Which solution is the buffer solution? ()
A. HCl
B. H2O
C. NH4Ac
D. HCN-NaCN
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Which one is extensive property? ( )
A. bp
B. density
C. color
D. mass
For a close system, which of the following statement is correct? ( )
A. matter can exchange
B. energy can exchange
C. energy cannot exchange
D. nothing can exchange
The formula of the first law of thermodynamics is ( ).
A. ∆U=Q-W
B. ∆U=W-Q
C. ∆U=Q+W
D. ∆Q=U+W
Please find the wrong statement as below. ( )
A. Vapor pressure lowering is one of colligative properties of diluted solution
Boiling point will elevate because of vapor pressure lowering
C. The vapor pressures of all liquid depend on the given temperature
D. Freezing point will elevate because of vapor pressure lowering
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