Descriptive Chemistry; Revised Volume 2
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Descriptive Chemistry; Revised Volume 2

Descriptive Chemistry; Revised Volume 2


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER VIL LAW AND THEORY ?LAWS OF DEFINITE AND MULTIPLE PROPORTIONS ?ATOMIC THEORY ?ATOMS AND MOLECULES?SYMBOLS AND FORMULAS ? EQUATIONS. Law and Theory. ? We discover facts by observation and experiment. Facts which always occur under the same circumstances soon become well established. Such facts are often summarized in a brief statement called a law. Sometimes the word law is used in the sense of the uniform behavior summarized in the brief statement. Hence, in a narrow sense, a law is a statement of a fact, but in a broad sense a law is the fact itself. Thus, the law of definite proportions (soon to be discussed) is either (1) a brief statement of the general fact of definite proportions of elements in compounds, or (2) the uniform behavior itself as far as the composition of chemical compounds is concerned. The cause of many scientific facts is unknown. The explanation we give, or the statement we make, of the cause of facts is called a theory. Laws are statements of fact, theories are statements of the supposed cause of facts. Thus we know that chemical compounds have a definite composition, because we have discovered by experiment the facts on which this law is based; and we have framed a theory, which, as far as our present knowledge is concerned, is a satisfactory explanation of the cause of the general fact of definite composition. Laws seldom change, but theories are often modified. Laws are the result of experiment, theories are the outcome of mental operations.We accept a certain theory until a more satisfactory one is proposed. If a fact is not well established or is not general, we account for it by an hypothesis. An hypothesis is a guess or supposition concerning the cause of some particular fact or set of facts, and it is usually proposed as a basis ...


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Product Details
  • ISBN-13: 9780217825948
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 182
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 021782594X
  • Publisher Date: 12 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 336 gr


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