【简答题】在 298 K 时,有 2 mol N 2 (设为理想气体),始态体积为 15 dm 3 ,保持温度不变,经下列三个过程到终态体积为 50 dm 3 ,计算各过程的 Δ U 、 Δ H 、 W 和 Q 的值。 (1) 自由膨胀; (2) 反抗恒定外压 100 kPa 膨胀; (3) 可逆膨胀。
【单选题】Shedoesthe______teachingjobsbutnothingpermanent.
【简答题】In some pilot programmes, teachers salaries are linked with students evaluation. If a teacher fails in the students evaluation, his or her salary will hurt. Some people applaud this new practice, thin...
【简答题】书P129-5 【 5 】在 298K 时,有 2molN 2 (g) ,始态体积为 15dm 3 ,保持温度不变,经下列三个过程膨胀到终态体积为 50dm 3 ,计算各过程的 ΔU , ΔH , W 和 Q 的值。设气体为理想气体。 ( 1 )自由膨胀; ( 2 )反抗恒外压 100kPa 膨胀; ( 3 )可逆膨胀。
【判断题】少根浮萍可直接用于乙醇和丙醇的发酵。()
【单选题】If there is an intruder _____the campus, students should be _____through an announcement, ______teachers should lock their classrooms to keep the children safe.
A.
in, warned, after that
B.
at, warned, before which
C.
on, informed, after which
D.
in, informed, before which