Diamond And Silicone

Question 1

What are the three types of giant covalent substances you should know ?

Answer 1

Silicon dioxide
Diamond
Graphite ( next deck)

Question 2

What state are giant covalent substances at room temperature ?

Answer 2

Always solids at room temperature

Question 3

Why are all giant covalent structures solid at room temperature ?

Answer 3

They all have high melting and boiling points

Question 4

Why do giant covalent molecules have high melting and boiling points ?

Answer 4

They have millions of strong covalent bonds
In order to melt/boil these substances it requires a lot of energy in the form of heat to overcome these bonds

Question 5

What element is diamond formed from ?

Answer 5

Carbon

Question 6

What does diamond contain ?

Answer 6

A huge number of covalently bonded carbon atoms

Question 7

What are the three properties of diamond ? Explain for each one

Answer 7

Extremely hard: due to the millions of covalently bonded carbon atoms

High melting/ boiling point: very high melting and boiling point due to it requiring lots of energy in the form of heat to overcome these bonds

Cannot conduct electricity: all of the outer electrons are in covalent bonds so it has no free electrons to carry a charge

Question 8

What is silicon dioxide made up of ?

Answer 8

Silicon and oxygen covalently bonded together

Question 9

What are the properties of silicon dioxide ?

Answer 9

Very high melting and boiling point: huge number of strong covalent bonds which require a lot of energy in the form of heat to overcome

Question 10

Define a giant covalent molecule ?

Answer 10

Huge numbers of non metals atoms bonded to each other by covalent bonds generally arranged into repeating lattices