Explain why the vapor pressure of a solution made with a nonvolatile solution must be less than
the vapor pressure of the pure solvent?
Solution
Escaping of solvent molecules from the surface of liquid to space is called vaporization. The
vapors are then condensed. When there is an equilibrium between vaporization and
condensation, the pressure exerted by the vapors of the liquid over the liquid is called vapor
pressure.
In a pure liquid, the entire surface is occupied by the molecules of the liquid whereas in the case
of solution, the surface is occupied by the liquid molecuels and nonvolatile solute molecules. So,
the number of solvent molecules escaping from the surface is reduced compare to the pure
solvent, thus, the vapor pressure of solution is reduced.
Hence, the vapor pressure of a solution of nonvolatile solution is less than the vapor pressure of
the pure solvent..
factors that are significant in the development of disease includ.pdf
1. factors that are significant in the development of disease include the:
A.portal of entry
B. Agents of transmission
C. Virulence of microorganism
D. Receptor sites
E. All of the above
factors that are significant in the development of disease include the:
A.portal of entry
B. Agents of transmission
C. Virulence of microorganism
D. Receptor sites
E. All of the above
A.portal of entry
B. Agents of transmission
C. Virulence of microorganism
D. Receptor sites
E. All of the above
Solution
A portal of entry is the site through which micro-organisms enter the susceptible host and cause
disease/infection.
infectious diseases are transmitted from person to person by direct or indirect contact. Certain
types of viruses, bacteria, parasites, and fungi can all cause infectious disease
In most other contexts, especially in animal systems,virulence refers to the degree of damage
caused by a microbe to its host. The pathogenicity of an organism - its ability to cause disease -
is determined by its virulence factors.
receptor sites are actually proteins that are on the surface of each cell. They act as little receivers
(or ears) that listen to the messages of the chemical messenger molecules as they float in the
intercellular fluid surrounding every cell, which also cause development of disease.
Thus the answer is E. all the above.
