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Mid-Term Review 8th Grade Physical Science 4
Test Description: Use this to help you study for the test.
Instructions: Answer all questions to get your test result.
1) A scientist manipulates the light 3 plants receive, and then measures their growth. Light is
A
independent variable
B
control
C
hypothesis
D
dependent variable
2) Which of the following statements does not apply to a compound?
A
it is made of two or more elements
B
it can be chemically broken down into elements or compounds
C
it has components that are joined in fixed proportions
D
it can be separated into components by physical methods
3) One of the most influential factors in determining an element's reactivity is _______________.
A
how many valence electrons it has.
B
the size of its nucleus.
C
whether or not it is flammable.
D
how much of it is present during a reaction.
4) All of the following are clues that a chemical change has occurred except for ________________
A
new substances formed
B
mass changes
C
solid precipitate formed
D
color changes
5) In a covalently bonded molecule, the electrons between elements are
A
not involved with the bonding process.
B
destroyed
C
shared between the atoms.
D
transferred from one element to the other.
6) Which of the following represents a chemical change?
A
nail rusting
B
ice melting
C
wood splitting in two
D
salt being added to water
7) A scientist waters plants different amounts and measures their growth. The growth is the
A
control
B
dependent variable
C
hypothesis
D
independent variable
8) Which of these substances is a compound?
A
air
B
oxygen
C
copper
D
water
9) The two sides of a chemical equation are called
A
variables and controls
B
ingredients and outcomes
C
reactants and products
D
coefficients and subscripts
10) True or False: Phase Change is a CHEMICAL change.
A
False
B
N/A
C
N/A
D
True
*select an answer for all questions
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