|
1) What is denoted by the subscript 'c' in Kc? a. chemical equilibrium b. chemical reaction c. molar concentration at equilibrium d. rate of chemical reaction
|
||||
|
2) What percentage of ammonia is produced at equilibrium by the Haber process? a. 20 percent b. 33 percent c. 100 percent d. 99 percent
|
||||
|
3) In Haber's process, the amount of ammonia yields is a. 0.4 b. 0.9 c. 0.33 d. 0.22
|
||||
|
4) What is established when the rate of evaporation equals the rate of condensation? a. equality b. equilibrium c. reversible reaction d. irreversible reaction
|
||||
|
5) The rate at which a substance reacts is directly proportional to its a. product b. active mass c. reactant d. catalysts
|
||||
|
6) The reactions in which reactants react to form products and simultaneously products reverse back into reactants are called a. reversible reactions b. irreversible reaction c. spontaneous reactions d. non spontaneous reactions
|
||||
|
7) The equilibrium constant can be used to a. predict direction of chemical reaction b. predict extent of chemical reaction c. determine the equilibrium concentration of mixture d. all of above
|
||||
|
8) The process by which ammonia is produced by the reaction of nitrogen with hydrogen at 200 atm pressure and in the presence of a catalyst is called a. contact process b. recovery of ammonia c. calcination d. Haber process
|
||||
|
9) If a change is imposed in concentration, temperature or pressure on a chemical system at equilibrium, the system responds in a way that the change is a. not opposed b. opposed c. rapidly increased d. slowly increased
|
||||
|
10) Which of the following statements about catalysts is not true? a. they speed up a chemical reaction b. they reduce the time taken to reach equilibrium c. they have effect on the position of equilibrium once it is reached d. they have no effect on the position of equilibrium one it is reached
|
||||
