classification of matter are components chemically combined?
a colloid
a suspension
a compound
a solution
14
What type of scientific model could best be used to represent a molecule?
psychological
physical
biological
chemical
15
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 hands of a clock relative to the numbers on a clock
The distance a car traveled relative to the time of travel
the velocity change of a train relative to time
16
As the distance between two objects increases, the force of gravity between them
increases only slightly
increases greatly
does not change
decreases
17
When the net forces equal 0 N, they are which of the following?
a push
unbalanced
a pull
balanced
18
What is the name of the process of that causes substances to change into new substances?
flammability
reaction
physical change
chemical change
19
Before asking questions, what is a scientist likely to do?
make observations
make answers that work
make necessary arrangements
make reservations
20
Very reactive nonmetal
transition metals
lanthanide
actinide
halogen
21
The substance in which a solute dissolves is a
solvent
mixture
solute
colloid
22
The change of state from a solid directly to a gas is called
freezing
sublimation
melting
condensation
23
Which of these is opposed by kinetic friction?
a book sitting on a table
a box sliding on a floor
a child leaning on a building
a cat standing in the yard
24
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 displaces water greater than its volume.
The object settles to the bottom of the water.
The object sinks about halfway into the water.
25
Why are chemical properties harder to observe than physical properties?
Chemical prop. describe the ability to change identity
Chemical properties depend on the size of the sample.
Physical properties cannot be observed and measured.
Physical prop. describe the ability to change identity
26
Which of the following does NOT describe weight?
can be measured in newtons
changes as gravitational force changes
is constant everywhere in the universe
is a measure of gravitational force
27
Metals that are so reactive that in nature they are found only combined w/ other elements
alkaline-earth metals
transition metals
alkali metals
actinides
28
What kind of changes in substances are always physical changes?
changes that result in new substances being formed
changes that change the identity of the substances
changes of state from solid to liquid to gas and back
changes that change the density of the substances
29
Which of the following units would you use to express the volume of an irregular solid?
liters (L)
mililiters (mL)
newtons (N)
cubic centimeters (cm3)
30
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
31
What makes characteristic properties useful to scientists?
They are easy to observe and measure.
They can be either physical or chemical.
Sample size does not matter.
They can be used to identify matter.
32
Which of the following is a good safety rule to follow?
Take shortcuts if there is no danger.
Follow the instructions, but feel free to modify them.
Pay attention to safety information and safety symbols.
Read lab instructions, but change them if you want to.
33
Which of the following is a chemical property of matter?
solubility
reactivity
volume
density
34
Which of the following substances can only be separated into simpler parts by chemical means?
sodium
salt water
water
gold
35
What is a scientific model?
a representation of an object or system
an exact representation made of similar material
a representation of an object, but smaller
a familiar copy of an object
36
At higher temperatures
particles in an object have less energy.
particles in an object move faster.
gas particles bump into walls less often
a gas contracts
37
In a solid, the particles
vibrate in place
overcome the strong attraction between them.
move independently of one another
slide past one another
38
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
39
Which of the following statements is NOT true of atoms and molecules?
They are tiny particles
They never bump into each other
They are always in motion
They are found in all matter
40
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 a measure of the amount of matter in the object.
It would be the same on the moon as it is on Earth.
It is measured in kilograms (kg) or grams (g).
41
Atom w/ same # of protons as other atoms of the same element
but
a diff. # of neutrons is
an electron
an isotope
an ion
a strong force
42
The curve at a liquid’s surface is its
inertia
volume
meniscus
mass
43
Unreactive nonmetals that do not react with other elements under normal conditions.
alkali metals
lanthanides
noble gases
halogens
44
The ability to be made into thin sheets is called
malleability
density
solubility
electrical conductivity
45
What is a force that opposes motion between two surfaces that are in contact?
motion
velocity
friction
acceleration
46
What is the basic unit of length that a scientist is likely to use?
mile
inch
foot
meter
47
Which of the following explains the difference between speed and velocity?
Velocity has direction, and speed does not.
Velocity has motion, and speed does not.
Velocity involves time, and speed does not.
Velocity involves acceleration, and speed does not.
