白磷和红磷与氧气反应过程与能量变化如图，E表示能量，下列正确的是
| A．白磷比红磷稳定 |
| B．白磷燃烧是吸热反应 |
| C．红磷转变为白磷是吸热反应 |
| D．红磷燃烧的热化学方程式： 4P(s）+ 5O2(g）=P4O10(s）ΔH =(E2－E3)kJ/mol |
相关试题
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |
粤公网安备 44130202000953号