Covalent Bonding Flashcards
How is a covalent bond formed?
Between atoms sharing a pair of electrons.
Why are substances with simple molecular structures have low melting and melting boiling points?
The intermolecular forces are week therefore making the molecules become separated easily.
Understand covalent bonding in terms of electrostatic attraction?
There is a strong electrostatic attraction between the negatively charged shared pair of electrons and the positively charged nuclei’s.
Why do substances with simple molecular structures have in increased boiling/melting point with increasing relative molecular mass?
There are more points along the larger molecules for the intermolecular forces to act between so more energy is needed
Do covalent compounds conduct electricity?
No
Why do substances with giant covalent structures have high melting and boiling points?
All of the atoms are bonded to each other by strong covalent bonds, therefore a lot of energy would be needed to break them.
What are the properties of diamonds?
High melting point, really hard and doesn’t conduct electricity
What are the properties of graphite?
Soft and slippery, high melting point and does conduct electricity.
What are the properties of C60 fullerene?
Is soft and a poor conductor of electricity
What happens as you go down group 7 to colour and boiling point?
It increases
What happens to reactivity as you go down Group 7?
It decreases
Why does reactivity decrease when you go down group 7?
As you go down the halogens become less reactive, this makes it harder to attract the extra electron to fill the outer shell when its further away from the nucleus.
