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Ongoing Review 4
Test Description: Review
Instructions: Answer all questions to get your test result.
1) SI units are useful because they are all related by multiples of
A
10
B
two
C
five
D
50
2) Which of the following visual displays would be best for describing the percentages of different gases in the atmosphere?
A
bar graph
B
line graph
C
any of the above
D
circle graph
3) How many atoms of calcium are in a unit of calcium phosphate whose formula is Ca3(PO4)2
A
three
B
four
C
one
D
two
4) When Rutherford performed his metal foil experiment, he was surprised that most of the alpha particles ____________.
A
bounced back from the foil
B
were absorbed by the foil
C
were deflected by the foil
D
passed straight through the foil
5) Vegetable soup is an example of a _______________.
A
heterogeneous mixture
B
compound
C
pure substance
D
homogeneous mixture
6) When someone stirs cocoa powder into hot water or hot milk, the cocoa changes from a _________________.
A
homogeneous mixture into a non-uniform mixture
B
homogeneous mixture into a compound
C
compound into a heterogeneous mixture
D
heterogeneous mixture into a homogeneous mixture
7) A cork is able to float on water because it is ____________.
A
a crystalline solid
B
equal in density to water
C
less dense than the water
D
small in size
8) Some elements are unlikely to lose or gain electrons, but share electrons to form covalent bonds. Which of the following elements is most likely to form covalent bonds?
A
silicon (#14)
B
oxygen (#8)
C
chlorine (#17)
D
sulfur (#16)
9) What is the name given to the units that make up covalently bonded compounds?
A
molecules
B
electrons
C
ions
D
energy levels
10) Which of the following conditions would likely cause the activation energy to be high?
A
the temperature is hot
B
atoms are close together
C
a catalyst is present
D
atoms are not close together
*select an answer for all questions
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