Chapter 17: Q95AE (page 733)
The destruction of a colloid is done through a process called coagulation. What is coagulation?
Coagulation is an aggregation of smaller suspended particles into larger aggregates that settles out of solution.
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Using the phase diagram for water and Raoultโs law, explain why salt is spread on the roads in winter (even when the temperature is below freezing).
Liquid A has vapor pressure x, and liquid B has vapor pressure y. What is the mole fraction of the liquid mixture if the vapor above the solution is 30. % A by moles? 50% A? 80% A? (Calculate in terms of xand y.) What is the mole fraction of the vapor above the solution if the liquid mixture is 30. % A by moles? 50.% A? 80.% A? (Calculate in terms of xand y.)
Structure, pressure, temperature all have an effect on solubility. Discuss each of their effects. What is henryโs law? Why does henry law does not work for HCl? What do the terms hydrophobic and hydrophilic mean?
Using KF as an example, write equations that refer to and Lattice energy was defined in chapter 13 as the reaction. K+(g)+F-(g) โKF(s). Show how would you utilize Hessโs law to calculate from and for KF, where = lattice energy,for KF, as for other soluble ionic compounds, is a relatively small number. How can this be sinceandare relatively large negative numbers?
The following plot shows the vapor pressure of various solutions of components A and B at some temperatures.
Which of the following statements is false concerning solutions of A and B?
a. The solutions exhibit negative deviations from Raoultโs law.
b. for the solutions should be exothermic.
c. The intermolecular forces are stronger in solution than in either pure A or pure B.
d. Pure liquid B is more volatile than pure liquid A.
e. The solution with will have a lower boiling point than either pure A or pure B.
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