First-order integrated rate law
A first-order reaction in a Melbourne HL thermochemistry lesson has \([A]_0=0.80\,\text{mol dm}^{-3}\), \(k=0.28\,\text{min}^{-1}\), and \(t=7\,\text{min}\). Calculate \([A]_t\). Enter the answer and choose the interpretation that matches the HL chemistry evidence.
Worked practice: chemistry evidence and answer
Use the chemical evidence first, then enter the result and interpretation that match it.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.