Chemistry Notes - CHEMISTRY Mastering Chemistry Which...

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CHEMISTRY: Mastering Chemistry Which statement best explains the difference between a law and a theory? A theory describes what nature does; a law describes why nature does it. A law summarizes a series of related observations; a theory gives the underlying reasons for them. A law is truth; a theory is mere speculation. A solution is another name for a homogeneous mixture. For example, vodka is a solution of alcohol and water. If something has a percentage value (such as 40 % alcohol by volume), this is a good indication that you are dealing with a solution and not a pure substance. Matter can be classified into several categories. All substances are either pure chemical substances or mixtures . Mixtures can be separated into their component parts through physical means, whereas pure chemical substances require chemical or nuclear reactions to separate them. Pure chemical substances can be further divided into elements or compounds . Mixtures can be either heterogeneous or homogeneous . Homogeneous mixtures are also called solutions .
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  • Spring '07
  • BELLEW
  • Chemistry, Chemical substance, flask

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