Properties Flashcards
4 solid structures
Molecular
Ionic
Giant covalent
Metallic
why do ionic crystals have high boiling and melting points?
Ionic crystals have strong electrostatic attractions between the ions.
This leads to high melting points.
Why cant ionic lattices conduct electricity as a solid
The ions are fixed in place, so ionic crystals cannot conduct electricity as a solid.
why can ionic lattices conduct electricity in a solution
In solution, the ions are mobile and can act as charge carriers. In solution, they will conduct electricity
Why are ionic lattices soluble in water
The ions are charged, and so are soluble in polar solvents like water.
Why do giant covalent have high melting & boiling points
Giant covalent crystals have strong covalent bonds throughout the entire structure.
This leads to high melting and boiling points
Are giant covalent bonds soluble?
Giant covalent structures do not dissolve in anything
Many giant covalent
many giant covalent crystals will sublime (skip melting and go straight to a gas)
Metals consist of
Metals consist of a sea of free electrons surrounding positive ion cores.
Why do metals have high melting points
The strong electrostatic attractions mean metals have high melting points.
Can metals conduct electricity as a solid?
The free delocalised electrons allow metals to conduct electricity as a solid.
Can metals conduct electricity as a liquid?
Metals can also conduct electricity as a liquid.
Are metals soluble
Metals do not generally dissolve in water.
This is because many will react with water to form metal hydroxides.
Molecular compounds intermolecular forces
Molecular compounds have very weak intermolecular forces.
Molecular compounds melting points
They have low melting points and are often liquids or gases at room temperature.
Iodine is a solid at room temperature, but chlorine is a gas, for example.
