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QLDChemistryQuick questions

Unit 3: Equilibrium, acids and redox reactions

Quick questions on Le Chatelier's principle and equilibrium shifts (QCE 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 are temperature changes?
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Temperature is the only disturbance that actually changes Kc. Whether the equilibrium shifts forward or back depends on the thermicity of the forward reaction.
What are catalysts?
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A catalyst speeds the forward and reverse reactions equally. The equilibrium position does not shift and Kc does not change. The system reaches equilibrium faster.
What is q1?
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State Le Chatelier's principle. Predict and justify the effect of (a) increasing T\text{T} and (b) increasing pressure on N2+3H2β‡Œ2NH3\text{N}_2 + 3 \text{H}_2 \rightleftharpoons 2 \text{NH}_3, Ξ”H<0\Delta H < 0. [4 marks]
What is q2?
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Adding Ag+\text{Ag}^+ to a saturated AgCl(s)β‡ŒAg++Clβˆ’\text{AgCl}(s) \rightleftharpoons \text{Ag}^+ + \text{Cl}^- solution: predict observation and justify with KspK_{sp}. [3 marks]
What is q3?
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CoCl42βˆ’(blue)+6H2Oβ‡ŒCo(H2O)62+(pink)+4Clβˆ’\text{CoCl}_4^{2-}(\text{blue}) + 6 \text{H}_2 \text{O} \rightleftharpoons \text{Co(H}_2 \text{O})_6^{2+}(\text{pink}) + 4 \text{Cl}^-, Ξ”H>0\Delta H > 0 forward. (a) Predict observation on heating. (b) Predict observation on adding AgNO3\text{AgNO}_3.

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