States of matter, and separating and purifying substances GapFill

Substances which contain only one kind of element or compound are called  refinedpureatomicpotable. They have a specific  densityflammabilitymelting pointstrength, which is often higher than that of  an impurea blendeda subatomica multiple-compound substance, also known as  a mixturea polymeran alloyan amalgam. 

Many mixtures containing coloured compounds can be separated using  titrationpolymerisationfiltrationchromatography. During this process, a  constantsolidfirmstationary phase, such as paper, is placed in a  mobilefluidchangeableflexible phase, such as water. The substances travel different  speedspatternsdirectionsdistances up the paper. Dividing the distance travelled by a substance by the distance travelled by the solvent gives the  percentagepHDs valueRf value.

Substances can be in one of three states of matter, which are called solid, liquid and  particleaquagassteam. Substances are different states at different  temperatureschargestimesvoltages.

Water, one of the world's most important resources, often needs to be treated before it is safe to drink, or  potableoxygenatedpuresaline. This is done by passing the water through  reservoirsfertilisersbuffersfilter beds and sterilising it using agents such as chlorine or ozone. If the water is not fresh, it may also require  neutralisationdesalinationinfusionsettling, either by distillation or using reverse osmosis. Waste water also needs treating to remove organic matter, chemicals and  planktonmicrobessaltshydrogen ions.