Introductory Chemistry: Concepts and Critical Thinking (8th Edition)
8th Edition
ISBN: 9780134421377
Author: Charles H Corwin
Publisher: PEARSON
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Chapter 7, Problem 5E
Interpretation Introduction
Interpretation:
The statement that is evidence of a
Concept introduction:
The changes in the state of the substance are referred to as physical changes. The physical changes do not involve the changes in the chemical structures of the substances. Chemical changes involve the changes in the chemical structure of the substances.
The chemical reaction can be identified by the changes shown below.
• Release of gas during the reaction.
• Formation of an insoluble solid in a solution.
• Change in color of the substance.
• Energy is either released or absorbed.
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Dr. Mendel asked his BIOL 260 class what their height was and what their
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A. Is height a heritable trait? If yes, what is the heritability value? (2 pts)
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75
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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 7 Solutions
Introductory Chemistry: Concepts and Critical Thinking (8th Edition)
Ch. 7 - Prob. 1CECh. 7 - Prob. 2CECh. 7 - Prob. 3CECh. 7 - Prob. 4CECh. 7 - Prob. 5CECh. 7 - Prob. 6CECh. 7 - Prob. 7CECh. 7 - Prob. 8CECh. 7 - Prob. 9CECh. 7 - Prob. 10CE
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