Choose the wrong characterization of surface tension ()
A. Unbalanced forces
B. Resists being broken
C. Tends to be drawn outward
D. At the very surface
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Choose the ionic crystals ()
A. diamond
B. NaCl
C. Ice
D. SiC
Choose the right name of 丙醛 and 环己酮 ()
A. Propanone and Cyclohexanal
B. Propanol and Cyclohexene
C. Propanal and Cyclohexanone
D. Propane and Cyclohexane
Choose the negative oxidation number ()
An element has lost electrons
B. An element is sharing electron with a less electronegative element
C. Free element
D. Cation
Choose the right characterizations of benzene () ①aliphatic ②C to C bond distances were identical ③aromatic ④delocalized unhybridized p orbital
A. ③④
B. ①②③
C. ①③
D. ②③④
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