A:put out
B:leave out
C:point out
D:pick out
Swimming club
Do you like to swim? Do you want to swim well? Then we have good teachers to teach you. Opening time:2: 00 p.m ~ 9: 30 p.m
Ticket price: 15 yuan for children, 20 yuan for adults(成人)
Please call Mr. Wang at 877-778
Children dancing club
We are a dancing club for children of 5~14. we have lessons from 9:00 to 10: 30 every Saturday and Sunday.
If you like dancing, just join us.
Call Miss Wu at 263-566
Ⅰ.实验室制取CH3Cl的原理是CH3OH+HCl(浓) →△ZnCl2 CH3Cl+H2O.具体步骤如下:
①干燥ZnCl2晶体;
②称取24g研细的无水ZnCl2和量取20mL浓盐酸放入圆底烧瓶,同时量取一定量的甲醇放入分液漏斗中;
③将分液漏斗里的甲醇逐滴滴入烧瓶中并加热,待ZnCl2完全溶解后有CH3Cl气体逸出,可用排水法收集.
请回答:
煤气中添加少量有特殊臭味的乙硫醇(C2H5SH),可以提醒人们预防煤气泄露。乙硫醇在煤气燃烧过程中也可充分燃烧,其反应方程式为2C2H5SH + 9O2 点燃 4CO2 + 2X + 6H2O, 则 X 的化学式为: ( )