题目内容

Which process results in the increase in entropy of the universe? ( )

A. the cooling of a hot cup of coffee in room temperature air
B. the evaporation of water from a desk at room temperature
C. the melting of snow above 0 °C
D. all of the above

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Of the following, the amphoteric ion is ( )

A. HCO3-
B. CO32-
C. NH4+
D. ClO4-

1.56 mM equals to ( )? ( )

A. 1560 M
B. 1.56 x 103M
C. 1.56 x 10-3 M
D. 0.156 M

Which molecule has zero dipole moment? ( )

A. CH2Cl2
B. H2S
C. NH3
D. SO3

A decomposition reaction has a half-life that does not depend on the initial concentration of the reactant. What is the order of the reaction? ( )

A. zero order
B. first order
C. second order
D. Order cannot be determined without more information