**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.

We'll answer the first question since the exact one wasn't specified. Please submit question specifying the one you'd like answered. Melting point is the temperature at which a pure solid substance is turned completely to the liquid state. It is the temperature where both solid and liquid phases exist in equilibrium Every solids have a fixed melting point.When impurities are present, the melting point deceases, ie, lowering of melting point occurs A pure substance has a crystal lattice structure which is arranged in a repeated pattern. The foreign substance present disturbs the regular structure. The presence of impurities decreases the number of molecules available for melting. So the melting point of the pure substance will be higher than that with impurities. Insoluble impurities don't have any effect on melting point.Answer 1) The effects of impurities on melting point of a pure substance is : The melting point decreases in presence of impurities. The presence of impurities disrupts the regular lattice structure of solids.

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Melting Point Experiment Unknown C: Melting point of Unknown C: Candidate compounds from Table 1: 1. M.P. 2. M.P. 3. M.P. 4. M.P. 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 p substance. An unknown solid has a melting point of 132-135°C. A mixed melting point of the unknown v urea, gives a melting point of 120-126°C. Based on your understanding of the effects of impurities melting points, is the unknown urea or not? Briefly explain your answer. 3. a) An unknown solid has a melting point of 112-114°C. Based on data from Table 1 above and mixed melting point technique of this experiment, you can narrow down the possibilities to ti compounds. List the compounds. 4. b) A mixed melting point of the unknown with acetanilide gives a melting point of113-114 the unknown acetanilide or not? Briefly explain your answer.

Melting Point Experiment Unknown C: Melting point of Unknown C: Candidate compounds from Table 1: 1. M.P. 2. M.P. 3. M.P. 4. M.P. 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 p substance. An unknown solid has a melting point of 132-135°C. A mixed melting point of the unknown v urea, gives a melting point of 120-126°C. Based on your understanding of the effects of impurities melting points, is the unknown urea or not? Briefly explain your answer. 3. a) An unknown solid has a melting point of 112-114°C. Based on data from Table 1 above and mixed melting point technique of this experiment, you can narrow down the possibilities to ti compounds. List the compounds. 4. b) A mixed melting point of the unknown with acetanilide gives a melting point of113-114 the unknown acetanilide or not? Briefly explain your answer.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

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**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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Preparation of 0.25N NaOH Objective: Apparatus and Materials: Procedure : Calculate the exact mass of NaOH needed to prepare 1.0L of 0.25N NaOH for standardization. Show your computations. Using the triple beam balance, weigh the desired amount of NaOH. Place the weighed amount of NaOH into the 500 mL volumetric flask and add distilled water until it reaches the mark. Agitate and transfer the solution into the reagent bottle. Add again distilled water to the same volumetric flask until it reaches the mark and pour it to the same reagent bottle, thus having a total volume of 1.0 L. Label the reagent bottle, 0.25N NaOH. Data and Computations: Conclusion: