Measurement Unit Part 1

10/25/15

So I totally understand matter and how energy transfers from solid to liquid to gas. It's basic science. But I did struggle with the difference between homogeneous and pure mixtures. To me it feels like the same thing. Then when we moved on to physical and chemical properties, I totally understood. Physical is when it can be observed without changing a substance into another substance. An example is it's boiling temperature. It's the same substance but in a different form of matter. Chemical is when it can only be observed when a substance is changed into another substance. An example is when metal rusts because there is a chemical reaction taking place. A physical change is a change that does not change the composition of a substance (ex. change of state). Chemical change are changes that result in a new substance. Filtration is just separating solids from liquids. Exactly what we did with the aspirin! Distillation uses differences in the boiling points of substances. Chromatography is based on the polarity of a substance. I'm still confused on distillation and chromatography though!

Helpful links down below!
Distillation
Chromatography
Filtration