Chem 2 final multiple choice questions

A buffer 0.100M NH4Br and 0.100M NH3. When a small amount of hydrochloric acid is added to this buffer, which buffer component neutralizes the added acid?

• NH4+

• NH3

• Br-

• None of the above(hydrochloric acid will not be neutralized by this buffer)

The effectiveness of a buffer depends on which of the following factors?

• the relative amounts of acid and base

• the value of Kw for the buffer system

• the absolute concentration of the acid and base

• all of the above

• The relative amounts and absolute concentration

A buffer solution is made by mixing a solution of

• a weak acid and its conjugate base

• a strong base and its conjugate acid

• a weak base and its conjugate base

• a strong acid and its conjugate base

Two separate 20.0 mL acid samples - 0.10 M HA (a weak acid) and 0.10 M HX (a strong acid) - are both titrated with 0.10 M NaOH. Which statement below is true of both titrations?

• Both titrations have the same initial pH

• Both titrations have the same pH at the equivalence point

• Both titrations have the same final pH

• Both titrations require that same volume of NaOH to reach the equivalence point

How would the molar solubility of solid silver chloride change if it were dissolved in a solution of sodium chloride as compared to dissolving in pure water?

• the molar solubility would be higher

• The molar solubility would be lower

• The molar solubility would not change

• Can not be determined

Kinetics is

• the study of the factors that affect the speed of a reaction

• the study of the mechanism by which a reaction proceeds

• the study of monitoring chemical reactions

• the study of factors and the study of the mechanism

• all of the above

What are factors that influence the rate of a chemical reaction

• nature of the reactant

• temperature

• cancentration

• catalyst

• All of the above

A reaction is which A, B, and C react to form products is first order in A, second order in B, and zero order in C. By what factor does the reaction change in the concentration of B is doubled?

• Rate stays the same

• Rate doubles

• Rate quadruples

• Cannot be determined

How does a high energy of activation for a given chemical reaction affect the rate of the chemical reation?

• The rate is slow

• The rate is fast

• The rate is very fast

• The rate stays the same

If the reaction of 2 BrNO(g) <-> 2 NO(g) + Br2(g) is at equilibrium and BrNO is added, how will the system respond?

• Shift left

• Shift right

• No shift

• None of the above