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**8th Grade Science Final Review** Flashcards | StudBud
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**8th Grade Science Final Review**
**8th Grade Science Final Review**
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8th grade physical science final exam review #final #8thgrade
Flashcards
55 cards
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Practice quiz
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Questions
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Answers
1
Pick one abiotic factor in this picture.
Deer
Frog
Sun
Lilly pad
2
Baking soda and vinegar creates bubbles
Physical Change
Chemical Change
3
In the equation H
2
+ O
2
--> 2H
2
O, the number 2 before H
2
O is a
coefficient
mistake
subscript
superscript
4
What happens to electrons when atoms bond?
Always lost
Always gained
Stored & not used
Shared or transferred
5
What is this?
Food Pyramid
Food web
Food chain
Fine dining
6
Which of these is CHEMICAL change that can happen to iron?
Iron melting into liquid iron
Iron turning red with paint
Iron being molded into a hammer
Iron turning red with rust
7
Which type of heat transfer applies to the ground warming air molecule?
Convection
Radiation
Condensation
Conduction
8
How are atoms and elements related?
Elements can form into atoms
Elements are smaller than atoms
All elements contain different atoms
Every element has one kind of atom
9
Exothermic reactions __ energy and __ temperature.
absorb; increase
release; decrease
release; increase
absorb; decrease
10
An interaction when one organism hunts, captures, and eats another organism is called ___.
commensalism
mutualism
predation
parasitism
11
The Law of Conservation of Mass stated this about chemical reactions/equations __
Products are greater than reactants
Products are less than reactants
Reactants are greater than products
Products equal reactants
12
Chocolate melting
Chemical Change
Physical Change
13
What is the smallest amount of salt (NaCl) you can have?
one salt molecule
one salt atom
one sodium atom
one chlorine atom
14
At the top of a tall mountain, which is true?
Density is lower and it's colder
Density is lower and it's hotter
Density is higher and it's colder
Density is higher and it's hotter
15
Carbon and oxygen atoms can combine to form the gas called carbon dioxide.
It's a different atom
It is a new element
It's a molecule made up of atoms
It's a gas so it doesn't have atoms
16
Which of these is PHYSICAL change that can happen to water (H
2
O)?
Water is frozen into ice cubes
Water is broken down into H and O atoms
Water vapor condenses into droplets on the grass
Water is mixed with sugar
17
If you describe the climate of a place, which of these would be most accurate?
Possible snow
Sunny with high humidity
Hot, dry with little rainfall
Rainy and cold until Thursday
18
What is needed to start or change motion?
A balanced force
Speed
Acceleration
An unbalanced force
19
What does it mean the forces are balanced?
No change, same as no effect at all
Positive net force downwards
Applied force is increased, faster
First force is unbalanced by the second force
20
Molecules always move from areas of ____ pressure to areas of ____ pressure.
high to low
low to high
no to more
they don't
21
Iron combines with oxygen in the air to form rust. What is rust?
coefficient
subscript
product
reactant
22
In the equation H
2
+ O
2
--> 2H
2
O, the product is
H2+O2
2H2O
H2
O2
23
What is density?
The amount of space an object takes up
The amount of mass in a certain volume
The amount of matter an object has
The measure of calculated volume
24
A force that causes an object to slow down.
buoyancy
friction
acceleration
fraction
25
What is an example of water (H2O) undergoing a chemical change?
Dissolving sugar into the water
Freezing water
Breaking down to form H & O
Boiling water
26
Wind always moves from areas of __ density/pressure to __ density/pressure.
(cold) high to (warm) low
no to the most
(warm) low to (cold) high
the most to no
27
What type of air masses and biome climate would you expect to find near the Equator?
Cold and moist; Temperate
Cold and dry; Tundra
Warm and moist; Tropical
Warm and dry; Desert
28
Releases energy and increases temperature (feels warmer)
thermal shirt
exothermic
subthermic
endothermic
29
Which of the following sub-atomic particle has a negative charge?
photon
electron
proton
neutron
30
Endothermic reactions __ energy and __ temperature.
release; increase
absorb; increase
release; decrease
absorb; decrease
31
Water changing states of matter from liquid to a gas? Molecules gain energy & move faster
evaporation
freezing
melting
condensation
32
Which compound has a 1:2 ratio of atoms?
CO2
CO
H2O
H2O2
33
Absorbs energy and decreases temperature (feels colder)
thermal shirt
subthermic
endothermic
exothermic
34
Iron rusting
Chemical Change
Physical Change
35
Which of the following is not a property of a metal?
Malleable
Shiny
Gas at room temp
Excellent conductor
36
A pure substance is any substance that contains
one type of atom
None of the above
one type of compound
both A & B
37
Which type of heat transfer applies to wind & ocean patterns as they cycle the Earth's surface?
Condensation
Convection
Radiation
Conduction
38
What must you have for the water cycle to occur?
Chemical reactions
Pollution
Force
Heat (energy)
39
How do the properties of a molecule compare to the atoms bonded inside of it?
they don't have properties
they are the same
molecules don't exist
they are different
40
What is this?
Consumer
Prey
Predator
Producer
41
An object with more mass will have more __, resistance to a change in motion.
density
acceleration
inertia
volume
42
What happens when a chemical bond is broken?
Chemistry doesn't have energy
Energy creates forces through broken bonds
Energy is not absorbed or released
Energy is absorbed or released
43
Which of the following sub-atomic particle has no charge?
proton
neutron
electron
photon
44
Which of the following is a way that human interactions are helping the ecology of Earth?
Industrializing animal habitats
Hunting endangered species
Ignoring evidence of Global Warming
Inventing ways to use less oil & fuels
45
A parachute opens, increasing surface area, allowing contact with more air molecules increasing
air pressure
speed
air resistance
velocity
46
A sodium atom forms a (1+) sodium ion by
losing 2 electrons
gaining 2 electrons
gaining 1 electron
losing 1 electron
47
Define an atom
Has mass but not volume
Smallest thing you can see
Amount of matter in an object
Basic unit of matter
48
Heating water to 100°C creates bubbles
Chemical Change
Physical Change
49
What is this? (Includes biotic and abiotic factors)
Population
Ecosystem
Species
Organism
50
The water molecules lose energy and move more slowly, becoming a liquid.
Evaporation
Melting
Condensation
Freezing
51
Temperature (heat) is actually a measure of __.
wave amplitude
wavelength
energy
volume
52
Which of the following is the positively charged sub-atomic particle?
electron
proton
photon
neutron
53
If an equation is balanced, then there's the same # of ___ in the reactants & the products.
coefficients
subscripts
substances
atoms of each element
54
Without a seat belt, you fly forwards with same motion the car was moving in because of __.
air resistance
density
gravity
inertia
55
An element is a VERY reactive metal, with one valence e-. Where would that it be found?
Group 1: Alkali Metals
Group 2: Alkaline Earth Metals
Group 17: Halogens
Group 18: Noble Gases
