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Experimental Procedures A. Preparing the Sample: Place a pea-size mound of one of the listed compounds on a piece of paper and grind it to a fine powder using a ______.
Experimental Procedures A. Preparing the Sample: Place a pea-size mound of one of the listed compounds on a piece of paper and grind it to a fine powder using a ______.
spatula
To record the melting point range of a compound, fill two capillary tubes each to a depth of 2-4 millimeters with the compound of interest. First, get a rough idea of the approximate melting point range. Place one of the tubes in the Mel-Tem apparatus and raise the temperature a relatively fast rate, about 10 °C/minute. Record the range of temperature from the first visible evidence of liquid to the complete liquefaction of the sample. Note the temperature at which the compound first begins to melt. Allow the melting point apparatus to cool to about 20 °C below that temperature, and then insert the second tube. Raise the temperature more slowly this time, at the rate of about 2 °C/min. Note the temperatures at which: I. the first crystals melt, and; II. at which the sample has completely melted. This is the melting point range. For example, a mp range of 164-168 °C average of 166 °C indicates the sample softened or began to melt at 164 °C and that transition to a liquid was complete at 168 °C. Questions 1- If you were given a known substance for the melting point determination how could you prove it to be the specific compound and not another compound with the same melting point . 2- What is the definition of melting point . 3- What is the purpose of determining the melting point . 4What are the reasons for determining melting point . Experiment name / Determination of Boiling point Purpose: The purpose of this experiment is to determine the boiling points of various organic compounds and to use these to identify unknowns. Boiling point Definition The boiling point of an organic liquid is the temperature at which its vapor pressure equals the atmospheric pressure over the liquid or it is the temperature at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of organic compounds. Similar.
To record the melting point range of a compound, fill two capillary tubes each to a depth of 2-4 millimeters with the compound of interest. First, get a rough idea of the approximate melting point range. Place one of the tubes in the Mel-Tem apparatus and raise the temperature a relatively fast rate, about 10 °C/minute. Record the range of temperature from the first visible evidence of liquid to the complete liquefaction of the sample. Note the temperature at which the compound first begins to melt. Allow the melting point apparatus to cool to about 20 °C below that temperature, and then insert the second tube. Raise the temperature more slowly this time, at the rate of about 2 °C/min. Note the temperatures at which: I. the first crystals melt, and; II. at which the sample has completely melted. This is the melting point range. For example, a mp range of 164-168 °C average of 166 °C indicates the sample softened or began to melt at 164 °C and that transition to a liquid was complete at 168 °C. Questions 1- If you were given a known substance for the melting point determination how could you prove it to be the specific compound and not another compound with the same melting point . 2- What is the definition of melting point . 3- What is the purpose of determining the melting point . 4What are the reasons for determining melting point . Experiment name / Determination of Boiling point Purpose: The purpose of this experiment is to determine the boiling points of various organic compounds and to use these to identify unknowns. Boiling point Definition The boiling point of an organic liquid is the temperature at which its vapor pressure equals the atmospheric pressure over the liquid or it is the temperature at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of organic compounds. Similar.
spatula
To record the ______ range of a compound, fill two capillary tubes each to a depth of 2-4 millimeters with the compound of interest. First, get a rough idea of the approximate ______ range. Place one of the tubes in the Mel-Tem apparatus and raise the temperature a relatively fast rate, about 10 °C/minute. Record the range of temperature from the first visible evidence of liquid to the complete liquefaction of the sample. Note the temperature at which the compound first begins to melt. Allow the ______ apparatus to cool to about 20 °C below that temperature, and then insert the second tube. Raise the temperature more slowly this time, at the rate of about 2 °C/min. Note the temperatures at which: I. the first crystals melt, and; II. at which the sample has completely melted. This is the ______ range. For example, a mp range of 164-168 °C average of 166 °C indicates the sample softened or began to melt at 164 °C and that transition to a liquid was complete at 168 °C. Questions 1- If you were given a known substance for the ______ determination how could you prove it to be the specific compound and not another compound with the same ______ . 2- What is the definition of ______ . 3- What is the purpose of determining the ______ . 4What are the reasons for determining ______ . Experiment name / Determination of Boiling point Purpose: The purpose of this experiment is to determine the boiling points of various organic compounds and to use these to identify unknowns. Boiling point Definition The boiling point of an organic liquid is the temperature at which its vapor pressure equals the atmospheric pressure over the liquid or it is the temperature at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of organic compounds. Similar.
