C3b
- Created by: anniedarlington
- Created on: 30-03-15 13:18
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- C3b
- universal indicator changes colour gradually, methyl orange or phenolphthalein have a definite colour change
- titration
- put known concentration in conical flask with indicator, add unknown a bit at a time with burette, especially slowly when colour change is near, regular swirls, record amount required and repeat to calculate mean
- energy and fuels
- copper used for calorimetry cans as it is such a good conductor of heat
- experimental energy content < actual energy content as heat is always lost to can or surrounding air
- Q=mcT
- Q= energy, m= mass, c=specific heat capacity, T=temperature change
- getting energy from hydrogen
- unlikely to end our dependence on fossil fuels
- hydrogen is a gas so takes up much more space than liquid, very explosive, hydrogen is either from hydrocarbons (fossil fuels) or electrolysis of water (electricity --> fossil fuels)
- unlikely to end our dependence on fossil fuels
- tests for negative ions
- carbonates = react with dilute acid and see if CO2 is formed
- sulphate ions - dilute HCl, barium chloride, white precipitate
- chloride/bromide/iodide - add dilute HNO3, then silver nitrate = white/cream/yellow
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