Although large crystals of sugar (rock candy) and large crystals of salt (rock salt) have different geometric shapes, they look much the same to the untrained observer. What physical tests other than taste might be performed to distinguish between these two crystalline substances?

Q: Estimate the boiling point of CS2.

A: Given: CS2

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A: It is the simplest formula for a molecule i.e. Glucose (C6H12O6) has an empirical formula of CH2O.

Q: A liquid will expand to take the shape of its container. O True O False

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Q: shapes of molecules determine many of their properties. Imagine molecules of water having a linear…

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Q: Which of the following could describe a liquid?   I II III All of them None of them

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Q: 3. True or false: Because dry ice sublimes, carbon dioxide has no liquid phase. (a) True (b) False

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Q: Give some examples of Metallic Solids?

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Q: Boron nitride is the second hardest substance known (next to diamond). It has a very high melting…

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A:

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Q: List the major classes of minerals and discuss the main chemical characteristic of each class.

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Q: Briefly explain the difference between particle and crystal size

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Q: Single crystals are translucent but most crystalline solids appear white.3 Explain this observation.

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Q: Does the diagram best describe a crystalline solid, a liquid, or a gas? Explain.

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A: ANSWER IS :

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A:

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Q: Describe what happens on the molecular level when silica is heated and then cooled to make glass.

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Q: What is the total number of molecules in FCC crystals? Show the calculation.

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A:

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Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.