8th Gr Science Fall 2015: Question Preview (ID: 27881)

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A test is being conducted to determine if the amount of light a plant is exposed to effects the growth rate of the plant. Which of the following is the Independent Variable?
a) The amount of light.
b) The type of container
c) Type of seed
d) The amount of water

A firework exploding is:
a) A chemical change because it looks nasty
b) A physical change because a flame is produced
c) A chemical change because it is still a firework.
d) A physical change because a smell is produced.

The dependent variable is what is measured (depends upon the independent variable)
a) True
b) False

If you realize your hypothesis is wrong during your experiment, it is okay to go back and change it.
a) True
b) False

In a controlled experiment, only 1 variable is changed by the scientist
a) True
b) False

The first step of the scientific method is to perform an experiment
a) True
b) False

Which of the following is NOT true about the atoms of a solid?
a) Atoms are vibrating
b) Atoms are tightly packed
c) Atoms are arranged in a fixed shape and have a constant volume
d) Atoms are not moving at all

The atoms of gasses move
a) slowly
b) very quickly
c) vibrate
d) do not move at all or hardly moves

Which is true about a chemical change?
a) The change is reversible.
b) Chemical changes can only take place with liquids.
c) A new substance is created that is different than the original
d) A chemical change can only take place with a chemical.

Which of the following is true about physical changes?
a) You must be strong to make the change.
b) The matter stays the same just in a different form.
c) New matter is created.
d) Atoms rearrange to make a new substance.

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