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Worksheets8th Grade Final
Total questions: 90
Worksheet time: 2hrs 32mins
Name
Class
Date
1.
Sugar is added to water and stirred unit it completely dissolves. Which of the following correctly describes something that has happened to the sugar?
a)
The mass of the sugar decreased.
b)
The sugar disappeared an no longer exists.
c)
The sugar is evenly distributed in the water.
d)
The crystal of sugar have entered the atmosphere.
2.
Which statement is true?
a)
Oil is the most dense substance.
b)
Corn syrup is less dense than water.
c)
Oil is less dense than water.
d)
Oil and corn syrup have the same density but different masses.
3.
What is the volume of the rock? The water level is displaced from 20 mL to 23 mL with the rock.
a)
3 mL
b)
23 mL
c)
20 mL
d)
43 mL
4.
Which property would best separate a mixture of sand and iron filings?
a)
density
b)
electrical conductivity
c)
melting point
d)
magnetism
5.
Two objects are placed in water. One sinks and the other floats. Which conclusion can be drawn from this data?
a)
one object is magnetic and the other is not
b)
one object is solid and the other is a liquid
c)
one object has a greater density than the other
d)
one object is much larger than the other
6.
What is the amount of space that matter fills?
a)
area
b)
space
c)
pressure
d)
volume
7.
What is a pure substance?
a)
Protons Neutrons and Electrons.
b)
Particles that collide.
c)
Substance that can be separated by physical means.
d)
Substance that cannot be separated by physical means.
8.
What is the atomic number of Carbon?
a)
6
b)
12.0107
c)
C
d)
Carbon
9.
Solubility is
a)
an items ability to dissolve
b)
an items ability to melt
c)
an items ability to freeze
d)
an items ability to boil
10.
What is the smallest unit of matter?
a)
Element
b)
Atom
c)
Molecule
d)
Compound
11.
Changing liquid to a gas is called
a)
evaporation
b)
condensation
c)
melting
d)
freezing
12.
What is a measure of the gravitational force on an object?
a)
Matter
b)
Mass
c)
Density
d)
Weight
13.
What is a combination of substances that are combined physically but no chemically.
a)
Atom
b)
Element
c)
Pure Substance
d)
Mixture
14.
Which is an example of a physical change?
a)
chopping wood
b)
baking bread
c)
striking a match
d)
exploding fireworks
15.
The amount of matter in an object is a measure of the object's ________________.
a)
volume
b)
density
c)
mass
d)
solubility
16.
What would be the best way to measure the volume of a small rock?
a)
L x W x H with a ruler
b)
Put on triple beam balance
c)
Mass ÷ Volume
d)
Displacement method using graduated cylinder
17.
What is the formula for calculating density?
a)
Mass ∗ Volume
b)
Volume ∗ Mass
c)
Mass ÷ Volume
d)
Volume ÷ Mass
18.
Which state of matter has a fixed shape and volume and it's molecules move very slowly?
a)
Liquid
b)
Gas
c)
Solid
d)
Plasma
19.
5 grams of salt was mixed with 50 mL of water to form a solution. In the solution, the water was which of the following?
a)
Solvent
b)
Saturate
c)
Solute
d)
Transparent
20.
A liquid is
a)
a substance that does not have a definite shape or volume
b)
a substance with a definite volume, but no definite shape
c)
a substance with a definite shape and volume
d)
a substance whose particles vibrate
21.
A gas is
a)
a substance that does not have a definite shape or volume
b)
a substance with a definite volume, but no definite shape
c)
a substance with a definite shape and volume
d)
a substance whose particles glide past one another
22.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
23.
Which of the following properties is a physical property?
a)
magnetism
b)
reactivity with oxygen
c)
flammability
d)
non-reactive
24.
Which is a chemical change?
a)
freezing fruit juice
b)
slicing a potato
c)
boiling water
d)
copper metal turning green
25.
During Photosynthesis energy is absorbed. What kind of reaction is it?
a)
Physical
b)
Exothermic
c)
Endothermic
d)
Photothermic
26.
Stored energy that results from the position or shape of an object is called...
a)
Thermal
b)
Potential
c)
Kinetic
d)
Gravitational
27.
Mechanical energy
a)
energy built up before being in motion
b)
energy released in a chemical reaction
c)
energy of motion
d)
sum of kinetic and potential energy
28.
The roller coaster cart has the most gravitational potential energy at position-
a)
W
b)
X
c)
Y
d)
Z
29.
