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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 seven electrons in the outer energy levels.
C
They have empty outer energy levels.
D
They have no electrons.
2) In an atom, electrons ____.
A
are located in the nucleus
B
are paired with neutrons
C
travel outside the nucleus
D
are always in the same place in an atom
3) The energy levels of an atom are occupied by ____.
A
electrons
B
ions
C
neutrons
D
protons
4) An atom with _____ valence electrons is most stable.
A
1
B
7
C
3
D
8
5) Most of the mass of an atom is found in its ____.
A
electron cloud
B
orbit
C
valence level
D
nucleus
6) In the chemical formula H2O, how many atoms of oxygen are represented?
A
1
B
2
C
0
D
3
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
The mass of products is sometimes greater
B
There is no relationship.
C
The masses are always equal.
D
The mass of reactants is greater
8) In a reaction that has one reactant and two products, the _____.
A
mass of the products is not related to the mass of the reactants
B
products have twice as much mass as the reactants
C
mass of the products is four times the mass of 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
neutral
C
positive
D
negative
10) A soccer ball takes 20 s to roll 10 m. What is the average speed of the soccer ball?
A
100 m/s
B
50 m/s
C
200 m/s
D
.5 m/s
11) When you graph the motion of an object, you put ____ on the horizontal axis and ____ on the vertical axis.
A
time, distance
B
distance, time
C
distance, velocity
D
velocity, time
*select an answer for all questions
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