题目内容

The conjugate base has one fewer H and one more ( ) charge than the acid.

A. negative
B. positive
C. neutral
D. zero

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Which of these expressions correctly expresses the solubility-product constant for Ag2CrO4 in water? ( )

A. [Ag+][CrO42-]
B. [Ag+]2[CrO42-]
C. [Ag+][CrO42-]2
D. [Ag+]2[CrO42-]2

Which solution is the buffer solution? ()

A. HCl
B. H2O
C. NH4Ac
D. HCN-NaCN

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