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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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
Transcribed Image Text:**Melting Point Experiment**
**Unknown C:**
**Melting Point of Unknown C:**
- M.P.: __________
- M.P.: __________
- M.P.: __________
- M.P.: __________
**Candidate Compounds from Table 1:**
1. __________
2. __________
3. __________
4. __________
**Mixed Melting Point Ranges with Unknown C:**
- Unknown + 1:
- M.P.: __________
- Unknown + 2:
- M.P.: __________
- Unknown + 3:
- M.P.: __________
- Unknown + 4:
- M.P.: __________
**Identity of Unknown C:**
---
**Complete the following exercises in the spaces provided:**
1. Describe the effects of impurities on the melting point of a pure substance.
2. Based on your experience with this simulated experiment, what is a reasonable definition of a pure substance?
3. An unknown solid has a melting point of 132-135°C. A mixed melting point of the unknown with urea gives a melting point of 120-126°C. Based on your understanding of the effects of impurities on melting points, is the unknown urea or not? Briefly explain your answer.
4.
a) An unknown solid has a melting point of 112-114°C. Based on data from Table 1 above and the mixed melting point technique of this experiment, you can narrow down the possibilities to three compounds; list the compounds.
b) A mixed melting point of the unknown with acetanilide gives a melting point of 113-114°C. Is the unknown acetanilide or not? Briefly explain your answer.
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