Chemistry in Context
Chemistry in Context
8th Edition
ISBN: 9780073522975
Author: American Chemical Society
Publisher: McGraw-Hill Education
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Chapter 11, Problem 43Q
Interpretation Introduction

Interpretation:

The additional information other than a good protein source which should be consider before eating peanut butter as a major dietary protein source has to be given.

Concept introduction:

Macronutrients:

  • • They are required in relatively large amounts.
  • • Required for the growth, metabolism and other body functions.
  • • Calories are included in the compounds containing macronutrients.
  • • There will be no toxic effect in their higher concentration.
  • • Examples include carbohydrates, proteins and fats.

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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.

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Chemistry in Context

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