Lesson Worksheet: Orders of Reaction Chemistry • 10th Grade

In this worksheet, we will practice using a rate law to deduce the order of reaction for each reactant.


Elements in the reactivity series are placed in order of increasing reactivity, as shown in the figure. Which property is used to determine the relative reactivities of elements in the reactivity series?

  • AThe vigorousness with which the elements react with halogens and halide salts
  • BThe number of electrons added to atoms of the elements when they are converted to anions
  • CThe solubility of the elements in water and acid
  • DThe vigorousness with which the elements react with water and acid
  • EThe number of electrons removed from atoms of the elements when they are converted to cations


Iodide ions can be oxidized in solution by hypochlorite ions (ClO): I()+ClO()IO()+Cl()aqaqaqaq The rate of reaction of iodide ions was measured at three different reactant concentrations, as shown in the table.

[I](mM)[ClO](mM)Rate (L⋅mM/s)

By plotting suitable functions of the tabulated data, determine the appropriate unit for the rate constant of this reaction.

  • AL/mmol⋅s
  • BL2/mmol2⋅s
  • Cs−1
  • DmM/s
  • EmMs/

Expressing concentrations in units of millimolars and times in units of seconds, estimate, to 2 significant figures, the numerical value of the rate constant for this reaction.

  • A6.1×10
  • B1.2×10
  • C3.1×10
  • D4.1×10
  • E1.8×10

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