Rate Law Expression Worksheet
This worksheet covers the basics of rate law expressions, including determining reaction order and writing rate laws from experimental data for Grade 9 Science students.
Includes
Standards
Topics
Rate Law Expression Worksheet
Name:
Date:
Score:
Read each question carefully and provide your answers in the spaces provided. Show all your work for calculations.
The rate law (or rate equation) expresses the relationship of the rate of a reaction to the rate constant and the concentrations of the reactants raised to some powers. For a general reaction: aA + bB → cC + dD, the rate law is typically written as Rate = k[A]^x[B]^y, where k is the rate constant, [A] and [B] are the concentrations of reactants, and x and y are the orders of the reaction with respect to reactants A and B, respectively.
1. The expresses the relationship between the rate of a reaction and the concentrations of reactants.
2. In the rate law, 'k' represents the .
3. The exponents in a rate law are called the with respect to each reactant.
1. What is the overall reaction order if the rate law is Rate = k[A]^2[B]^1?
1
2
3
4
2. If doubling the concentration of reactant A doubles the reaction rate, what is the order of reaction with respect to A?
Zero order
First order
Second order
Third order
1. For the reaction 2NO(g) + O2(g) → 2NO2(g), the following initial rate data were collected at 25°C:
Experiment | [NO] (M) | [O2] (M) | Initial Rate (M/s) ------------------------------------------------------------------ 1 | 0.010 | 0.010 | 2.5 x 10^-5 2 | 0.020 | 0.010 | 1.0 x 10^-4 3 | 0.010 | 0.020 | 5.0 x 10^-5
Determine the rate law for this reaction.
2. Explain the difference between reaction order and molecularity.
1. The order of a reaction can only be determined experimentally, not from the stoichiometry of the balanced equation.
True
False
2. A zero-order reaction means that the rate of reaction is independent of the concentration of the reactant.
True
False