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Yghehesrhsehre Essay

1066 words - 4 pages

Chemistry study notesn(HO-C6H10O4-OH) → H-(O-C6H10O4)n-OH + (n - 1)H2OMass of barium sulfate is calculated using stoichiometryCauses of inaccurate result in lawn fertiliser analysis:-The Precipitate is very fine and can pass through filter paper-Not all the sulfate precipitated because not enough barium ions were addedPpm = mg/L1 g = 1000 mgMicroscopic membranes have uniform size pores and the thin polymer sheets are semi permeable.To assess the reliability of information -compare the information from various sources eg.internet, textbook, journals.For rusting to occur, oxygen and water must be presentIron oxidises to form iron hydroxide which then oxidise to form hydrated iron oxide.Sacrificial anodes have to be replaced as it is eaten away.Inert electrodes are carbon, stainless steel and platinum.In sacrificial anode, zinc is oxidised and water is reduced.In Applied voltage, water is being reduced an oxidisedConservation is the saving or preserving of an artefact to prevent it from further deterioration. It involves cleaning, preserving and stabilising artefact.Restoration involves restoring an artefact as close as possible to its original conditionThe main human activities that release sulfur dioxide to the atmosphere are:■ processing or burning fossil fuels■ extracting metals from sulfide ores.Halons are compounds of carbon,fluorine,bromine and other halogens.They are non-flammable and dense,good for fire extinguishers.Beta particles enters the thin window in tube of Geiger meter and ionises argon gas releasing electrons.PVC is used as insulation for electrical cables because it is a good electrical insulator.it is also hard,brittle,flexible and high thermal stability.PHB is melted and treated to produce usable polymerProperties of PHB:- It is BIODEGRADABLE and BIOCOMPATIBLEIt is non-toxic, insoluble in water, permeable to oxygen, resistant to UV light, acids and bases, high melting point, high tensile strength.Assess/Evaluate means to talk about advantage and disadvantages and draw a conclusion.One benefit of Technetium 99M is that it is non-intrusive and has half-life of 6 hours.Glucose in concentrated in brain, heart and lungs.Acidic oxides react with water to form acid and react with base to form salt and water.There are some oxides, such as ZnO, PbO and Al2O3, that react with acids toform salts, but which also react with alkalis. These are called amphoteric oxides.There is another group of oxides that do not react with either acids or bases.These are called neutral oxides. Common neutral oxides are carbon monoxide,CO, nitrous oxide, N2O, and nitric oxide, NO.For buffer questions, show the buffer acting as a base and an acid, also include another 2 equation of the formation and dissociation of carbonic acid.When blood is too acidic, hydrogen carbonate will act as a base to minimise the effect of hydrogen ion, reduces decrease in ph.Ideal condition for haber process is temperature of 400 degrees and 250 atmSalt water...

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