Chem 2 exam outline

Question 1

Factors Affecting the Rate of a Reaction. (Changes in Temperature and Concentration)

Answer 1

An increase in temperature increases the rate of reaction, as temp increases a greater fraction of molecules have enough thermal energy to surmount the activation barrier
Concentration= reactant concentration decreases with time, product concentration increases with time
n=0 is zero order, rate is independent of the concentration of A
n=1 is first order, rate is directily proportional to the concentration of A
n=2 second order, rate is proportional to the square of the concentration of A

Question 2

Effect of Changes in Pressure on Gas Solubility

Answer 2

If the pressure increases, the solubility of the ionic compound not affected
if pressure increases solubility of gases increases

Question 3

Effect of Temperature on the Solubility of Ionic Compounds

Answer 3

If temp increases solubility of ionic compound increases
if temp increase solubility of gases decrease

Question 4

Determine whether a solution is unsaturated, saturated, or supersaturated using the Solubility vs. Temperature graph

Answer 4

unsaturated= solution containing less than the equilibrium amount of solute, if you add additional solute it will dissolve
saturated= solution that dissolved solute is in the dynamic equilibrium with the solid solute, if you add additional solute it will not dissolve
supersaturated= containing more than the equilibrium amount of solute,

See solubility and temp graph figure 14.11 page 591

Question 5

Write the reaction rate expressions for a reaction

Answer 5

rate of reaction= change in amount of reactants divided by change in time
rate expression example: H2 + I2 —> 2 HI
Rate expression see notes chapter 15, 2/7 practice problems