8th Grade 2nd Six Weeks Test Review: Question Preview (ID: 21918)


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Why do the noble gases NOT form compounds readily?
a) They have empty outer energy levels. b) They have no electrons. c) They have seven electrons in the outer energy levels. d) Their outer energy levels have 8 valence electrons.
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
The energy levels of an atom are occupied by ____.
a) electrons b) ions c) protons d) neutrons
An atom with _____ valence electrons is most stable.
a) 1 b) 3 c) 7 d) 8
Most of the mass of an atom is found in its ____.
a) nucleus b) valence level c) orbit d) electron cloud
In the chemical formula H2O, how many atoms of oxygen are represented?
a) 0 b) 1 c) 2 d) 3
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 mass of products is sometimes greater c) The mass of reactants is greater d) The masses are always equal.
In a reaction that has one reactant and two products, the _____.
a) products have twice as much mass as the reactants b) mass of the products is equal to the mass of the reactants c) mass of the products is four times the mass of the reactants d) mass of the products is not related to the mass of the reactants
Atoms that gain electrons become ions with a _____ charge.
a) positive b) neutral c) negative d) similar
A soccer ball takes 20 s to roll 10 m. What is the average speed of the soccer ball?
a) 200 m/s b) 100 m/s c) 50 m/s d) .5 m/s
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
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