Wind turbines and windmills convert what energy to another?
a)
Kinetic to electric
b)
Gravitational potential to electric
c)
Mechanical to potential
d)
Thermal to sound
30.
Food, batteries, and fuel such as gasoline are similar because they are sources of _________ energy.
a)
chemical energy
b)
kinetic energy
c)
mechanical energy
d)
heat energy
31.
A measure of the average kinetic energy of the individual particles in an object is called:
a)
thermal energy
b)
conduction
c)
convection
d)
temperature
32.
The ability to do work or cause change
a)
speed
b)
job
c)
transfer
d)
energy
33.
A material that conducts heat poorly is called a(n):
a)
insulator
b)
conductor
c)
metal
d)
radiator
34.
Which of the following materials conducts heat well?
a)
glass
b)
plastic
c)
metal
d)
wood
35.
The type of heat transfer that happens through direct contact of molecules or particles with each other is ___________________.
a)
Convection
b)
Conduction
c)
Radiation
d)
insulation.
36.
___________________ is the type of heat transfer that occurs in fluids, such as warm air rising and cold air sinking; creating wind.
a)
Convection
b)
Conduction
c)
Radiation
d)
insulation.
37.
heat energy traveling in waves through space is an example of _____
a)
convection
b)
density
c)
radiation
d)
conduction
38.
Biomass is composed of
a)
plants, animal waste, and garbage
b)
radioactive materials
c)
energy rays from the sun
d)
nonrenewable products from the Earth.
39.
Which energy source uses turbines that spin in open air?
a)
nuclear
b)
hydropower
c)
solar
d)
wind
40.
Which of the following is NOT a fossil fuel?
a)
coal
b)
oil
c)
wood
d)
natural gas
41.
Fossil fuels are classified as nonrenewable because they.......
a)
require expensive equipment
b)
take millions of years to replace
c)
can be found all over
d)
provide all the energy we use
42.
When one large nucleus is split into two smaller nuclei, the process is nuclear _____.
a)
Fusion
b)
Fission
c)
Tracing
d)
Decay
43.
The periodic table has __ periods.
a)
18
b)
8
c)
2
d)
7
44.
Group 18 elements are known as the _____ _____ and have full valence shells.
a)
royal gases.
b)
supreme solids.
c)
noble gases.
d)
legit liquids.
45.
What period and group is Silver (Ag)?
a)
Period 2, Group 1
b)
Period 3, Group 16
c)
Period 5, Group 11
d)
Period 2, 14
46.
How many electrons do atoms need to be stable?
a)
1
b)
2
c)
6
d)
8
47.
Elements which are shiny, conduct electricity and heat are called
a)
metal
b)
nonmetal
c)
metalloid
d)
nonexistent
48.
Metalloids can be described as...
a)
same as nonmetals
b)
bad conductors
c)
characteristics of metals and nonmetals
d)
same as metals
49.
Ions are:
a)
atoms with a positive or negative charge
b)
atoms with no charge
c)
atoms with ONLY a positive charge
d)
atoms with ONLY a negative charge
50.
When an atom loses a valence electron, it becomes a(n) _____________ ion.
a)
positive
b)
negative
c)
neutral
d)
polyatomic
51.
How many valence electrons does this atom have?
a)
2
b)
4
c)
6
d)
8
52.
Which subatomic particles are found in nucleus?
a)
Proton and electron
b)
Proton and neutron
c)
neutron and electron
d)
neutron, electron and proton
53.
Which of the following best describes the properties of metals?
a)
hard, brittle, and nonconductive
b)
liquid, dark, and conductive
c)
shiny, malleable, and conductive
d)
soft, oily, and very reactive
54.
What does the number of electrons in the outer level indicate about the element?
a)
how reactive the element is
b)
how malleable the element is
c)
how brittle the element is
d)
how ductile the element is
55.
A negatively charged particle that moves around the nucleus is a(n)
a)
proton
b)
neutron
c)
electron
d)
quark
56.
The modern periodic table is arranged by the
a)
atomic mass
b)
alphabetically
c)
element name
d)
atomic number
57.
How do covalent bonds form?
a)
Donating & receiving valence e- between atoms.
b)
Opposite slight charges attract each other between compounds.
c)
Scientists are still not sure how they form.
d)
Sharing valence e- between atoms.
58.
How many atoms in all are in a molecule of serotonin?
C10H12N2O
a)
22
b)
24
c)
25
d)
4
59.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter exists in the same state throughout any chemical change
d)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
60.
How many Al atoms are in this compound? 4Al2O3
a)
2
b)
8
c)
6
d)
4
61.
