Chemical Kinetics and Reaction Rates - Case Studies

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Q. For a reaction at equilibrium, if the concentration of products is increased, what will happen to the position of equilibrium according to Le Chatelier's principle?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Depends on temperature
Q. For a zero-order reaction, what is the relationship between the concentration of reactant and time?
  • A. Concentration decreases linearly with time
  • B. Concentration decreases exponentially with time
  • C. Concentration remains constant
  • D. Concentration increases with time
Q. If the half-life of a first-order reaction is 10 minutes, what is the rate constant k?
  • A. 0.0693 min^-1
  • B. 0.1 min^-1
  • C. 0.693 min^-1
  • D. 0.5 min^-1
Q. In a reaction at equilibrium, what happens to the rate of the forward and reverse reactions?
  • A. Forward rate is greater
  • B. Reverse rate is greater
  • C. Both rates are equal
  • D. Rates are not related
Q. In a reaction mechanism, if the slow step is the rate-determining step, how does it affect the overall reaction rate?
  • A. It has no effect
  • B. It increases the rate
  • C. It decreases the rate
  • D. It determines the rate
Q. In a reaction where the rate constant doubles with a 10°C increase in temperature, what is the approximate activation energy (Ea) if R = 8.314 J/(mol·K)?
  • A. 40 kJ/mol
  • B. 80 kJ/mol
  • C. 120 kJ/mol
  • D. 160 kJ/mol
Q. In a reaction where the rate is dependent on the concentration of two reactants, what is the term for the concentration of reactants at which the reaction rate is half of its maximum?
  • A. Equilibrium concentration
  • B. Half-life concentration
  • C. Saturation concentration
  • D. Threshold concentration
Q. In a reaction with a rate constant k, if the concentration of reactant A is doubled, how does the rate change if the reaction is second order with respect to A?
  • A. Rate remains the same
  • B. Rate doubles
  • C. Rate quadruples
  • D. Rate increases by a factor of eight
Q. In a zero-order reaction, how does the concentration of the reactant change over time?
  • A. Linearly with time
  • B. Exponentially with time
  • C. Inversely with time
  • D. Remains constant
Q. What happens to the reaction rate if the temperature is increased by 20°C for most reactions?
  • A. Rate doubles
  • B. Rate quadruples
  • C. Rate decreases
  • D. Rate remains the same
Q. What is the primary reason for the increase in reaction rate with increasing temperature?
  • A. Increased concentration of reactants
  • B. Increased kinetic energy of molecules
  • C. Decreased activation energy
  • D. Increased surface area
Q. What is the unit of the rate constant k for a first-order reaction?
  • A. mol/L·s
  • B. s^-1
  • C. mol/L
  • D. L^2/(mol·s)
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