40 Questions
What is the primary factor that affects the physical properties of a compound?
The type of bonds holding the atoms together
What is the phase of matter that is typically not encountered in an organic chemistry laboratory?
Plasma
What occurs when the environment around a material is changed, such as by varying the temperature or pressure?
The material undergoes a phase transition
What type of bond is formed by the transfer of electrons?
Ionic bond
What is the type of intermolecular force that occurs between an ion and a polar molecule?
Ion-dipole
What is the physical property of a compound that is affected by its molecular structure?
All of the above
What is the change from one state of matter into another called?
Phase transition
What is the difference between T1 and T2 called?
Melting Point Range
What is the typical melting point range for a pure sample?
0.5-1 °C
What is the purpose of determining the melting point of an organic compound?
To identify the compound and determine its purity
What is the result if the mixed melting point is lower than the original melting point and has a wider range?
The two samples are different
What is the purpose of gently pressing the open end of the capillary tube into the powdered sample?
To fill the tube with the sample
What is the formula of sodium acetate?
CH₃COONa
What is the technique used to determine the melting point of an organic compound?
Capillary tube method
What type of intermolecular force is responsible for the attraction between polar molecules and nonpolar molecules?
Dipole - induce dipole
What is the common name for induce dipole - induce dipole forces?
London dispersion forces
What is the minimum requirement for hydrogen bonding to occur?
Both electronegative atoms must be from the group: F, O, N
What is the temperature at which the solid and the liquid phase of a compound are in equilibrium at 1 atmosphere?
Melting point
What is the range between the temperatures at which the solid begins to change into liquid and becomes completely liquid?
Melting point range
What is the force responsible for the attraction between two nonpolar molecules?
Induce dipole - induce dipole
What is the purpose of determining the melting point of a substance?
To determine the identity of the substance
What is the recommended height of the sample in a capillary tube for determining melting point?
2-3 mm
What is the condition of a compound being loaded into a capillary tube?
In a powdered form
What is the purpose of attaching the capillary tube to a thermometer?
To measure the melting point of the sample
What is the purpose of heating the oil bath gradually?
To prevent sudden changes in the sample's temperature
What is the purpose of the rubber ring in the experiment?
To attach the capillary tube to the thermometer
What is the purpose of the oil bath in the experiment?
To heat the sample
What is the aim of the experiment?
To identify an unknown compound using its melting point
What is the number of experiments being performed?
1
What is the apparatus used to measure the melting point of a sample?
Digital m.p. measuring apparatus
The sample height of 4-5 mm in the capillary tube is recommended for melting point determination.
False
The compound being loaded into a capillary tube must be in a fully dried form.
True
The Thiele apparatus is used to measure the melting point of a sample.
True
The aim of the experiment is to determine the boiling point of an unknown sample.
False
The capillary tube is attached to a thermometer by a rubber ring at the top of the thermometer's bulb.
False
The oil bath is heated rapidly during the experiment.
False
The number of experiments being performed is 2.
False
The digital m.p. measuring apparatus is used to measure the melting point of a sample.
True
The thermometer's bulb is placed above the surface of the oil bath during the experiment.
False
The capillary tube is attached to a thermometer by a rubber ring during the experiment.
True
Test your understanding of physical properties of organic compounds, including melting point, boiling point, and more. Learn how molecular structure affects these properties.
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