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VICChemistryQuick questions

Unit 3: How can design and innovation help to optimise chemical processes?

Quick questions on Dynamic equilibrium, Kc and Le Chatelier's principle: VCE Chemistry Unit 3

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is dynamic equilibrium?
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A reaction is at dynamic equilibrium when:
What is le Chatelier's principle?
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Le Chatelier's principle: if a system at equilibrium is disturbed, it shifts to partially counteract the disturbance and restore equilibrium.
What is q1?
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State Le Chatelier's principle and use it to predict the effect of increasing temperature on the equilibrium N2O4β‡Œ2NO2\text{N}_2 \text{O}_4 \rightleftharpoons 2 \text{NO}_2, Ξ”H=+58 kJ/mol\Delta H = +58 \, \text{kJ/mol}. [3 marks]
What is q2?
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For H2+I2β‡Œ2HI\text{H}_2 + \text{I}_2 \rightleftharpoons 2 \text{HI}, at equilibrium [H2]=0.20[\text{H}_2] = 0.20, [I2]=0.10[\text{I}_2] = 0.10, [HI]=0.50 mol/L[\text{HI}] = 0.50 \, \text{mol/L}. (a) Calculate KcK_c. (b) If 0.20 mol/L0.20 \, \text{mol/L} HI is added, predict the direction of shift.
What is q3?
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For the Haber process N2+3H2β‡Œ2NH3\text{N}_2 + 3 \text{H}_2 \rightleftharpoons 2 \text{NH}_3, Ξ”H=βˆ’92 kJ/mol\Delta H = -92 \, \text{kJ/mol}. (a) Predict the effect of increased pressure on yield. (b) Predict the effect of higher temperature.

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