题目内容

Which molecule has zero dipole moment? ( )

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

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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

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Which statement is true regarding the function of a catalyst in a chemical reaction? ( )

A catalyst increases the rate of a reaction.
B. A catalyst provides an alternate mechanism for the reaction.
C. A catalyst is not consumed by the reaction.
D. All of the above are true.

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Which gas sample has the greatest volume at STP? ( )

A. 10.0 g Ar
B. 10.0 g Kr
C. 10.0 g Xe
D. None of the above (They all have the same volume.)

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A chemical system produces 155 kJ of heat and does 22 kJ of work. What is ∆E for the surroundings? ( )

A. 177 kJ
B. -177 kJ
C. 133 kJ
D. -133 kJ

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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? ( )

Which statement is true regarding the function of a catalyst in a chemical reaction? ( )

Which gas sample has the greatest volume at STP? ( )

A chemical system produces 155 kJ of heat and does 22 kJ of work. What is ∆E for the surroundings? ( )

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