IB Chemistry SL 1.1.3 Temperature and Kinetic Energy

Practise treating absolute temperature as a measure of average particle kinetic energy. Convert accurately between Celsius and kelvin, compare kinetic energy when temperature…

Syllabus
First assessment 2025
Objective
1.1.3
Level
SL

Exam points

  • convert Celsius values to kelvin with the precision required by a data table
  • predict the factor change in average kinetic energy when absolute temperature changes
  • interpret a temperature or energy graph across heating and changes of physical state

1.1.3—Temperature and kinetic energy question 1

[Maximum number: 1]

Nitrogen dioxide, NO2\mathrm{NO}_{2}, is a brown, toxic and corrosive gas. It can be made in a school laboratory by heating a group II metal nitrate or by the reaction of copper, Cu , with concentrated nitric acid, HNO3\mathrm{HNO}_{3}.

The initial amount of NO2\mathrm{NO}_{2} was determined by titration. The oxide was first dissolved in water according to the following equation:

2NO2( g)+H2O(l)→HNO3(aq)+HNO2(aq)2 \mathrm{NO}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{HNO}_{3}(\mathrm{aq})+\mathrm{HNO}_{2}(\mathrm{aq})

The solution was made up to 250.0 cm3250.0 \mathrm{~cm}^{3} and 25.0 cm325.0 \mathrm{~cm}^{3} portions of this solution were then titrated against a 0.0500 moldm−30.0500 \mathrm{~mol} \mathrm{dm}^{-3} standard solution of sodium hydroxide, NaOH .

Calculate the values for temperature, T , in degrees kelvin, K , and complete the table.

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