Download e-book for iPad: Principles of General Chemistry, 2nd Edition by Martin S. Silberberg

By Martin S. Silberberg

ISBN-10: 0073511080

ISBN-13: 9780073511085

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Extra resources for Principles of General Chemistry, 2nd Edition

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Therefore, even though the number and unit of the quantity change, the size of the quantity remains the same. In our example, we want to convert the distance in miles to the equivalent distance in feet. Therefore, we choose the conversion factor with units of feet in the numerator, because it cancels units of miles and gives units of feet: Distance (ft) ϭ 150 mi ϫ mi 5280 ft 1 mi ==: ϭ 792,000 ft ft Choosing the correct conversion factor is made much easier if you think through the calculation to decide whether the answer expressed in the new units should have a larger or smaller number.

Plan We have to find the volume of the galena from the change in volume of the cylinder contents. 5 mL) adding it. The units mL and cm3 represent identical volumes, so the volume of the galena in mL equals the volume in cm3. We construct a conversion factor to convert the volume from mL to L. The calculation steps are shown in the roadmap on the next page. 5 Common laboratory volumetric glassware. From left to right are two graduated cylinders, a pipet being emptied into a beaker, a buret delivering liquid to an Erlenmeyer flask, and two volumetric flasks.

Heat is the energy that flows between objects that are at different temperatures. Temperature is related to the direction of that energy flow: when two objects at different temperatures touch, energy flows from the one with the higher temperature to the one with the lower temperature until their temperatures are equal. When you hold an ice cube, it feels cold because heat flows from your hand into the ice. ) Energy is an extensive property (as is volume), but temperature is an intensive property (as is density): a vat of boiling water has more energy than a cup of boiling water, but the temperatures of the two water samples are the same.

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Principles of General Chemistry, 2nd Edition by Martin S. Silberberg

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