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8th Grade 2nd Six Weeks Test Review
Test Description: Review for 6 weeks test
Instructions: Answer all questions to get your test result.
1) Why do the noble gases NOT form compounds readily?
A
Their outer energy levels have 8 valence electrons.
B
They have no electrons.
C
They have empty outer energy levels.
D
They have seven electrons in the outer energy levels.
2) In an atom, electrons ____.
A
are always in the same place in an atom
B
are paired with neutrons
C
are located in the nucleus
D
travel outside the nucleus
3) The energy levels of an atom are occupied by ____.
A
protons
B
ions
C
electrons
D
neutrons
4) An atom with _____ valence electrons is most stable.
A
7
B
1
C
3
D
8
5) Most of the mass of an atom is found in its ____.
A
orbit
B
nucleus
C
electron cloud
D
valence level
6) In the chemical formula H2O, how many atoms of oxygen are represented?
A
0
B
2
C
3
D
1
7) According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
A
There is no relationship.
B
The masses are always equal.
C
The mass of reactants is greater
D
The mass of products is sometimes greater
8) In a reaction that has one reactant and two products, the _____.
A
mass of the products is four times the mass of the reactants
B
mass of the products is not related to the mass of the reactants
C
products have twice as much mass as the reactants
D
mass of the products is equal to the mass of the reactants
9) Atoms that gain electrons become ions with a _____ charge.
A
similar
B
negative
C
positive
D
neutral
10) A soccer ball takes 20 s to roll 10 m. What is the average speed of the soccer ball?
A
50 m/s
B
.5 m/s
C
200 m/s
D
100 m/s
11) When you graph the motion of an object, you put ____ on the horizontal axis and ____ on the vertical axis.
A
distance, velocity
B
velocity, time
C
time, distance
D
distance, time
*select an answer for all questions
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