quiz 8 Flashcards
Explain why diamond is hard
It has a giant covalent structure
it has strong covalent bonds between atoms
which are hard to break
Describe what happens to electrons in covalent bonding
They are shared between atoms
Name 3 properties of diamond
High melting and boiling points
doesnt conduct electricity
very hard
Explain why substances consisting of small molecules do not conduct electricity
The molecules don’t have an overall electrical charge
so charges cant flow
Give 3 examples of substances that consist of small molecules
oxygen,water and ammonia
When a substance consisting of small molecules is melted or boiled, identify the forces that are overcome
intermolecular forces( not covalent bonds)
Explain why diamond has a high melting and boiling point
it has a giant covalent structure
it has strong covalent bonds between atoms
which require a lot of energy to overcome
Explain why larger molecules have higher and melting boiling points than smaller ones
They have stronger intermolecular forces
which require more energy to overcome
Define polymer
A very large molecule made of smaller molecules joined together
Name the typical state that substances made of small molecules are at room temperature
liquid or gas
Give 2 typical properties of substances made of small molecules
low melting and boiling points
do not conduct electricity
How many bonds does each carbon atom have in diamond?
four
Name the type of structure that is made of billion of atoms covalently bonded together
giant covalent structure
Explain why simple molecular substances have low melting points
weak intermolecular forces require little energy to overcome
Explain why diamond does not conduct electricity
The atoms don’t have an overall charge
it doesnt have delocalised electrons
so charges cant flow
