Tetrachloromethane, CCl4, is a（）
A. polar molecule with polar bonds
B. polar molecule with non-polar bonds
C. non-polar molecule with polar bonds
D. non-polar molecule with non-polar bonds
查看答案
There were___ for Saturday’s movie（）
A. not available tickets
B. no available
C. no tickets available
D. tickets no available
Which statement about ethanol is correct（）
AIt burns in air to form ethene and water
BIt is prepared from ethene by fermentation
CIt is prepared from glucose in an addition reaction
DIt is the only product when ethene reacts with steam
Which statement about alkenes is not correct（）
A They are hydrocarbons
B They are saturated
C They contain a C=C bond
D They form polymers
Suggest the shape of the phosphine molecule, PH3（）
A. Trigonal planar
B. Trigonal pyramidal
C. Trigonal bipyramidal
D. Octahedral
微信支付 
支付宝支付