Choose the right name of 盐酸 and 硫酸 ()
A. Hydrochloric acid and hydrogen sulfate
B. Hydrogen chloride and hydrogen sulfate
C. Hydrochloric acid and sulfuric acid
D. Hydrogen chloride and sulfuric acid
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Choose the right name of 乙烷 and 丁炔 ()
A. Ethane and butyne
B. Ethane and butayne
C. Ethene and butyne
D. Ethane and butane
Choose the right description ()
A. The positions in ionic crystals are occupied by molecules.
B. The carbonyl double bond is polar bond.
C. The oxidation number of an atom of any free element is zero.
D. Nitrogen gas is used in lighter than air balloons.
Viscosity increases with the increase of () ①:Intermolecular attraction ②:Temperature ③:Height ④:Density of liquid
A. ①④
B. ②③
C. ①③
D. ②④
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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