Determination of Melting Point
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Questions and Answers

What is the primary factor that affects the physical properties of a compound?

  • The type of bonds holding the atoms together (correct)
  • The color of the compound
  • The odor of the compound
  • The solubility of the compound in water

    • What is the phase of matter that is typically not encountered in an organic chemistry laboratory?

  • Solid
  • Plasma (correct)
  • Liquid
  • Gas

    • What occurs when the environment around a material is changed, such as by varying the temperature or pressure?

  • The material remains in the same state of matter
  • The material's physical properties are altered
  • The material undergoes a phase transition (correct)
  • The material changes its molecular structure

    • What type of bond is formed by the transfer of electrons?

    <p>Ionic bond</p> Signup and view all the answers

    What is the type of intermolecular force that occurs between an ion and a polar molecule?

    <p>Ion-dipole</p> Signup and view all the answers

    What is the physical property of a compound that is affected by its molecular structure?

    <p>All of the above</p> Signup and view all the answers

    What is the change from one state of matter into another called?

    <p>Phase transition</p> Signup and view all the answers

    What is the difference between T1 and T2 called?

    <p>Melting Point Range</p> Signup and view all the answers

    What is the typical melting point range for a pure sample?

    <p>0.5-1 °C</p> Signup and view all the answers

    What is the purpose of determining the melting point of an organic compound?

    <p>To identify the compound and determine its purity</p> Signup and view all the answers

    What is the result if the mixed melting point is lower than the original melting point and has a wider range?

    <p>The two samples are different</p> Signup and view all the answers

    What is the purpose of gently pressing the open end of the capillary tube into the powdered sample?

    <p>To fill the tube with the sample</p> Signup and view all the answers

    What is the formula of sodium acetate?

    <p>CH₃COONa</p> Signup and view all the answers

    What is the technique used to determine the melting point of an organic compound?

    <p>Capillary tube method</p> Signup and view all the answers

    What type of intermolecular force is responsible for the attraction between polar molecules and nonpolar molecules?

    <p>Dipole - induce dipole</p> Signup and view all the answers

    What is the common name for induce dipole - induce dipole forces?

    <p>London dispersion forces</p> Signup and view all the answers

    What is the minimum requirement for hydrogen bonding to occur?

    <p>Both electronegative atoms must be from the group: F, O, N</p> Signup and view all the answers

    What is the temperature at which the solid and the liquid phase of a compound are in equilibrium at 1 atmosphere?

    <p>Melting point</p> Signup and view all the answers

    What is the range between the temperatures at which the solid begins to change into liquid and becomes completely liquid?

    <p>Melting point range</p> Signup and view all the answers

    What is the force responsible for the attraction between two nonpolar molecules?

    <p>Induce dipole - induce dipole</p> Signup and view all the answers

    What is the purpose of determining the melting point of a substance?

    <p>To determine the identity of the substance</p> Signup and view all the answers

    What is the recommended height of the sample in a capillary tube for determining melting point?

    <p>2-3 mm</p> Signup and view all the answers

    What is the condition of a compound being loaded into a capillary tube?

    <p>In a powdered form</p> Signup and view all the answers

    What is the purpose of attaching the capillary tube to a thermometer?

    <p>To measure the melting point of the sample</p> Signup and view all the answers

    What is the purpose of heating the oil bath gradually?

    <p>To prevent sudden changes in the sample's temperature</p> Signup and view all the answers

    What is the purpose of the rubber ring in the experiment?

    <p>To attach the capillary tube to the thermometer</p> Signup and view all the answers

    What is the purpose of the oil bath in the experiment?

    <p>To heat the sample</p> Signup and view all the answers

    What is the aim of the experiment?

    <p>To identify an unknown compound using its melting point</p> Signup and view all the answers

    What is the number of experiments being performed?

    <p>1</p> Signup and view all the answers

    What is the apparatus used to measure the melting point of a sample?

    <p>Digital m.p. measuring apparatus</p> Signup and view all the answers

    The sample height of 4-5 mm in the capillary tube is recommended for melting point determination.

    <p>False</p> Signup and view all the answers

    The compound being loaded into a capillary tube must be in a fully dried form.

    <p>True</p> Signup and view all the answers

    The Thiele apparatus is used to measure the melting point of a sample.

    <p>True</p> Signup and view all the answers

    The aim of the experiment is to determine the boiling point of an unknown sample.

    <p>False</p> Signup and view all the answers

    The capillary tube is attached to a thermometer by a rubber ring at the top of the thermometer's bulb.

    <p>False</p> Signup and view all the answers

    The oil bath is heated rapidly during the experiment.

    <p>False</p> Signup and view all the answers

    The number of experiments being performed is 2.

    <p>False</p> Signup and view all the answers

    The digital m.p. measuring apparatus is used to measure the melting point of a sample.

    <p>True</p> Signup and view all the answers

    The thermometer's bulb is placed above the surface of the oil bath during the experiment.

    <p>False</p> Signup and view all the answers

    The capillary tube is attached to a thermometer by a rubber ring during the experiment.

    <p>True</p> Signup and view all the answers

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