To record the ______ range of a compound, fill two capillary tubes each to a depth of 2-4 millimeters with the compound of interest. First, get a rough idea of the approximate ______ range. Place one of the tubes in the Mel-Tem apparatus and raise the temperature a relatively fast rate, about 10 °C/minute. Record the range of temperature from the first visible evidence of liquid to the complete liquefaction of the sample. Note the temperature at which the compound first begins to melt. Allow the ______ apparatus to cool to about 20 °C below that temperature, and then insert the second tube. Raise the temperature more slowly this time, at the rate of about 2 °C/min. Note the temperatures at which: I. the first crystals melt, and; II. at which the sample has completely melted. This is the ______ range. For example, a mp range of 164-168 °C average of 166 °C indicates the sample softened or began to melt at 164 °C and that transition to a liquid was complete at 168 °C. Questions 1- If you were given a known substance for the ______ determination how could you prove it to be the specific compound and not another compound with the same ______ . 2- What is the definition of ______ . 3- What is the purpose of determining the ______ . 4What are the reasons for determining ______ . Experiment name / Determination of Boiling point Purpose: The purpose of this experiment is to determine the boiling points of various organic compounds and to use these to identify unknowns. Boiling point Definition The boiling point of an organic liquid is the temperature at which its vapor pressure equals the atmospheric pressure over the liquid or it is the temperature at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of organic compounds. Similar.
melting point
Boiling point Definition The boiling point of an ______ liquid is the temperature at which its vapor pressure equals the atmospheric pressure over the liquid or it is the temperature at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of ______ compounds. Similar.
Boiling point Definition The boiling point of an ______ liquid is the temperature at which its vapor pressure equals the atmospheric pressure over the liquid or it is the temperature at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of ______ compounds. Similar.
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To record the melting point range of a compound, fill two capillary tubes each to a depth of 2-4 millimeters with the compound of interest. First, get a rough idea of the approximate melting point range. Place one of the tubes in the Mel-Tem apparatus and raise the ______ a relatively fast rate, about 10 °C/minute. Record the range of ______ from the first visible evidence of liquid to the complete liquefaction of the sample. Note the ______ at which the compound first begins to melt. Allow the melting point apparatus to cool to about 20 °C below that ______, and then insert the second tube. Raise the ______ more slowly this time, at the rate of about 2 °C/min. Note the ______s at which: I. the first crystals melt, and; II. at which the sample has completely melted. This is the melting point range. For example, a mp range of 164-168 °C average of 166 °C indicates the sample softened or began to melt at 164 °C and that transition to a liquid was complete at 168 °C. Questions 1- If you were given a known substance for the melting point determination how could you prove it to be the specific compound and not another compound with the same melting point . 2- What is the definition of melting point . 3- What is the purpose of determining the melting point . 4What are the reasons for determining melting point . Experiment name / Determination of Boiling point Purpose: The purpose of this experiment is to determine the boiling points of various organic compounds and to use these to identify unknowns. Boiling point Definition The boiling point of an organic liquid is the ______ at which its vapor pressure equals the atmospheric pressure over the liquid or it is the ______ at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of organic compounds. Similar.
To record the melting point range of a compound, fill two capillary tubes each to a depth of 2-4 millimeters with the compound of interest. First, get a rough idea of the approximate melting point range. Place one of the tubes in the Mel-Tem apparatus and raise the ______ a relatively fast rate, about 10 °C/minute. Record the range of ______ from the first visible evidence of liquid to the complete liquefaction of the sample. Note the ______ at which the compound first begins to melt. Allow the melting point apparatus to cool to about 20 °C below that ______, and then insert the second tube. Raise the ______ more slowly this time, at the rate of about 2 °C/min. Note the ______s at which: I. the first crystals melt, and; II. at which the sample has completely melted. This is the melting point range. For example, a mp range of 164-168 °C average of 166 °C indicates the sample softened or began to melt at 164 °C and that transition to a liquid was complete at 168 °C. Questions 1- If you were given a known substance for the melting point determination how could you prove it to be the specific compound and not another compound with the same melting point . 2- What is the definition of melting point . 3- What is the purpose of determining the melting point . 4What are the reasons for determining melting point . Experiment name / Determination of Boiling point Purpose: The purpose of this experiment is to determine the boiling points of various organic compounds and to use these to identify unknowns. Boiling point Definition The boiling point of an organic liquid is the ______ at which its vapor pressure equals the atmospheric pressure over the liquid or it is the ______ at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of organic compounds. Similar.
