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A.To give an example of a bad reaction to penicillin
B.To show how penicillin has changed over the years
C.To emphasize the importance of antibiotics
D.To explain why penicillin requires a prescription
Mr Brown's reaction to the questions he has to answer is
A.completely indifferent.
B.fairly relaxed.
C.quite annoyed.
D.rather impatient.
The reaction 2NO2→2NO+O2has an activation energy of 111 kJ·mol-1. At400℃,k=7.8dm3·mol-1·s-1. What is the value of k at 430℃?
What is the reaction of the government?
A.It has heavily condemned the air traffic controllers.
B.It might allow the military to take control of the airspace.
C.It will encourage people not to go out.
D.Not mentioned.
A.extreme
B.extremes
C.phenomenon
D.reaction
A.It reflects the audience reaction to their programs.
B.It has some close connection with the price for advertising time.
C.It keeps a record of what the audience have watched.
D.It helps to improve the quality of the programs.
The decomposition of HI has rate constants k=0.079dm3·mol-1·s-1at 508℃and k=0.24dm3·mol-1·s-1at 540℃. What is the activation energy of the reaction inkJ·mol-1?
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