Multiple choice. Circle the letter corresponding to the best answer: Which syste

Question

Multiple choice. Circle the letter corresponding to the best answer: Which system would be the best choice for a buffer with a pH=4.0? HC_2CIH_2O_2 and its conjugate base HCHO_2 and its conjugate base HC_2H_3O_2 and its conjugate base HOCl and its conjugate base The titration curve shown at right is likely that of: A strong acid titrated by a strong base A weak acid titrated by a strong base A strong base titrated by a strong acid A weak base titrated by a strong acid Consider the titration of 50-mL of 0.10-M H_2SO_3 with 0.20-M KOH. When 25.0-mL of 0.20-M KOH added to the sulfurous acid solution, what will be the approximate pH? 1.8 4.5 7.2 none of the above Which of the following has a value of zero at 25 degree C? delta H_f degree for Ar (g) delta H_f degree for H_2O (l) S degree for Ar (g) S degree for H_2O(l) Which is correct for the exothermic reaction: CH_4(g) + 2 O_2(g) rightarrow CO_2 (g) + 2 H_2 O (l) The sign of delta H degree is positive and the sign of delta S degree is negative. The sign of delta H degree is negative and the sign of delta S degree is positive. The signs of delta H degree and delta S degree are both negative. The signs of delta H degree and delta S degree are both positive. If delta G degree is positive for a reaction, K > 1 and the reaction is spontaneous in the forward direction K 1 and the reaction is nonspontaneous in the forward direction K

Explanation / Answer

a) D

b)D

c)B

d)A

e)B

f)D

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