Revision of water and solution

Revision of water and solutionPhysical characteristics of waterComposition of water evaporation of water Solution and solubilityAcid and alkaliMethod of water purificationPreservation of water quality

Physical characteristics of water

Composition of water

cathode = hydrogen, produce pop soundAnode = oxygen, lighted glowing splinter evaporation of water

Factors effecting rate of evaporationHumidityTemperature of surroundingSurface airMovement of airSolution and solubility

Factors affecting rate of dissolvingi) size of soluteii) stirringiii) temperature of solventiv) volume of solvent

diluteconcentratedsaturatedAcid and alkali acid alkalisour taste bitter tasteCorrosive corrosiveblue to red red to bluePh value less than 7 ph value more than 7React with most metalNeutralisationEquation Acid + alkali salt + water

waterSources sea river pond

rain springs wellMethods of purificationBoilingChlorinationDistillationfiltration

Preservation of water quality

Water pollutantDomestic wasteIndustrial wasteMud and slitChemical substancesOil spillseffectCause diseasesReduce aquatic lifeRadioactive waste cause cancerAquatic life poisonedOil spills