4.2.3 - Giant Covalent Substances

Question 1

What is DIAMOND made from and how are the atoms arranged !?

Answer 1

. Diamond is a form of PURE CARBON arranged into a GIANT LATTICE

Question 2

What shape are the pure carbon atoms arranged when in the form of diamond!?

Answer 2

. Tetrahedral shape

Question 3

When carbon atoms take the form of DIAMOND how many bonds does each carbon atom make !?

Answer 3

. Every Carbon makes 4 COVALENT bonds

Question 4

A lattice is a…

Answer 4

. … strong grid-like arrangement

Question 5

Does DIAMOND sublime !?

Answer 5

. Diamond does SUBLIME, and at a very high temperature

Question 6

Why does DIAMOND sublime !?

Answer 6

. Covalent bonds are very STRONG

. There are LOTS OF BONDS in the GIANT lattice

. Lots of ENERGY is required to BREAK all the bonds

Question 7

Uses of DIAMOND:

Answer 7

. Diamond is one of the HARDEST SUBSTANCES, so it is used in cutting

Question 8

Does DIAMOND conduct electricity!?

Answer 8

. It cannot conduct electricity m, as there are no freely-moving charged particles.

Question 9

Why does DIAMOND not conduct electricity!?

Answer 9

. All the ATOMS ARE NEUTRAL, and all the ELECTRONS ARE STUCK inside an atom or a bond

Question 10

What is GRAPHITE made from and how are the atoms arranged !?

Answer 10

. Graphite is another form of PURE CARBON that are arranged in a GIANT LATTICE

Question 11

How are the carbon atoms arranged within GRAPHITE !?

Answer 11

. Graphite contains layers of hexagons of carbon atoms

Question 12

How many covalent bonds does each carbon atom make within GRAPHITE !?

Answer 12

. Every Carbon makes 3 covalent bonds

Question 13

What holds the layers together within GRAPHITE!?

Answer 13

. Weak intermolecular forces between layers

Question 14

Does graphite contain delocalised electrons !?

Answer 14

. Graphite contains delocalised electrons inside each layer

Question 15

Does GRAPHITE sublime !?

Answer 15

. GRAPHITE SUBLIMES at a very high temperature

Question 16

Why does GRAPHITE Sublime !?

Answer 16

. Covalent bonds are very STRONG

. There are LOTS OF BONDS in the GIANT lattice

. Lots of ENERGY is required to BREAK all the bonds

Question 17

Uses of GRAPHITE:

Answer 17

. Graphite is SOFT and SLIPPERY because the LAYERS CAN SLIDE easily, so it is used as a SOLID LUBRICANT

Question 18

Does GRAPHITE conduct electricity!?

Answer 18

. Graphite DOES conduct electricity, as the layers contain DELOCALISED ELECTRONS that can MOVE FREELY

Question 19

What is SILICON DIOXIDE made from and how are the atoms arranged!?

Answer 19

. Silicone dioxide is made from SILICONE and OXYGEN and forms a GIANT COVALENT STRUCTURE

Question 20

What is SILICONE DIOXIDE also known as !?

Answer 20

. Silica

Question 21

How many covalent bonds does every (Si) make within SILICONE DIOXIDE!?

Answer 21

. Every Silicon makes 4 covalent bonds

Question 22

How many covalent bonds does every (O) make within SILICONE DIOXIDE !?

Answer 22

. Every oxygen makes 2 covalent bonds

Question 23

What shape are the atoms arranged when in the form of SILICONE DIOXIDE!?

Answer 23

. Tetrahedral Shape
( strong, grid-like arrangement)

Question 24

What are the properties of SILICONE DIOXIDE !?

Answer 24

. Similar properties to diamond, due to similar bonding and structure

Question 25

Why is SILICONE DIOXIDE much less expensive than DIAMOND!?

Answer 25

. It is much less rare