工业上制备纯硅反应的热化学方程式如下:SiCl4(g)+2H2(g) Si(s)+4HCl(g);△H=+QkJ·mol-1(Q>0),某温度、压强下,将一定量的反应物通入密闭容器进行以上的反应(此条件下为可逆反应),下列叙述正确的是( )
A.反应过程中,若增大压强能提高SiCl4的转化率 |
B.若反应开始时SiCl4为1mol,则达到平衡时,吸收热量为QkJ |
C.反应至4min时,若HCl的浓度为0.12mol·L-1,则H2的反应速率为0.03mol/(L·min) |
D.当反应吸收热量为0.025QkJ时,生成的HCl通入100mL1mol·L-1的NaOH恰好反应 |
—— 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 |
They use computers to keep the traffic _______ smoothly.
A.being run | B.run | C.to run | D.running |
If you leave the club, you will not be_____back in .
A.received | B.admitted | C.turned | D.moved |