48
What is matter?
the "stuff" that matters
The ability to do work
the "stuff" that is light enough to float
the "stuff" that everything is made of
49
What is the best way to tell if a chemical change has taken place?
A mixture separates into layers.
The composition changes.
The matter changes color.
The change is reversible.
50
The change of state from a gas to a liquid
evaporation
melting
boiling
Condensation
51
The ability of a substance to dissolve is called
density
chemical change
malleability
solubility
52
Which are the two factors that determine the amount of friction?
the force and the weight exerted on the surfaces
the force and the roughness of the surfaces
hills and valleys and the roughness of the surfaces
the force and how much surfaces come in contact
53
The tendency of an object to resist a change in motion
mass
weight
volume
inertia
54
Which of the following are two factors that determine speed?
motion and time
distance and time
acceleration and time
velocity and time
55
What are the two main branches of physical science?
chemistry and physics
geology and chemistry
biology and physics
chemistry and biology
56
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 is floating on top is the densest liquid.
The liquid with the deep red color is the densest liquid.
The liquid that settles to the bottom is the densest liquid.
57
Water pressure
is unaffected by atmospheric pressure
decreases with depth.
is less than air pressure for the same volume
is about twice as much on a diver at 10 m as at the surface.
58
A suspension is:
amount of substance in a given vol. of a mixture or solution
particles throughout a liquid/gas and large enough to settle
ability of a substance to dissolve in another
tiny particles that are between solutions and suspensions
59
Where are electrons likely to be found?
the nucleus
paths or energy levels
electron clouds
mixed throughout the atom
60
The substance that dissolves in a solvent is a
mixture
solute
solvent
colloid
61
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 reading the knowledge of the known world
the process of gathering knowledge about the natural world
62
Which of the following will NOT break down compounds?
filtering
heat
electric current
a chemical change
63
Which of the following does NOT describe mass?
is a measure of gravitational force
is measured in kilograms
remains constant
is a measure of matter
64
The combination of two or more substances that are not chemically combined is a
solution
mixture
colloid
concentration
65
Periodic law states that
elements' properties change w/ the elements’ atomic numbers.
mercury is a liquid at room temperature.
elements are either gases, solids, or liquids.
some elements stay in a liquid state only for short periods.
66
What equation would you use to find the volume of a rectangular box?
volume = length + height
volume = length X width X height
volume = length X width
volume = length + width + height
67
Crystalline solids
may also be liquids
have particles that are not in a special arrangements.
have particles in repeating pattern of rows
include glass and rubber
68
Each vertical column on the periodic table is called a(n)
period
property
group
element
69
Which of the following statements about fluids is NOT true?
Some take the shape of their container
Liquids and gases are included
Particles move easily past each other
All can flow
70
The nitrogen, oxygen, and other gases surrounding Earth
exert pressure only at sea level.
are found mainly near the outer edge of the atmosphere.
exert pressure that works against atmospheric pressure.
are pulled toward Earth by gravity.
71
How would you describe the nucleus?
tiny, negatively charged
dense, positively charged
large, positively charged
dense, negatively charged
72
Balloons can be twisted into shapes because
volume is measured in two dimensions
particles of gas can be compressed.
the force exerted changes the number of particles
the volume of a gas is constant.
73
Air rushes into your lungs when you inhale because
it contains oxygen.
fluids flow from high pressure to areas of low pressure.
pressure inside the lungs is higher than outside the body
a muscle moves upward and decreases the space in your chest.
74
A change in the form of a substance that does not change its identity is
solubility
density
chemical change
physical change
75
Which of the following always causes change in speed, direction, or both?
balanced forces
either balanced or unbalanced forces
unbalanced forces
any combination of forces
76
When two or more elements join together chemically,
a substance that is the same as the elements is formed
a mixture is formed
the physical properties of a substance remain the same
a compound is formed
77
What are three common kinds of scientific models?
mathematical, chemical, physical
physical, mathematical, conceptual
biological, chemical, mathematical
physical, psychological, conceptual
78
The physical properties of compounds do NOT include
melting point
reaction to light
color
density
79
Term for a mixture made of tiny particles that between a suspension and a solution
solution
concentration
mixture
colloid
80
Which of the following is NOT the result of a chemical change?
ground flour
digested food
soured milk
rusted metal
81
Which of these is opposed by static friction?
