CC7 Questions and Answers
Do simple molecular substances conduct electricity? - answerno, there's no charged
particles
Why do giant covalent bonds have such high melting point? - answerstrong covalent
bonds that contain a lot of energy to break
How do metals conduct electricity and heat? - answerthe positive ions are fixed in a sea
on delocalised electrons, which are free to move and carry charge.
are metals are insoluble in water - answeryes
two giant covalent bonds formed from carbon - answergraphite and diamonds
Properties of graphite - answerslippery, layered structure, covalent bonds in layers are
tight but intermolecular bonds between layers are weak, each carbon atom bonded to 3
other atoms, 1 delocalised electron per carbon atom
Explain the properties of graphite - answerGraphite is soft / slippery because there are
only weak intermolecular forces between layers which allow the layers to slide over one
another.
Graphite conducts electricity because there is one delocalised electron per carbon
atom. The delocalised electrons are mobile charges.
describe the structure of a diamond - answerDiamond has a giant molecular structure.
Each carbon atom is covalently bonded to 4 other carbon atoms, diamonds contains
many strong covalent bonds
Properties of diamond - answerHard
High melting point
Does not conduct electricity as there are no charged particles
What are the uses of graphite? - answerlubricant as it is slippery, electrodes as it
conducts electricity & has a high melting point
Fullerene - answera molecule of carbon that consists of atoms arranged in the shape of
a hollow sphere or closed tube
Name two fullerenes - answergraphene, C60 (buckminsterfullerene / bucky ball)
Properties of cˇ60 fullerene - answerslippery from weak intermolecular forces, low
melting point, spherical, strong covalent bonds and large surface area
Do simple molecular substances conduct electricity? - answerno, there's no charged
particles
Why do giant covalent bonds have such high melting point? - answerstrong covalent
bonds that contain a lot of energy to break
How do metals conduct electricity and heat? - answerthe positive ions are fixed in a sea
on delocalised electrons, which are free to move and carry charge.
are metals are insoluble in water - answeryes
two giant covalent bonds formed from carbon - answergraphite and diamonds
Properties of graphite - answerslippery, layered structure, covalent bonds in layers are
tight but intermolecular bonds between layers are weak, each carbon atom bonded to 3
other atoms, 1 delocalised electron per carbon atom
Explain the properties of graphite - answerGraphite is soft / slippery because there are
only weak intermolecular forces between layers which allow the layers to slide over one
another.
Graphite conducts electricity because there is one delocalised electron per carbon
atom. The delocalised electrons are mobile charges.
describe the structure of a diamond - answerDiamond has a giant molecular structure.
Each carbon atom is covalently bonded to 4 other carbon atoms, diamonds contains
many strong covalent bonds
Properties of diamond - answerHard
High melting point
Does not conduct electricity as there are no charged particles
What are the uses of graphite? - answerlubricant as it is slippery, electrodes as it
conducts electricity & has a high melting point
Fullerene - answera molecule of carbon that consists of atoms arranged in the shape of
a hollow sphere or closed tube
Name two fullerenes - answergraphene, C60 (buckminsterfullerene / bucky ball)
Properties of cˇ60 fullerene - answerslippery from weak intermolecular forces, low
melting point, spherical, strong covalent bonds and large surface area
