18 Questions
What affects the strength of an ionic bond in terms of melting and boiling points?
Size and charge of the ions
Which pairing would likely have a higher melting point according to the text?
Group 2 / Group 6 (2-, 2+)
Why do solid-state ionic compounds not conduct electricity?
The lattice structure prevents ion movement
In what state do ionic compounds conduct electricity?
Liquid state or solution
Which macromolecular structure is known for its high melting point?
Diamond
What property makes graphite a good conductor of electricity?
Free-moving electrons between layers
Why are metals typically hard?
As a result of strong electrostatic attraction between metal cations and delocalised electrons
What needs to happen for atoms in a giant covalent structure to move through a solvent?
Strong covalent bonds need to be broken
What is the main reason for the high melting and boiling points of metals?
Strong electrostatic attraction between metal cations and delocalised electrons
Why is graphite an exception when it comes to solubility?
It has spare electrons
In a metallic structure, what are the particles of the 3-D lattice surrounded by?
'Sea' of delocalised electrons
What type of bonding is responsible for electrical conductivity in metals?
Metallic bonding
Why do giant covalent structures have high melting and boiling points?
The lattice particles are atoms with strong covalent bonds that need a lot of energy to break
Why is graphite able to conduct electricity?
The remaining valence electron on each carbon atom is delocalized and can move freely within the sheet
What contributes to the hardness of macromolecular (giant covalent) structures?
Rigid 3-D structure holding surface atoms in place
Why are melting and boiling points of giant covalent structures much higher than simple covalent structures?
All strong covalent bonds holding the giant lattice need to be broken, requiring a lot of energy
What makes graphite a good lubricant?
Weak forces between the sheets allow easy sliding
Why are giant covalent crystals considered insulators?
There are no charged particles in the lattice, as they consist of atoms
Learn about carbon atoms forming 4 bonds in a tetrahedral arrangement with bond angles of 109.5°. Explore properties of graphite, including its lubricant properties and electrical conductivity.
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