Diamond is made of carbon atoms attached rigidly to each other in three directions making diamond very strong. Graphite, as found in a pencil, is easily broken under pressure. Since graphite is also made of carbon atoms, why might it have such a different property?
a. The carbon atoms in graphite form strong bonds along two-dimensional sheets but attach weakly between sheets.
b. The carbon atoms in graphite are a different form of carbon from that in diamond.
c. The surfaces of diamonds are treated to make them strong.
d. The carbon atoms in graphite are not arranged in a regular repeating pattern, so that it is not a crystal while diamond is.
e. Each carbon atom in graphite is only weakly attached to each of its neighboring carbons.
Question 2
What is the definition of density?
a. The amount of volume in a standard unit of mass.
b. The amount of weight in a standard unit of volume.
c. The number of moles in a standard unit of volume.
d. The amount of mass in a standard unit of volume.
e. The amount of volume in a standard unit of weight.
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