【简答题】化学反应HC 2 O 4 – (ag)+C 6 H 5 O – (ag) === C 2 O 4 2– (ag)+C 6 H 5 OH(ag) (1)计算反应在298.15 K时的ΔrG m Θ (298.15); (2)当反应物的浓度皆为0.01mol·L –1 ,生成物的浓度皆为0.1mol·L –1 时,反应向哪个方向进行? (已知H2C 2 O 4 K a2 Θ =6.4×10 –5...
【简答题】已知 K a1 Θ (H 2 C 2 O 4 ) = 5.9×10 - 2 , K a2 Θ (H 2 C 2 O 4 ) = 6.4×10 - 5 。将 30 mL 1.0 mol·L -1 H 2 C 2 O 4 溶液与 20 mL 1.0 mol·L -1 NaOH 溶液混合后,混合液的 pH = ___ 。
【多选题】Many people all over the world use their bodies as well as their voices to communicate. Two very common examples are the thumbs-up sign, to mean "OK", "fine" or "good" and the thumbs-down gesture to m...
A.
This is exemplified by thumbs-up sign, to mean "OK", "fine" or "good" and the thumbs-down gesture to mean the opposite.
B.
For example, thumbs-up sign means "OK", "fine" or "good" and the thumbs-down gesture has the opposite meaning.
C.
Thumbs-up to mean "OK", "fine" or "good" and the thumbs-down gesture to mean the opposite.
D.
I would like to illustrate the point with the examples of thumbs-up sign, to mean "OK", "fine" or "good" and the thumbs-down gesture to mean the opposite.