Science Grade 8 Question Preview (ID: 42782)


Science Grade 8. TEACHERS: click here for quick copy question ID numbers.

When water decomposes and recombines it is called
a) decomposition reaction
b) decomposition action
c) break down
d) None

What are chemical reactions
a) 2 important events happen
b) Chemical bonds break
c) new chemical bonds form
d) All

What is a mixture
a) Combination of two or more materials
b) Combination of 1 material
c) No combination
d) All

Pure substances
a) Is an element
b) Always consist of one type of matter throughout
c) Consists of different matter
d) None

What are elements made up of
a) Just ONE kind of atom
b) A combination of atoms
c) Many atoms
d) None

What are compounds made of
a) MORE than just 1 kind of Atom
b) It ALWAYS combines with a fixed ratio
c) All
d) None

Elements and Compounds are
a) Both PURE substances
b) They have the same kinds of particles throughout
c) All
d) None

Define mixtures
a) They ALWAYS have more than 1 kind of particle
b) Only sometimes
c) It has no particles
d) None

Define phenomena
a) Things and events that can be described and explained in scientific terms
b) You can use pictures and words
c) All
d) None

What does the particle model of matter teach us
a) Matter is made up of particles that are incredibly small
b) Can't be seen with the naked eye
c) There forces between particles
d) All

What does the particle model of matter teach us
a) Particles are always moving
b) The more energy they have the faster they move
c) Spaces between particles in matter are empty
d) All

What does the particle model of matter teach us
a) Spaces between particles are not filled with air
b) The spaces contains nothing
c) All
d) None

Particle model of matter is useful
a) it describes matter
b) Because it describes matter in all 3 STATES
c) Nothing
d) -

What is the solid state
a) Solid keeps it's shape
b) Can't be compressed
c) Particles are packed close to each other in fixed positions
d) All

The particles in a solid state
a) Move alot
b) Move a little bit
c) Has no energy
d) none

Particles of Liquid state
a) The particles flow
b) Particles not very compressible
c) Particles do not have fixed positions
d) All

Particles in liquid state
a) Particles move about freely
b) particles stay close together
c) because the attractions are strong
d) All

Particles of liquid state
a) Speed of the particles move around
b) Depends on the energy of the particles
c) All
d) none

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