By Bobby Stanton, Lin Zhu, Charles H. Atwood
Cutting edge and self-directed, EXPERIMENTS as a rule CHEMISTRY: that includes MEASURENET, second variation prepares scholars for the laboratory atmosphere by way of asking them multi-component questions, development their wisdom from earlier experiments, and incorporating the leading edge MeasureNet community information assortment process into the handbook. MeasureNet improves the laboratory event through requiring smaller quantities of chemical substances for experiments--making the lab more secure and extra environmentally friendly--and drastically expanding precision via its digital facts assortment, research, and aid positive aspects.
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Additional resources for Experiments in General Chemistry: Featuring MeasureNet (2nd Ed.)
28. How do you determine the equilibrium temperature of the hot solidcold water mixture in the calorimeter? How do you determine the temperature changes for the hot solid and the cold water? Should these temperatures be recorded in the Lab Report and to how many significant ﬁgures? 29. What calculations are required to determine the speciﬁc heat of the unknown solid? From the results of Trials 1 and 2, determine the average speciﬁc heat of the unknown solid. 30. Using the information provided in Table 1, identify the unknown solid.
2. Calculate the stoichiometric ratio for the mass loss of CO2 and H2O per gram of NaHCO3. 3. Determine the total mass loss of CO2 and H2O after three heating-cooling cycles. 4. Determine the mass of NaHCO3 in the mixture. 5. Determine the percent by mass of NaHCO3 and KCl in the mixture.
2 E X P E R I M E N T 2 Post-Laboratory Questions 1. In Step 13 of the procedure, you were instructed not to let the thermometer touch the bottom or the walls of the test tube when heating the unknown solid. Why was this instruction given? ß 2010 Brooks/Cole, Cengage Learning 2. 0 grams of solid B are each heated to 200 8C. Each solid is added to different beakers containing 25 grams of water at 25 8C. The equilibrium temperature of solid A is signiﬁcantly higher than that of solid B.