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【简答题】
Dinitrogen pentaoxide, N 2 O 5 , is the anhydride of nitric acid. It is not very stable, and in the gas phase or in solution with a nonaqueous solvent it decomposes by a first-order reaction into N 2 O 4 and O 2 . The rate equation is v=kc(N 2 O 5 ) At 45℃, the rate constant for the reaction in carbon tetrachloride is 6.22×10 -4 s -1 . Ifthe initial concentration of the N 2 O 5 in the solution is 0.100mol·dm -3 , how many minuteswill it take for the concentration to drop to 0.0100 mol·dm -3 ?
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举一反三
【简答题】Once a topic is chosen, it is suggested that students that students work together to ______ for writing.
【多选题】Once students have a speech topic, they should be creative in developing it by which ways?
A.
They can think of ways to make the speech mysterious or suspenseful.
B.
They can talk about dangerous situation, adventure, or drama.
C.
They can use colorful, descriptive language.
D.
They can use humor as long as it is I good taste and grows naturally out of the speech content.
【简答题】单位内部会计监督可通过（ ）在处理会计业务过程中进行。
【单选题】Once you have a topic for your speech, be __________ in developing it.
A.
thoughtful
B.
creative
C.
ethical
D.
critical
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