We generally make our first assessments based on simple human observation of a sample. McCord) believe you call 'em as you see 'em. So blood is technically a heterogeneous mixture when you properly analyze in down to the micron level. all that stuff is really much bigger (microns vs nanometer) than what is considered a solute in a true solution (a homogeneous mixture). Blood is plasma with bigger stuff in it - platletes, red blood cells. In order to know that it is really heterogeneous, you have to have equipment to look further - or you've now been told and can carry on the tradition of doing the whole gotcha! thing.īlood is the same sort of thing. The fat doesn't really dissolve fully at all - but instead of just being a big giant wad of fat (easy to see there), it is broken up into teeny tiny globules of fat and those get emulsified with some proteins to make all the parts completely mix and be homogeneous on a human perceived scale. Milk is really a bunch of fat suspended in an aqueous solution. You'll see that there are differences in the tiny bits. If you look really close - like zoom way in, maybe get a microscope and look. Seems a bit cruel doesn't it? Let me explain their reasoning. it isn't homogeneous, it is a heterogeneous mixture. ![]() But no, the book and other teachers will say ha ha ha, you're so dumb. I always assumed it was a homogenous mixture because right there on the carton it says "homogenized milk" - it is the same throughout and by golly I believe that to be true. ![]() You know, the kind you go buy in a grocery store. The classic gotcha! question in chemistry textbooks and I suppose on exams is to ask what category is milk? I'm a big believer in "watch you see is watch you get". There is a difference in the physical properties of solutions when they are truly homogeneous down to the molecular level versus just being homogeneous to a perceived level. Blurb: True Homogeneity vs Perceived Homogeneity
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