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