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8th Grade Final Exam Review

Total questions: 50

Worksheet time: 1hrs 29mins

Name
Class
Date
1.

man made materials and substances that do not exist naturally in the environment

a)

nonrenewable products

b)

synthetic products

c)

systematic products

d)

none of the above

2.
A common synthetic material that is found almost everywhere is ________.
a)
Coal
b)
Lumber
c)
Plastic
d)
Aerogel
3.

Grape Kool-Aid dissolves in water and makes purple water.

a)

Physical

b)

Chemical

4.

Hydrochloric acid reacts with potassium hydroxide to produce a salt, water and heat.

a)

Physical

b)

Chemical

5.

A piece of wood is sawed in two.

a)

Physical Change

b)

Chemical Change

6.

An iron shovel is rusting.

a)

Physical Change

b)

Chemical Change

7.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
8.
Example of a physical property
a)
magnetism
b)
reactivity with oxygen
c)
flammability
d)
non-reactive
9.
Example for physical property
a)
odor
b)
burns in air
c)
reacts with water to create hydrogen gas
d)
rust
10.
Example for physical property
a)
melting point
b)
flammability
c)
reactivity 
d)
combustion
11.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
rust
12.
What heat transfer happens when you burn your hand by touching a fire?
a)
Radiation
b)
Conduction
c)
Convection
d)
I don't know!!!!!!!!!!!
13.
Warm air is __________ dense than cold air and rises creating convection currents.
a)
more
b)
less
14.
What happens when ice cubes melt in a glass?
a)
Heat travels from the ice to the warmer water.
b)
No energy is transferred.
c)
Heat is transferred from the warmer water to the ice cubes.
d)
The water warms up due to the humidity
15.
oxygen is a gas produced by _ and used by  _ 
a)
plants and animals 
b)
photosynthesis and carbon dioxide 
c)
animals and plants 
d)
carbon dioxide and photosynthesis
16.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
17.
Which process converts carbon in the form of sugar into carbon dioxide gas?
a)
Bioremediation
b)
Photosynthesis
c)
Respiration
d)
Transpiration
18.
If the plant population decreased, the amount of carbon would _________.
a)
Stay the same
b)
Increase
c)
Decrease
19.
A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?
a)
The mass of the balloon increases because the size of the balloon has increased.
b)
The mass of the balloon increases because the temperature of the balloon has increased.
c)
The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.
20.
A 500-gram block of solid cheese is melted in a pot. Which is most likely the mass of the cheese after it is melted?
a)
500 grams, because the cheese does not gain or lose mass just because it was melted
b)
499 grams, because some of the cheese evaporates as it melts
c)
502 grams, because the cheese absorbs heat as it melts
21.
A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?
a)
50 
b)
55 
22.
The signal above is an example of a(n)
a)
Digital Signal
b)
Analog Signal
23.
Smooth and continuous data
a)
analog
b)
digital
c)
pulse
d)
binary
24.
Why are digital signals more reliable in transmitting information than analog signals? 
a)
They are more powerful
b)
They carry less information
c)
They have less interference over long distances
d)
They have more interference over long distances
25.
What is true about a digital signal?
a)
They are easily distorted or affected by interference
b)
They take up more space
c)
They require more information
d)
They are generally considered more reliable
26.

Select the correct order of waves on the EMS from low to high energy

a)

Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma

b)

Gamma, X-ray, Ultra, Vis, Infra, Micro, Radio

c)

Vis, Micro, Infra, Ultra, X-ray, Gamma, Radio

d)

Micro, Radio, Vis, Infra, Ultra, X-ray, Gamma

27.

The _______________ determines the color of visible light.

a)

wavelength (and frequency)

b)

speed

c)

amplitude

d)

particles of the medium

28.

What is different about the speed of sound waves vs. the speed of light?

a)

sound waves are the FASTEST in solids (high density), while light waves are the FASTEST in gas (or no molecules)

b)

sound waves are the FASTEST in gas (low density), while light waves are the FASTEST in solids

c)

Both have the same speed all the time

d)

Both are the FASTEST in the air or gas (low density)

29.
What do all waves transmit?
a)
matter 
b)
water
c)
energy
d)
sound
30.
How can you classify energy according to its waves?
a)
According to the waves’ frequency, amplitude, and loudness.
b)
According to the waves’ wavelength.
c)
According to the waves’ crest and trough.
d)
According to its sound.
31.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
32.
What is kinetic energy?
a)
energy of work
b)
energy of motion
c)
energy of gravity
d)
energy of power
33.

What two factors affect an object's kinetic energy?

a)

area and volume

b)

mass and weight

c)

weight and height

d)

mass and speed

34.

Where would this tossed baseball have the least amount of kinetic energy?

a)

point W

b)

point X

c)

point y

d)

point z

35.

What 3 things do plants need for the process of photosynthesis?

a)

Sunlight, oxygen and sugar.

b)

Water, soil and oxygen.

c)

Sunlight, carbon dioxide and water.

d)

Sunlight, soil and water.

36.

The plants gets its nutrients from sugar, called __________.

a)

Galactose

b)

Fructose

c)

Sugar

d)

Glucose

37.
What are the products of photosynthesis?
a)
water and carbon dioxide
b)
oxygen and glucose
c)
oxygen and carbon dioxide
d)
oxygen and water
38.
What are the reactants of cellular respiration?
a)
glucose & carbon dioxide
b)
glucose & oxygen
c)
water & oxygen
d)
water & carbon dioxide
39.
What is the correct equation for cellular respiration?
a)
6O2 + C6H12O6 -> 6CO2 + 6H2O + Energy
b)
6O2 + C6H12O6 + Energy -> 6CO2 + 6H2O
c)
6CO2 + 6H2O -> 6O2 + C6H12O6 + Energy
d)
6CO2 + 6H2O + Energy -> 6O2 + C6H12O6
40.
How is the burning of fossil fuels related to global warming?
a)
Magic
b)
Fuels are hot
c)
Greenhouse effect
d)
Photosynthesis
41.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
42.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
43.

oxygen is a gas produced by _____ and used by ________

a)

plants and animals

b)

photosynthesis and carbon dioxide

c)

animals and plants

d)

carbon dioxide and photosynthesis

44.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
45.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
46.
Particles in an atom that are neutral and have no charge are 
a)
negatrons 
b)
electrons 
c)
neutrons 
d)
protons 
47.
The central region of an atom where its neutrons and protons are is called the
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
48.

The sum of the number of protons and the number of neutrons is called the _____

a)

Atomic Number

b)

Atomic Mass

c)

Atomic Symbol

d)

Atomic Name

49.

Which model below represents Bohr's model of the atom?

a)

b)

c)

d)

50.
This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.
a)

Dalton's model of the atom

b)
The "Plum Pudding Model" of the atom
c)
The "Rutherford Model" of the atom
d)
The "Quantum Mechanical Model" of the atom

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