Tuesday, April 7, 2009

Homogeneous and Heterogeneous mixtures.







A mixture is a combination that has to be two or more substances. Most of the natural substances are almost all mixtures. If you don't know what homogenous and heterogenous mixtures are I'm here to tell you. Homogenous is a mixture that stays the same no matter what you do to it. Heterogenous however is a mixture that changes alot and indicates difference.
Here are some examples of some heterogenous mixtures and homogenous and some science things that have neither of the two mixtures. First , you may think that dry ice is a heterogenous because the longer you let it sit the more it smokes and melts, which that is change. It isn't though because dry ice is a pure substance and when something is a pure substance it can't be either. The first thing I wondered was how dry ice could be a solid, but it is because it's so cold it produces steam, and the carbon dioxide also gives off the steam of the dry ice. Some of the things that do have homogenous are all the substances that are mixed up very well. This includes cement, gravy, lemonade, and nail polish. If you think about it these substances are all mixed untill they are silky smooth. And last, but not least the heterogenous mixtures. Salty water is a heterogenous mixture along with brewed tea, coffee, soapy water and hard alcohol. These substances are always changing because the soap in the soapy water can always either getting bigger or evaporating and discinigrating. Hope you have learned as much as I ahve about these unique mixtures. Even if you are not that all into science and experimental stuff these are good things to know!!!

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