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8th grade end of year science review

Total questions: 38

Worksheet time: 20mins

Name
Class
Date
1.

Which of these a part of Photosynthesis?

a)

Carbon Dioxide (CO2)

b)

Oxygen (O2)

c)

Water (H2O)

d)

Adenosine Triphosphate (ATP)

2.

What is the name of the process that human use to breathe?

a)

Photosynthesis

b)

Breath Intaking

c)

Cellular Respiration

d)

Air movementatation

3.
What classifies a substance as a mixture?
a)
Made up of two or more substances that are chemically bonded. 
b)
One substance that can not be physically separated 
c)
Two or more substances that are not chemically bonded.
d)
A substance that can not be seperated 
4.
What cannot be broken down into other substances?
a)
Compound
b)
Mixture
c)
Solids
d)
Element
5.
Mixtures are separated through ___________changes.
a)
mixture
b)
compound
c)
physical
6.
An element is made up of only one kind of _____.
a)
isotope
b)
plastic
c)
atom
d)
metal
7.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
8.
the central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
9.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
10.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
11.
When materials combine to form new compounds it is a chemical change. Which example is a chemical change?
a)
baking powder fizzing
b)
water boiling
c)
ice melting
d)
sugar cube dissolving
12.
This law states that energy cannot be created or destroyed, but it can change form.
a)
Endothermic reaction
b)
Law of Conservation of Energy
LOCOE
c)
Exothermic reaction
d)
Law of Conservation of Matter
LOCOM
13.

When a solute is dissolved in a solvent creating a clear liquid, is this chemical or physical?

a)

chemical

b)

neither chemical nor physical

c)

physical

d)

it depends

14.

When a new material is formed, this is a sign that a ___________ change has taken place.

a)

chemical

b)

physical

c)

scientific

d)

temporary

15.

True of False? When ice melts, the number of atoms remains the same.

a)

true

b)

False

16.

Which of these are physical properties of all metals?

a)

malleable

b)

good conductors of heat and electricity

c)

ductile

d)

all answers are correct

17.

Which of these substances would you expect to be a good conductor of electricity?

a)

a plastic fork

b)

a wooden block

c)

a glass jar

d)

a copper penny

18.

If a plastic toy has a mass of 100g and a volume of 10mL, what is its density?

a)

10 g/mL

b)

.01 g/mL

c)

100 g/mL

d)

you would need more information

19.
Which will result if there is increased upwelling in a coastal area?
a)
more aquatic life
b)
less nutrients in the water
c)
higher water temperatures
d)
fewer nitrates
20.
Why is water from an aquifer more likely to be cleaner than water from other sources?
a)
because it forms where fresh and salt water meet
b)
it receives water directly from precipitation
c)
it rises to the surface near the ocean
d)
pollutants are filtered by rock and soil deep within earth
21.
Which best describes characteristics of a river basin?
a)
the land drained by a river and its tributaries
b)
the land formed when rivers create estuaries and marshes
c)
the land at the mouth of a river where water flows into the ocean
d)
the land formed as a result of a river flooding
22.
Which groundwater contaminant contained in fertilizers and pesticides comes from farms?
a)
bacteria
b)
mercury
c)
nitrates
d)
sodium
23.
Which is the main source of dissolved oxygen in the ocean?
a)
underwater earthquakes
b)
decay of living organisms
c)
animals that live near the surface
d)
plants and algae that live near the surface
24.
Which of the following is a bio-indicator?
a)
current
b)
insect
c)
rock
d)
water
25.

A company that creates hair dye would most likely employ a bio-technician for which job?

a)

researching trends

b)

developing new colors

c)

creating cost effective packaging

d)

developing a product that will be safe for consumers

26.

Which is a career that would use microorganisms to remove pollutants from water?

a)

medical specialist

b)

DNA fingerprint specialist

c)

Environmental Protection Agency specialist

d)

Center for Disease Control

27.

Which use of biotechnology most benefits North Carolina agriculture?

a)

producing human vaccines

b)

producing disease resistant crops

c)

producing new medicines from bacteria

d)

producing enzymes to eliminate pollutants

28.

How does biotechnology most likely affect North Carolina’s population?

a)

Jobs are created and attract more people to the area.

b)

Research advancement causes people in need of medicines to move to the area.

c)

People are not concerned with biotechnology so the overall population is not impacted.

d)

The issue causes controversy and people hesitate to live in a state where a large amount of research takes place.

29.

A system that uses heat from the earth to regulate the temp. of the air inside.

a)

Air Conditioning

b)

Heater

c)

Geothermal System

d)

Generator

30.
Which of the following is NOT an alternative energy source?
a)
fossil fuels
b)
geothermal
c)
hydroelectric
d)
wind 
31.
Biofuel is...
a)
 Energy that comes from harnessing the movement of the air
b)
Energy that comes from the Sun
c)
A source of non- renewable energy
d)
Fuel from plant material
32.
As water flows through a dam, a generator is turned and creates enough electricity for thousands of homes. This describes...
a)
biofuels
b)
hydroelectric energy
c)
geothermal energy.
d)
potential energy
33.
One problem with ____ energy is that it produces radioactive waste. 
a)
nuclear
b)
solar
c)
tidal
d)
geothermal
34.
Oil, natural gas and coal are called ________resources because they are not easy to replace.
a)
fossil fuels
b)
cheap
c)
natural resources
d)
nonrenewable
35.
Why are fossil fuels more widely used than solar energy?
a)
Solar energy is harder to find
b)
Fossil fuels are much cheaper
c)
Fossil fuels are more abundant
d)
The sun's energy can never be harnessed
36.

Organisms that cause disease are called __________________.

a)

hosts

b)

pathogens

c)

Phagocytes

d)

Flagellum

37.

True or False: Pathogens make you sick by damaging individual cells.

a)

True

b)

False

38.

True or False: The flu is spread only by direct contact, such as kissing a person with the flu.

a)

True

b)

False

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