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Exam 3: Matter and Minerals

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Question 31

True/False

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Graphite and diamonds are polymorphs because both are made up of carbon atoms.

A) True
B) False

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Question 32

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One defining characteristic of minerals is that they are found in a solid state in nature.Which of the following minerals is an exception to this rule, naturally occurring in a liquid state at room temperature?

A) Diamond
B) Ice
C) Carbon
D) Calcite

E) B) and D)
F) C) and D)

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Question 33

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Polymorphs are minerals that will have two identical mineral structures, but different chemical compositions.

The ________ are the mineral class that accounts for more than 90 percent of the Earth's crust.

Which ions-positive ions or negative ions-tend to be larger and why?

A geode contains minerals that form through biological processes.

Which of the following rocks is composed of only a single mineral?

If there are over 100 elements on the periodic table of elements, it would stand to reason that there would be millions of ways these elements could combine to form minerals.However, there are only 4000 named minerals.Why might there be so few minerals on Earth when there are so many possible combinations?

You have a solution of salt dissolved in water.Why might a drop in temperature result in the dissolved minerals precipitating out of solution?

A rock can be composed of almost entirely one mineral.

Describe how magnesium can be exchanged for iron in olivine without destroying the internal framework of the mineral.

Define the tenacity of a mineral.

________ states that the angles between equivalent faces of crystals of the same mineral are always the same.

Quartz has only one color.

Color is a reliable identification technique for minerals.

Write a simple chemical formula showing how the component elements of the silicate ion affect its net charge.

Students new to mineral identification often confuse shiny, dark-colored nonmetallic minerals for those minerals with a metallic luster.Explain how streak can be useful for telling these minerals apart.

Which is the strongest of the atomic bonds?

Which of the following is a rock composed of nonmineral matter?

Mineral species can be further subdivided into ________.