Ongoing Review 4 Question Preview (ID: 28740)


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SI units are useful because they are all related by multiples of
a) two
b) five
c) 10
d) 50

Which of the following visual displays would be best for describing the percentages of different gases in the atmosphere?
a) circle graph
b) line graph
c) bar graph
d) any of the above

How many atoms of calcium are in a unit of calcium phosphate whose formula is Ca3(PO4)2
a) one
b) two
c) three
d) four

When Rutherford performed his metal foil experiment, he was surprised that most of the alpha particles ____________.
a) were deflected by the foil
b) bounced back from the foil
c) were absorbed by the foil
d) passed straight through the foil

Vegetable soup is an example of a _______________.
a) homogeneous mixture
b) heterogeneous mixture
c) compound
d) pure substance

When someone stirs cocoa powder into hot water or hot milk, the cocoa changes from a _________________.
a) homogeneous mixture into a compound
b) homogeneous mixture into a non-uniform mixture
c) compound into a heterogeneous mixture
d) heterogeneous mixture into a homogeneous mixture

A cork is able to float on water because it is ____________.
a) a crystalline solid
b) equal in density to water
c) small in size
d) less dense than the water

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)

What is the name given to the units that make up covalently bonded compounds?
a) molecules
b) ions
c) electrons
d) energy levels

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) atoms are not close together
d) a catalyst is present

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