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What is the rate law expression for a reaction that is first order with respect

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Question: What is the rate law expression for a reaction that is first order with respect to reactant A? (2022)

Options:

  1. Rate = k[A]
  2. Rate = k[A]^2
  3. Rate = k[A]^0
  4. Rate = k[A]^[1/2]

Correct Answer: Rate = k[A]

Exam Year: 2022

Solution: 

For a first order reaction, the rate law is directly proportional to the concentration of the reactant, hence Rate = k[A].

What is the rate law expression for a reaction that is first order with respect

Practice Questions

Q1
What is the rate law expression for a reaction that is first order with respect to reactant A? (2022)
  1. Rate = k[A]
  2. Rate = k[A]^2
  3. Rate = k[A]^0
  4. Rate = k[A]^[1/2]

Questions & Step-by-Step Solutions

What is the rate law expression for a reaction that is first order with respect to reactant A? (2022)
  • Step 1: Understand that a first order reaction means the rate of the reaction depends on the concentration of one reactant.
  • Step 2: Identify the reactant in this case, which is A.
  • Step 3: Write the rate law expression, which states that the rate is proportional to the concentration of A.
  • Step 4: Use the symbol 'k' to represent the rate constant in the expression.
  • Step 5: Combine these elements to form the rate law: Rate = k[A].
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