Get Chemistry, Tenth Edition PDF

By Raymond Chang

ISBN-10: 0073511099

ISBN-13: 9780073511092

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Extra resources for Chemistry, Tenth Edition

Example text

If the volume is found to be 6 mL, then the actual volume is in the range of 5 mL to 7 mL. We represent the volume of the liquid as (6 ; 1) mL. In this case, there is only one significant figure (the digit 6) that is uncertain by either plus or minus 1 mL. 1 mL. 1) mL, and the actual value Any number raised to the power zero is equal to one. 1 mL. We can further improve the measuring device and obtain more significant figures, but in every case, the last digit is always uncertain; the amount of this uncertainty depends on the particular measuring device we use.

The next step includes performing experiments, making careful observations, and recording information, or data, about the system—the part of the universe that is under investigation. ) The data obtained in a research study may be both qualitative, consisting of general observations about the system, and quantitative, comprising numbers obtained by various measurements of the system. Chemists generally use standardized symbols and equations in recording their measurements and observations. This form of representation not only simplifies the process of keeping records, but also provides a common basis for communication with other chemists.

1 mL. 1) mL, and the actual value Any number raised to the power zero is equal to one. 1 mL. We can further improve the measuring device and obtain more significant figures, but in every case, the last digit is always uncertain; the amount of this uncertainty depends on the particular measuring device we use. 12 shows a modern balance. Balances such as this one are available in many general chemistry laboratories; they readily measure the mass of objects to four decimal places. 9745 g). Keeping track of the number of significant figures in a measurement such as mass ensures that calculations involving the data will reflect the precision of the measurement.

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Chemistry, Tenth Edition by Raymond Chang


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