chemical structures Flashcards
1
Q
why do ionic structures have such high melting points?
A
- strong forces of attraction between oppositely charged ions
- requires lots of energy to break
2
Q
why are ionic compounds brittle
A
- when force is applied ions with the same charge end up next to each other
- like charges repel
- structure falls apart
3
Q
why can‘t ionic compounds conduct when they are solid?
A
the ions are not free to move around and pass the charge
4
Q
ionic substances compounds can conduct elec when molten/ aqueous because
A
ions are free to move and can carry the charges
5
Q
metal structure
A
- positive ions
- sea of delocalised electrons
6
Q
alloy
A
mixture of two or more metals
7
Q
why do alloys tend to be harder than individual metals?
A
- they contain ions or elements of different sizes
- layers are distorted
- more difficult for layers to slide over each other
8
Q
malleable
A
hammered into shape
9
Q
ductile
A
drawn into a wire
10
Q
why do simple molecular substances have a low melting point?
A
weak intermolecular forces
require little energy to break
