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CHE 105/110 Introduction to Chemistry - Exercises and Answers

Solids

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QUESTION ANSWER

1.

What is the difference between a crystalline solid and an amorphous solid?

1.

At the atomic level, a crystalline solid has a regular arrangement of atoms, whereas an amorphous solid has a random arrangement of atoms.

3.

Explain how the bonding in an ionic solid explains some of the properties of these solids.

3.

The oppositely charged ions are very strongly held together, so ionic crystals have high melting points. Ionic crystals are also brittle because any distortion of the crystal moves same-charged ions closer to each other, so they repel.

5.

Explain how the bonding in a covalent network solid explains some of the properties of these solids.

5.

The covalent network solid is essentially one molecule, making it very hard and giving it a very high melting point.

7.

Which type(s) of solid has/have high melting points?

7.

ionic solids, covalent network solids

9.

Which type of solid(s) is/are considered relatively soft?

9.

molecular solids

11.

Predict the type of solid exhibited by each substance.

  1. Hg
  2. PH3
  3. CaF2

11.

  1. metallic
  2. molecular solid
  3. ionic crystal

13.

Predict the type of solid exhibited by each substance.

  1. SO3
  2. Br2
  3. Na2SO3

13.

  1. molecular solid
  2. molecular solid
  3. ionic crystal

15.

Predict the type of solid exhibited by each substance.

  1. H2S
  2. Si
  3. CsF

15.

  1. molecular solid
  2. molecular solid
  3. ionic crystal

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