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Chemistry revision for exams - Coggle Diagram
Chemistry revision for exams
Titrations
How to claculate temperature change
final temp-initial temp
variabels
control - keep the same
dependant - what you measure
indapendant - what you change
continuous - can take any value in a givan range
categoric - can only take a specific value
Organic Chemistry
Fractional distillation
A tall fractionating column is fitted above the mixture with several condensers coming off at different heights the column is hot at the bottom and cool at the top substances with high boiling points condense at the bottom and substances with lower boiling points condense on the way to the top
Alkanes
Cracking is used to convert long alkanes into shorter more useful hydrocarbons
Bonding and Energy Changes
Oxygen diflouride
Oxygen difluoride appears as a colourless poisonous gas with a strong peculiar odour
overall energy change
CH4+2O2 --> CO2+2H2O
initial energy
412
4 = 1648 496
2 = 992 1648+992 = 2640
Final energy
803
2 = 1606 463
4 = 1852 1606+1852 = 3458
Total energy change
2640-3458 = -818