Flashcards
Covalent Bonding
Cards in this deck (24)
- 1Non-metal atoms need to ....(gain/lose) electrons in order to get a stable electronic structure.Gain
- 2In covalent bonding, atoms...(take, share) electronsShare electrons
- 3A covalent bond is...When a shared pair of electrons attracts the two atoms forming a bond.
- 4Covalently bonded substances form...Molecules
- 5When drawing covalent bonds, you only draw...The outer energy level of the atoms
- 6Carbon forms several bonds which join to give giant covalent structures called...Macromolecules
- 7What are the forces called that hold the atoms/ions together?Electrostatic forces of attraction
- 8Which direction do these forces of attraction act in?All directions
- 9Do ionic compounds have a high or low melting/boiling point? Why?High
Because the intermolecular forces are very strong. A lot of energy is needed to break them - 10Do covalently-bonded molecules have a high or low melting/boiling point? Why?Low
Because their intermolecular forces are very weak but the covalent bonds are very strong. Very little energy is needed to overcome them - 11Does a simple molecule conduct electricity when a liquid?No
There is NO overall charge in simple molecules. - 12Why are larger molecules more likely to be a liquid at room temperature rather than a gas?Because larger molecules have stronger forces of attraction which are harder to break. They would not be a solid because they do not have as strong bonds as ionic compounds.
- 13Give an example of an atom which forms a giant covalent structure...Carbon
- 14There are no.... in giant covalent structuresIntermolecular forces
Every atom is joined by covalent bonds - 15Diamond has a three dimensional structure of carbon atoms. Each atom is bonded to ... other atoms.Four
- 16Graphite is another form of carbon. Each atom is bonded to ... other atoms.Three
- 17Why is graphite so slippery and grey?Because it is made up of giant, flat two dimensional layers. There are no intermolecular forces between the layers so they can easily slide over each other
- 18In graphite, each carbon atom has one delocalised electron. What does that mean?It means that a bonding electron is no longer associated with a particular atom.
- 19Why does graphite conduct electricity and heat?Because it has delocalised electrons like the electrons in a metal.
- 20What are fullerenes?Fullerenes are molecules that make hexagonal rings of carbon atoms that form cage-like structures when joined together.
- 21Some fullerenes are...Nano-sized
- 22What are some known uses of fullerenes?Catalysts, lubricants, drug delivery and reinforcing materials.
- 23What is a catalyst?A substance that speeds up a chemical reaction. Afterwards, the catalyst is chemically changed.
- 24Giant Covalent Structures are...Insoluble in water
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- Chemistry Flashcards on Covalent Bonding, created by Charnanigan14 on 19/01/2014.
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- Charnanigan14
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