C2 - Covalent Substances Flashcards Preview

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Flashcards in C2 - Covalent Substances Deck (15):
1

What are the forces like within a simple molecular substances?

Weak intermolecular forces.

2

What are is the melting/boiling point of simple molecular substances like and why?

Low because the intermolecular forces are easily broken.

3

What state are simple molecular substances in at room temperature?

Gas or liquid.

4

Why don't simple molecular substances conduct electricity?

They have no ions so have no charge.

5

What is a giant covalent structure?

A macromolecule with strong covalent bonds.

6

Do giant covalent structures conduct electricity?

No, not even when molten.

7

Name 3 examples of giant covalent structures.

1) diamond.
2) silica.
3) graphite.

8

How many covalent bonds does diamond form and how does this affect its structure?

4 covalent bonds.

It is rigid.

9

Name a use of diamond.

Drill tips.

10

What is silica?

Sand.

11

What is each grain of silica?

One giant structure of silicon & oxygen.

12

How many bonds does graphite form? How does this affect its structure?

3 covalent bonds.

It has sliding layers with weak intermolecular forces, making it soft.

13

Name a use of graphite.

Pencils.

14

Why does graphite conduct electricity?

It has delocalised electrons.

15

What are simple molecular substances?

Small molecules with strong covalent bonds.