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QLDChemistryQuick questions
Unit 3: Equilibrium, acids and redox reactions
Quick questions on Dynamic equilibrium and closed systems (QCE Chemistry Unit 3)
4short 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 reversible reactions?Show answer
Some reactions go essentially to completion (combustion of hydrocarbons in excess oxygen). Others are reversible: products can recombine to reform reactants. Reversible reactions are written with a double arrow.
What is q1?Show answer
State the two macroscopic and two microscopic criteria of dynamic equilibrium. [4 marks]
What is q2?Show answer
is sealed in a flask. Sketch (describe) graphs of (a) concentration vs time and (b) forward and reverse rates vs time. [3 marks]
What is q3?Show answer
Explain why an open beaker of saturated NaCl solution is not at chemical equilibrium even though no solid dissolves further. (a) Distinguish closed vs open. (b) Identify the missing condition.
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