题目内容

Determine the molecular geometry of XeF4. ( )

A. tetrahedral
B. trigonal bipyramidal
C. T-shaped
D. seesaw

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If the plot of the reactant concentration versus time is nonlinear, but the concentration drops by 50% every 10 seconds, then the order of the reaction is ( )

A. zero order
B. first order
C. second order
D. third order

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If the plot of the reactant concentration versus time is linear, then the order of the reaction is ( )

A. zero order
B. first order
C. second order
D. third order

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Find the pH of 0.175 M NaCN solution. For HCN, Ka = 4.9 × 10-10. ( )

A. 5.03
B. 11.28
C. 2.31
D. 8.97

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For a process to occur spontaneously, ( )

A. the entropy of the system must increase
B. the entropy of the surroundings must increase
C. both the entropy of the system and the entropy of the surroundings must increase
D. the net change in entropy of the system and surroundings considered together must be a positive quantity

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Determine the molecular geometry of XeF4. ( )

A. tetrahedral B. trigonal bipyramidal C. T-shaped D. seesaw

If the plot of the reactant concentration versus time is nonlinear, but the concentration drops by 50% every 10 seconds, then the order of the reaction is ( )

If the plot of the reactant concentration versus time is linear, then the order of the reaction is ( )

Find the pH of 0.175 M NaCN solution. For HCN, Ka = 4.9 × 10-10. ( )

For a process to occur spontaneously, ( )

A. tetrahedral
B. trigonal bipyramidal
C. T-shaped
D. seesaw