For which reaction is the unit of rate constant "K" the same as that of the reaction rate?
Correct answer: A. Zero order
- A. Zero order
- B. First order
- C. Second order
- D. Third order
Explanation
In a zero-order reaction, the rate of the reaction is independent of the concentration of the reactant. The rate law equation for a zero-order reaction is typically expressed as: Rate = k. In this equation, "k" is the rate constant. Since the rate of the reaction is not dependent on the concentration of the reactant, the unit of the rate constant "k" would not be the same as that of the reaction rate. The unit of the rate constant "k" for a zero-order reaction would depend on the specific units used for measuring the concentration and time. It is determined by the equation relating the units of the rate constant to the units of concentration and time in the rate law equation. Hence, option a is correct.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
Practise Chemical Equilibrium
625 free Chemical Equilibrium MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Chemical Equilibrium questions
The rate of reaction is defined as:
The rate law equation for a reaction is given as dx/dt= K[FeCl3][KI]2. The reaction is:
Consider the following reaction: 2FeCl3+6KI → 2Fe2+ + 6KCl+I2 Rate = [FeCl3]1[KI]1. Choose the correct molecularity and order of a reaction.
The unit of 1st order rate constant is:
Consider the following general reaction: IA+IB → products. Rate of this reaction is expressed as: Rate = K[A]1[B]1 The correct order of reaction and molecularity is:
For a certain chemical reaction, the slope of the plot was determined and plotted against the concentration (a-x)2 and a straight line was obtained. It indicates that the reaction is of: