Charge difference for electron balancing
A half-equation in a Melbourne school practical has total charge \(4+\) on one side and \(7+\) on the other. Calculate the electron count needed to equalise charge. Use the visual evidence before connecting the answer to the chemical rule. Enter the answer and choose the interpretation that matches the chemistry.
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.