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To record the melting point range of a compound, fill two capillary tubes each to a depth of 2-4 millimeters with the compound of interest. First, get a rough idea of the approximate melting point range. Place one of the tubes in the Mel-Tem apparatus and raise the temperature a relatively fast rate, about 10 °C/minute. Record the range of temperature from the first visible evidence of liquid to the complete ______ of the sample. Note the temperature at which the compound first begins to melt. Allow the melting point apparatus to cool to about 20 °C below that temperature, and then insert the second tube. Raise the temperature more slowly this time, at the rate of about 2 °C/min. Note the temperatures at which: I. the first crystals melt, and; II. at which the sample has completely melted. This is the melting point range. For example, a mp range of 164-168 °C average of 166 °C indicates the sample softened or began to melt at 164 °C and that transition to a liquid was complete at 168 °C. Questions 1- If you were given a known substance for the melting point determination how could you prove it to be the specific compound and not another compound with the same melting point . 2- What is the definition of melting point . 3- What is the purpose of determining the melting point . 4What are the reasons for determining melting point . Experiment name / Determination of Boiling point Purpose: The purpose of this experiment is to determine the boiling points of various organic compounds and to use these to identify unknowns. Boiling point Definition The boiling point of an organic liquid is the temperature at which its vapor pressure equals the atmospheric pressure over the liquid or it is the temperature at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of organic compounds. Similar.
To record the melting point range of a compound, fill two capillary tubes each to a depth of 2-4 millimeters with the compound of interest. First, get a rough idea of the approximate melting point range. Place one of the tubes in the Mel-Tem apparatus and raise the temperature a relatively fast rate, about 10 °C/minute. Record the range of temperature from the first visible evidence of liquid to the complete ______ of the sample. Note the temperature at which the compound first begins to melt. Allow the melting point apparatus to cool to about 20 °C below that temperature, and then insert the second tube. Raise the temperature more slowly this time, at the rate of about 2 °C/min. Note the temperatures at which: I. the first crystals melt, and; II. at which the sample has completely melted. This is the melting point range. For example, a mp range of 164-168 °C average of 166 °C indicates the sample softened or began to melt at 164 °C and that transition to a liquid was complete at 168 °C. Questions 1- If you were given a known substance for the melting point determination how could you prove it to be the specific compound and not another compound with the same melting point . 2- What is the definition of melting point . 3- What is the purpose of determining the melting point . 4What are the reasons for determining melting point . Experiment name / Determination of Boiling point Purpose: The purpose of this experiment is to determine the boiling points of various organic compounds and to use these to identify unknowns. Boiling point Definition The boiling point of an organic liquid is the temperature at which its vapor pressure equals the atmospheric pressure over the liquid or it is the temperature at which the vapor and liquid phases are in equilibrium at a given pressure. the boiling point is considered as a criterion of purity of a compound and is useful for identification of organic compounds. Similar.
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The ______ barked
The ______ barked
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The ______ meowed
The ______ meowed
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The ______ sang
The ______ sang
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Study Notes
Purpose of Melting Point Determination
- Determine the purity of a substance as a physical property by analyzing its melting point.
- Identify an unknown compound through melting point comparisons.
- Use mixture melting point techniques to help identify unknown compounds.
- Learn accurate melting point measurement techniques with the Mel-Temp apparatus.
Importance of Melting Point
- Indicates purity levels: Pure substances melt within a narrow temperature range; impurities widen this range, typically exceeding 2 degrees.
- Aids in the identification of unknown samples by narrowing down possibilities based on reproducible melting point ranges of pure solids.
- Characterizes new compounds through their distinct melting point behavior.
Melting Point Definition
- Melting point is defined as the temperature at which a solid begins to liquefy, continuing until all solid turns to liquid.
- Melting point range is the temperature interval from the initial formation of liquid to the complete liquefaction of the solid.
- Example: Pure sucrose has a melting point of 1850-1860°C, illustrating consistent behavior of pure substances.
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Description
Test your knowledge on the determination of melting point of substances and its applications. Explore the methods for determining purity, identifying unknown compounds, and obtaining accurate melting points using a Mel-Temp apparatus.
