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gcse science C4 - G
specific for ocr gateway additonal science B.
| Question | Answer |
|---|---|
| what are the three forms of carbon? | -diamond -graphite -buckiminster fullerine |
| what is the name given to different forms of the same element? | allotrope |
| what is diamond used for and why? | - cutting tools as its very hard -jewellery as its very lustrous |
| what is the bonding of diamond like? | -each carbon atom has 4 strong covalent bonds to other carbon atoms -it has a tetrahedral shape -has a giant covalent structure |
| why does diamond have a high melting point? | lots of strong covalent bonds which need to be broken |
| why doesn't diamond conduct electricity? | has no free electrons |
| why is diamond hard? | -has lots of strong covalent bonds -is in a strong covalent structure |
| what is graphite used for and why? | -pencil leads as its slippery -lubricants as its slippery -electrode as it conducts electricity and has a high melting point |
| what is the bonding in graphite like? | -each carbon atom is bonded to 3 carbon atoms by covalent bonding -it has a delocalised electron inbetween the layers -weak intermolecular forces |
| why does graphite conduct electricity? | the delocalised electron is able to move and pick up a current |
| why is graphite slippery? | has weak intermolecular forces between the layers, which allows them to slide easily over each other |
| why does graphite have a high melting point? | there are many strong covalent bonds to break |
| what is the shape of buckminster fullerine like? | hollow ball of carbon atoms |
| what name is given to hollow balls of carbon atoms? | nanotubes |
| what are nanotubes used for and why? | -semiconductors in electrical circuits -industrial catalysts, large surface area so more chance of reactants colliding with catalyst -reinforce graphite in tennis rackets -cages to trap or transport other molecules, as they have large surface areas |
| what does nanoscale mean? | dealing with individual particles |
| what is the difference between nano properties and bulk properties? | -nano properties act differently in a tiny amount -bulk properties are the normal properties of large amounts of material |
| what is the name given to different forms of the same element? | |
| what is diamond used for and why? | - cutting tools as its very hard -jewellery as its very lustrous |
| what is the bonding of diamond like? | -each carbon atom has 4 strong covalent bonds to other carbon atoms -it has a tetrahedral shape -has a giant covalent structure |
| why is diamond hard? | -has lots of strong covalent bonds -is in a strong covalent structure |
| -pencil leads as its slippery -lubricants as its slippery -electrode as it conducts electricity and has a high melting point | |
| what is the bonding in graphite like? | -each carbon atom is bonded to 3 carbon atoms by covalent bonding -it has a delocalised electron inbetween the layers -weak intermolecular forces |
| the delocalised electron is able to move and pick up a current | |
| why is graphite slippery? | has weak intermolecular forces between the layers, which allows them to slide easily over each other |
| why does graphite have a high melting point? | there are many strong covalent bonds to break |
| what name is given to hollow balls of carbon atoms? | nanotubes |
| -semiconductors in electrical circuits -industrial catalysts, large surface area so more chance of reactants colliding with catalyst -reinforce graphite in tennis rackets -cages to trap or transport other molecules, as they have large surface areas | |
| what does nanoscale mean? | |
| what is the difference between nano properties and bulk properties? | -nano properties act differently in a tiny amount -bulk properties are the normal properties of large amounts of material |
| what are the three forms of carbon? | -diamond -graphite -buckiminster fullerine |
| what is the name given to different forms of the same element? | allotrope |
| what is diamond used for and why? | - cutting tools as its very hard -jewellery as its very lustrous |
| what is the bonding of diamond like? | -each carbon atom has 4 strong covalent bonds to other carbon atoms -it has a tetrahedral shape -has a giant covalent structure |
| why does diamond have a high melting point? | lots of strong covalent bonds which need to be broken |
| why doesn't diamond conduct electricity? | has no free electrons |
| why is diamond hard? | |
| what is graphite used for and why? | -pencil leads as its slippery -lubricants as its slippery -electrode as it conducts electricity and has a high melting point |
| what is the bonding in graphite like? | |
| the delocalised electron is able to move and pick up a current | |
| why is graphite slippery? | has weak intermolecular forces between the layers, which allows them to slide easily over each other |
| why does graphite have a high melting point? | |
| hollow ball of carbon atoms | |
| nanotubes | |
| what are nanotubes used for and why? | -semiconductors in electrical circuits -industrial catalysts, large surface area so more chance of reactants colliding with catalyst -reinforce graphite in tennis rackets -cages to trap or transport other molecules, as they have large surface areas |
| what does nanoscale mean? | dealing with individual particles |
Created by:
jirwin
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