In an exothermic reaction, energy is _________.
a)
Released
b)
Absorbed
c)
Stored
d)
Doubled
62.
The 2 in the formula is a(n) __________ .
a)
subscript
b)
inhibitor
c)
product
d)
exothermic reaction
e)
synthesis reaction
63.
Enzymes in your body act as catalysts. Thus, the role of enzymes is.....
a)
to increase the rate of chemical reactions.
b)
to decrease the rate of chemical reactions.
c)
to help you breathe.
d)
to inhibit chemical reactions.
64.
Balance this equation: H2 + N2 → NH3
a)
H2 + 4N2 → NH3
b)
H2 + 3N2 → 2NH3
c)
3H2 + N2 → 2NH3
d)
2H2 + 2N2 → 2NH3
65.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
66.
The substances you put together in a chemical reaction and are on the left side of an equation are called
a)
products.
b)
reactants.
c)
elements.
d)
compounds.
67.
A pure substance composed of all the same type of atoms is called:
a)
compound
b)
element
c)
molecule
d)
atom
68.
The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?
a)
3
b)
9
c)
7
d)
5
69.
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
a)
strongly acidic
b)
slightly acidic
c)
strongly basic
d)
slightly basic
70.
Many cleaning solutions are bases. Which of the following is a property of most bases?
a)
feels slippery
b)
white color
c)
can only be liquid
d)
tastes sour
71.
Bleach is a strong base, what is the pH level of bleach?
a)
13
b)
14
c)
1
d)
2
72.
In a neutralization reaction, what are the products of a reaction between an acid and a base?
a)
Another acid and base
b)
Carbon dioxide and a salt
c)
Water and a salt
d)
Either two acids or two bases
73.
The pH of pure water is
a)
3
b)
2
c)
8
d)
7
74.
Which of the following word pairs correctly completes the sentence below?
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.
a)
Acids; pH less than 7
b)
Acids; pH greater than 7
c)
Bases; pH greater than 7
d)
Bases; pH less than 7
75.
This type of mixture contains two or more substances that are visibly distinguishable.
a)
homogeneous
b)
heterogeneous
c)
solution
d)
colloid
76.
A basketball with a mass of 0.60 kg is accelerated with a force of 10.8 N. If resisting forces are ignored, what is the acceleration of the basketball to the nearest m/s2?
a)
16 m/s2
b)
17 m/s2
c)
18 m/s2
d)
19 m/s2
77.
A bus travels 20 km in 30 minutes. What is the average speed of the bus?
a)
20 km/h
b)
30 km/h
c)
40 km/h
d)
50 km/h
78.
A person not wearing a seatbelt flies through a car window when someone slams on the breaks because the person’s body wants to remain in continuous motion even when the car stops.
a)
Newton's 1st Law
b)
Newton's 2nd Law
c)
Newton's 3rd Law
d)
None of them
79.
What is the net force on the block? (click on the words to view the picture)
a)
5 Newtons up
b)
5 Newtons down
c)
15 Newtons up
d)
15 Newtons down
80.
a push or a pull acting upon an object
a)
force
b)
motion
c)
energy
d)
friction
81.
When an object changes position relative to another object or "reference point."
a)
speed
b)
velocity
c)
acceleration
d)
motion
82.
What is the net force
a)
10 N
b)
0 N
c)
25 N
d)
1 N
83.
Which of the following objects has the least acceleration?
a)
a. an empty shopping cart pushed with a hard force
b)
b. a full shopping cart pushed with a hard force
c)
c. an empty shopping cart pushed with a light force
d)
d. a full shopping cart pushed with a light force
84.
The unit used to measure work is the
a)
Watt
b)
Newton
c)
Joule
d)
meter
85.
Power is defined as the quantity that measures the rate at which _____ is done or energy is transformed.
a)
energy
b)
time
c)
work
d)
elasticity
86.
If a group of workers can apply a force of 1,000 Newtons to move a crate 20 meters, what amount of work will they have accomplished?
a)
20,000 J
b)
200 J
c)
2,000 J
d)
20 J
87.
An inclined plane wrapped around a rod forms this simple machine
a)
lever
b)
pulley
c)
screw
d)
wedge
88.
A simple machine that consists a rigid bar that pivot about a fixed point
a)
lever
b)
pulley
c)
wheel and axle
d)
fulcrum
89.
A seesaw is an example of a
a)
wedge
b)
lever
c)
inclined plane
d)
pulley
90.
The device used to raise a flag up a flag pole is an example of a
a)
wheel and axle
b)
lever
c)
inclined plane
d)
pulley
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