A sealed 2.0 L glass flask contains the equilibrium system \$\(\mathrm{N_2O_4(g) \rightleftharpoons 2NO_2(g)}\)\$ at a constant temperature of 298 K. At equilibrium the gas mixture is a uniform light brown colour.
A student performs the following sequence without opening the flask:
The student observes colour changes after each step and that the colour eventually becomes constant again after some time.
For Step 3, the student adds argon at constant volume and constant temperature. Predict whether the equilibrium position changes and whether any colour change is expected. Explain your reasoning using collision theory and partial pressures.
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Create Free Account Log inThis is a free HSC HSC Chemistry practice question worth 4 marks, testing your understanding of Explain the overall observations about equilibrium. It falls under Factors that Affect Equilibrium in Module 5: Module 5: Equilibrium and Acid Reactions. Submit your answer above to receive instant AI-powered marking and personalised feedback.
Chemical systems may be open or closed. They include physical changes and chemical reactions that can result in observable changes to a system. Students study the effects of changes in temperature, concentration of chemicals and pressure on equilibrium systems, and consider that these can be predicted by applying Le Chatelier’s principle. Students also analyse the quantitative relationship between products and reactants in equilibrium reactions to determine an equilibrium constant. From this calculation, they predict the equilibrium position, either favouring the formation of products or reactants in a chemical reaction. This module also allows students to understand that scientific knowledge enables scientists to offer valid explanations and make reliable predictions. Students make reliable predictions by comparing equilibrium calculations and equilibrium constants to determine whether a combination of two solutions will result in the formation of a precipitate.
Inquiry question: What factors affect equilibrium and how?
explain the overall observations about equilibrium in terms of the collision theory (ACSCH094)
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