Chemistry: An Introduction to General, Organic, and Biological Chemistry, Books a la Carte Edition & Modified MasteringChemistry with Pearson eText -- ValuePack Access Card Package
1st Edition
ISBN: 9780133899573
Author: Karen C. Timberlake
Publisher: PEARSON
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Textbook Question
Chapter 2.5, Problem 2.47QAP
Write the equality and two conversion factors, and identify the numbers as exact or give the number of significant figures for each of the following:
a. A calcium supplement contains 630 mg of calcium per tablet.
b. The Daily Value (DV) for vitamin C is 60 mg.
c. The label on a bottle reads 50 mg of atenolol per tablet.
d. A low-dose aspirin contains 81 mg of aspirin per tablet.
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Experiment:
Each team will be provided with 5g of a mixture of acetanilide and salicylic acid. You will divide it into three 1.5 g portions in separate 125 mL Erlenmeyer flasks savıng some for melting point analysis. Dissolve the mixture in each flask in ~60mL of DI water by heating to boiling on a hotplate. Take the flasks off the hotplate once you have a clear solution and let them stand on the bench top for 5 mins and then allow them to cool as described below.
Sample A-Let the first sample cool slowly to room temperature by letting it stand on your lab bench, with occasional stirring to promote crystallization.
Sample B-Cool the second sample 1n a tap-water bath to 10-15 °C
Sample C-Cool the third sample in an ice-bath to 0-2 °C
Results:
weight after recrystalization and melting point temp.
A=0.624g,102-115°
B=0.765g, 80-105°
C=1.135g, 77-108
What is the percent yield of A,B, and C.
Chapter 2 Solutions
Chemistry: An Introduction to General, Organic, and Biological Chemistry, Books a la Carte Edition & Modified MasteringChemistry with Pearson eText -- ValuePack Access Card Package
Ch. 2.1 - Prob. 2.1QAPCh. 2.1 - Prob. 2.2QAPCh. 2.1 - Prob. 2.3QAPCh. 2.1 - Prob. 2.4QAPCh. 2.1 - Write the abbreviation for each of the following:...Ch. 2.1 - Write the abbreviation for each of the following:...Ch. 2.2 - Prob. 2.7QAPCh. 2.2 - Prob. 2.8QAPCh. 2.2 - Prob. 2.9QAPCh. 2.2 - Prob. 2.10QAP
Ch. 2.2 - 2.13 Indicate if the zeros are significant in each...Ch. 2.2 - 2.14 Indicate if the zeros are significant in each...Ch. 2.2 - 2.9 How many significant figures are in each of...Ch. 2.2 - How many significant figures are in each of the...Ch. 2.2 - 2.11 In which of the following pairs do both...Ch. 2.2 - 2.12 In which of the following pairs do both...Ch. 2.2 - 2.15 Write each of the following in scientific...Ch. 2.2 - 2.16 Write each of the following in scientific...Ch. 2.3 - Prob. 2.19QAPCh. 2.3 - Prob. 2.20QAPCh. 2.3 - Round off each of the following calculator answers...Ch. 2.3 - Prob. 2.22QAPCh. 2.3 - Prob. 2.23QAPCh. 2.3 - Prob. 2.24QAPCh. 2.3 - Prob. 2.25QAPCh. 2.3 - Prob. 2.26QAPCh. 2.3 - Prob. 2.27QAPCh. 2.3 - Prob. 2.28QAPCh. 2.4 - Prob. 2.29QAPCh. 2.4 - Prob. 2.30QAPCh. 2.4 - 2.31 Write the abbreviation for each of the...Ch. 2.4 - Write the abbreviation for each of the following...Ch. 2.4 - Prob. 2.33QAPCh. 2.4 - Prob. 2.34QAPCh. 2.4 - Write the numerical value for each of the...Ch. 2.4 - Prob. 2.36QAPCh. 2.4 - Prob. 2.37QAPCh. 2.4 - Use a prefix to write the name for each of the...Ch. 2.4 - Complete each of the following metric...Ch. 2.4 - Prob. 2.40QAPCh. 2.4 - Prob. 2.41QAPCh. 2.4 - Prob. 2.42QAPCh. 2.5 - Why can two conversion factors be written for an...Ch. 2.5 - Prob. 2.44QAPCh. 2.5 - Prob. 2.45QAPCh. 2.5 - Prob. 2.46QAPCh. 2.5 - Write the equality and two conversion factors, and...Ch. 2.5 - Write the equality and two conversion factors, and...Ch. 2.6 - Prob. 2.49QAPCh. 2.6 - Prob. 2.50QAPCh. 2.6 - Prob. 2.51QAPCh. 2.6 - Prob. 2.52QAPCh. 2.6 - Prob. 2.53QAPCh. 2.6 - Prob. 2.54QAPCh. 2.6 - Prob. 2.55QAPCh. 2.6 - Prob. 2.56QAPCh. 2.7 - Prob. 2.57QAPCh. 2.7 - Prob. 2.58QAPCh. 2.7 - Prob. 2.59QAPCh. 2.7 - Prob. 2.60QAPCh. 2.7 - Prob. 2.61QAPCh. 2.7 - Prob. 2.62QAPCh. 2 - In which of the fo1losing pairs do both numbers...Ch. 2 - In which of the following pairs do both numbers...Ch. 2 - Indicate if each of the following is answered with...Ch. 2 - Prob. 2.66UTCCh. 2 - Prob. 2.67UTCCh. 2 - Prob. 2.68UTCCh. 2 - Prob. 2.69UTCCh. 2 - Prob. 2.70UTCCh. 2 - Prob. 2.71AQAPCh. 2 - Prob. 2.72AQAPCh. 2 - Prob. 2.73AQAPCh. 2 - Prob. 2.74AQAPCh. 2 - Prob. 2.75AQAPCh. 2 - Prob. 2.76AQAPCh. 2 - Prob. 2.77AQAPCh. 2 - Prob. 2.78AQAPCh. 2 - Prob. 2.79AQAPCh. 2 - Prob. 2.80AQAPCh. 2 - Prob. 2.81AQAPCh. 2 - Prob. 2.82AQAPCh. 2 - Prob. 2.83AQAPCh. 2 - Prob. 2.84AQAPCh. 2 - Prob. 2.85AQAPCh. 2 - Prob. 2.86AQAPCh. 2 - Prob. 2.87AQAPCh. 2 - Prob. 2.88AQAPCh. 2 - Prob. 2.89CQCh. 2 - Prob. 2.90CQCh. 2 -
2.117 A car travels at 55 mi/h and gets 11 km/L...Ch. 2 - Prob. 2.92CQCh. 2 - Prob. 2.93CQCh. 2 - A sunscreen preparation contains 2.50% benzyl...Ch. 2 - Prob. 2.95CQCh. 2 - Prob. 2.96CQCh. 2 - Prob. 2.97CQCh. 2 - Prob. 2.98CQCh. 2 - Prob. 2.99CQCh. 2 - Prob. 2.100CQ
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