By G. Tyler Miller Jr.
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Extra info for Chemistry - A Basic Introduction
Scientists indicate the uncertainty in a measurement by expressing its value using a certain number of significant figures or digits. 1 Units the Metric and SI in Measurement System Quantity Name Length Meter or metre Mass Kilogram kg Time Temperature Second sec Kelvin K of Base Symbol Unit m L Another much used For example, possible. nearest pound, The unit for it mass if is the gram (abbreviated g). 124 lb. three digits cannot be determined from such a crude measuring device. last Rules for determining the correct number of significant figures and in calculations involving measurements are given in in measurements Appendix 3 at the end of this book.
26. 40 Chapter 2 is - 100 °C? heat. 27. The same quantity of heat is put into 200 g of each substance of the pairs shown below. In each case, which substance will have the higher temperature after a given time? Explain. ) olive oil or sjlass a. A 28. many b. c. 0°C. calories of heat were added to the sample? The temperature 29. 2 X 10' J) of heat were added to the sample. What is the mass in grams of the sample? Find the 30. 0 g of the metal 160 C. 00 g tungsten filament in a light bulb absorbs 60 cal (251 J) of heat.
This superscript is not used for Kelvin temperature, since the Kelvin defined as a unit of temperature. " widelv used relic The term °K = C is or degrees Kelvin, however, is still a of an earlier version of the metric svstem. fundamen- Metric (SI) Prefixes Values of measurements can be expressed in the tal is read "100 degrees Celsius" and metric or SI units such as meters, grams, and seconds. They can also be expressed in larger or smaller units by multiplying the fundamental unit by ten some multiple of ten.