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Chemistry C2 Rev.
Question | Answer |
---|---|
What is an ISOTOPE? | Different atomic forms of the same element, which have the same number of protons but a different number of neutrons |
What is IONIC BONDING? | When atoms lose or gain an electron |
What is COVALENT BONDING? | When atoms share an electron |
What is an EXOthermic reaction? | Transfers energy/heat to surroundings |
What is an ENDOthermic reaction? | Energy is taken from surroundings and into reaction |
What is an ACID? | A substance with a PH less than 7 |
What is a BASE | A substance with a PH more than 7 and is used to neturalise a reaction |
What is an ALKALI | A base that dissolves in water |
What is ELECTROPLATING? | Uses electrolysis to coat the surface of on metal with another |
What are the features of DIAMOND? | -Four strong covalent bonds -Very rigid -High MP -Insoluble in water -Not conduct electricity/heat |
What are the features of GRAPHITE | -3 covalent bonds -Layers which are free to slide over eachother - Soft -High MP -Each carbon atom has one delocalised electron which allows it to conduct heat/electricity |
What is THERMOSETTING polymer | -Consists of polymer chains with cross links between them -Strong tough hard rigid - Strong intermolecular forces |
What is a THERMOSOFTENING polymer | -Consists of individual tangled polymer chains - Melts easily - Weak intermolecular forces - Chains are free to slide over eachother |
What 4 things affect the rate of a reaction? | Temperature, Concentration, Catalyst, SA of solids |
ACID + METAL -> | SALT + HYDROGEN |
ACID + BASE -> | SALT + WATER |
ACID + CARBONATE -> | SALT + WATER + CARBON DIOXIDE |
Why is CRYOLITE used in the extration of aluminium | To lower the temperature and costs |