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