Bonding Flashcards
What is the BP and MP of simple covalent compounds?
Low - weak intermolecular forces.
What is the MP and BP of giant covalent structures?
High - around 3000-4000*C - many strong covalent bonds.
What is the BP and MP of ionic compounds?
High - around 800-3000*C - a lot of energy is required to break ionic bonds.
What is the conductivity of covalent structures?
Varied. Some conduct (graphite), some don’t (diamond).
What is the conductivity of ionic structures?
They conduct electricity when dissolved in water - free ions.
What type of force holds ionic bonds?
Electrostatic force.
Which bonds are weak in giant covalent structures?
The intermolecular forces between molecules.
Why do giant covalent structures have high MP and BP?
An enormous amount of energy is required to break down the structure.
What is the conductivity of simple covalent compounds?
No conductivity.
Why can pure metals be bent?
The layers of atoms can slide and move.
What are the MP and BP of metals?
High.
What makes nanoparticles good?
They have a high surface area to volume ratio, so they are highly reactive. A high proportion of their atoms/molecules are at the surface.
What is the range of size for nanoparticles?
From 100nm to 1nm.
What can nanoparticles be used as?
Catalysts to speed up a reaction. They are also used in sunblock to block UV light. They are also used in computers as nanowires with improved memory capacities and speeds.
What are the risks of nanoparticles?
- They can be inhaled and damage lungs.
- They could enter the bloodstream and cause unpredictable effects on the cells.