a pencil rolling on a table
a worker pushing on a non-moving box
a chair sliding on a floor
a dog running in a yard
82
The change for state from liquid to a solid
boiling
freezing
evaporation
condensation
83
Which of the following determines the net force acting on an object?
a combination of all motions of an object in two directions
a combination of all forces acting on an object
a combination of all motions of an object
combination of forces acting on an object in two directions
84
What must a good hypothesis be?
opinionated
correct
testable
difficult
85
Dalton believed that
atoms of different elements are the same.
atoms of the same element are exactly alike.
atoms can be divided.
most substances are made of atoms
86
Represents the sum of protons in the nucleus of an atom…
electron cloud
atomic number
the nucleus
mass number
87
A gas
has a definite volume but no definite shape.
has a definite shape but no definite volume.
has particles that are always close together.
has fast-moving particles
88
A property of an element that does not depend on the amount of the element is called a(n)
finite property
electromagnetic property
unique property
characteristic property
89
A solution that contains a large amount of solute is best described as
insoluble
concentrated
weak
dilute
90
What are some tools used to collect and analyze scientific data?
meterstick, balance, thermometer, computer
calculator, computer, printer, scanner
thermometer, drill, computer, screwdriver
scissors, meterstick, calculator, paper clip
91
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
92
The elements to the right of the zigzag line on the periodic table are called
metals
nonmetals
metalloids
conductors
93
The force of gravity
is related to the mass of the objects.
is not related to the mass of the objects.
is only related to the mass of large objects.
is related to weight of the objects.
94
A subatomic particle that has a positive charge
ion
electron
neutron
proton
95
Which of the following best represents acceleration as presented on a graph?
speed change vs. time
velocity change vs. time
distance change vs. time
motion change vs. time
96
Most metals are
not malleable
solid at room temperature.
dull
bad conductors of electric current
97
What type of scientific model would best be used to describe the formation of galaxies?
physical
conceptual
psychological
chemical
98
Which would NOT be a way to reduce friction?
using sandpaper
using ball bearings
pouring sand on ice
lubricating with oil
99
Periodic
means
happening frequently
happening very rarely
happening three or four times a year
happening at regular intervals
100
A change in which energy is gained by a substance as it changes state
exothermic
endothermic
melting
vapor pressure
101
Boiling point, melting point, and density are some of an element’s
chemical properties
physical properties
pure properties
nonreactive properties
102
The larger an object’s mass, the
larger its inertia
smaller its inertia
larger its volume
smaller its volume
103
According to Charle's Law
decreasing temperature of gas causes the volume to increase.
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.
104
Which of the following statements describes elements?
All of the particles in the same element are different.
Elements have unique sets of properties.
elements can be broken down into simpler substances.
Elements cannot be joined together in chemical reactions.
105
Boyle’s law states that for a fixed amount of gas
@ const. temp, vol & temp are directly proportional
@ const. pressure, vol of gas is indirectly related to temp
volume & pressure are inversely proportional @ const. temp
@ const. pressure, vol. of gas is directly related to temp
106
Which of the following causes an object to start moving?
either balanced or unbalanced forces
balanced forces
unbalanced forces
any combination of forces
107
How do elements join to form compounds
randomly
in a specific mass ratio
in a ration of 1 to 8
as the scientist plans it
108
What is the ability of a substance to burn known as?
burnability
reactivity
physical change
flammability
109
Which of the following is the most important part of gathering knowledge in science?
memorizing material
looking up answers
asking questions
using the internet
110
Nonmetal that forms a wide variety of compounds, such as proteins, fats, and carbohydrates.
sodium
oxygen
aluminum
carbon
111
All matter has mass
but only the Earth’s gravity affects matter.
but only the Earth’s and sun’s gravity affects matter.
and all mass is affected by gravity.
but objects with small masses are unaffected by gravity.
112
What is energy?
fossil fuels
power from the sun
matter in motion
the ability to do work?
113
In science, what is a scientific theory?
an explanation for many hypotheses and observations
the best idea to explain a hypothesis
the first idea to explain an observation
an explanation for many questions and answers
114
What is the machine that separates mixtures by the densities of the compounds?
concentration
refrigerator
distillation
centrifuge
