Download Life Pre-Intermediate, Teachers Book [With 2 CDs] by David A. Hill PDF

By David A. Hill

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Extra info for Life Pre-Intermediate, Teachers Book [With 2 CDs]

Sample text

The proton is nature’s most common carrier of positive charge, equal in magnitude but opposite in sign to the charge on the electron. The number of protons in a nucleus determines what the element is. For instance, a nucleus containing only one proton is the nucleus of an atom of hydrogen, regardless of how many neutrons may be present. Extra neutrons correspond to different isotopes of hydrogen—deuterium and tritium— which react chemically in exactly the same way as hydrogen, but are more massive.

The standard reference line is usually selected to be the positive x-axis of a Cartesian coordinate system. The angle u is considered positive when measured counterclockwise from the reference line and negative when measured clockwise.

007 5 are not considered significant figures. 007 5 has two. When zeros are placed after other digits in a whole number, there is a possibility of misinterpretation. For example, suppose the mass of an object is given as 1 500 g. This value is ambiguous, because we don’t know whether the last two zeros are being used to locate the decimal point or whether they represent significant figures in the measurement. Using scientific notation to indicate the number of significant figures removes this ambiguity.

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