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