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