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Science Grade 8
Test Description: Science grade 8
Instructions: Answer all questions to get your test result.
1) When water decomposes and recombines it is called
A
break down
B
None
C
decomposition reaction
D
decomposition action
2) What are chemical reactions
A
Chemical bonds break
B
All
C
2 important events happen
D
new chemical bonds form
3) What is a mixture
A
No combination
B
Combination of 1 material
C
All
D
Combination of two or more materials
4) Pure substances
A
None
B
Always consist of one type of matter throughout
C
Consists of different matter
D
Is an element
5) What are elements made up of
A
A combination of atoms
B
None
C
Just ONE kind of atom
D
Many atoms
6) What are compounds made of
A
MORE than just 1 kind of Atom
B
It ALWAYS combines with a fixed ratio
C
None
D
All
7) Elements and Compounds are
A
Both PURE substances
B
They have the same kinds of particles throughout
C
All
D
None
8) Define mixtures
A
It has no particles
B
Only sometimes
C
None
D
They ALWAYS have more than 1 kind of particle
9) Define phenomena
A
You can use pictures and words
B
All
C
None
D
Things and events that can be described and explained in scientific terms
10) What does the particle model of matter teach us
A
There forces between particles
B
Can't be seen with the naked eye
C
Matter is made up of particles that are incredibly small
D
All
11) What does the particle model of matter teach us
A
The more energy they have the faster they move
B
Spaces between particles in matter are empty
C
Particles are always moving
D
All
12) What does the particle model of matter teach us
A
The spaces contains nothing
B
Spaces between particles are not filled with air
C
None
D
All
13) Particle model of matter is useful
A
-
B
it describes matter
C
Because it describes matter in all 3 STATES
D
Nothing
14) What is the solid state
A
Particles are packed close to each other in fixed positions
B
All
C
Solid keeps it's shape
D
Can't be compressed
15) The particles in a solid state
A
none
B
Move a little bit
C
Has no energy
D
Move alot
16) Particles of Liquid state
A
The particles flow
B
All
C
Particles not very compressible
D
Particles do not have fixed positions
17) Particles in liquid state
A
particles stay close together
B
Particles move about freely
C
All
D
because the attractions are strong
18) Particles of liquid state
A
none
B
Speed of the particles move around
C
Depends on the energy of the particles
D
All
*select an answer for all questions
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