CHEM 1122 Lecture Notes - Lecture 3: Potassium Nitrate, Oxyanion, Oxoacid
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Document Summary
Sodium and chlorine (nacl) - both extremely reactive and poisonous but the compound of formed from these two elements (sodium chloride) is harmless and we call it table salt. When elements combine to form compounds, their properties completely change. Sugar - compound composed of carbon, hydrogen, and oxygen. Each specific element has it"s own distinct properties but combined it makes sugar. Compound display constant composition free atoms are rare in nature. Mixture of hydrogen and oxygen gas - can contain any proportions of hydrogen and oxygen. Water (compound) - water molecules that consist of two hydrogen atoms bonded to one oxygen atom = definite proportion of hydrogen and oxygen. Compound = elements combine in fixed, definite proportions. Mixture = any proportions law of constant composition - all samples of a given compound have the same proportions of their constituent elements.
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