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Chemistry: Predicting and identifying reactions and products

Quick questions on Predicting reactions: the reactivity series and displacement - OCR GCSE Combined Science A

1short 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 unbalanced charges in a half equation?
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The electrons must make the charge balance, for example FeFe2++2e\text{Fe} \rightarrow \text{Fe}^{2+} + 2e^- has zero charge on each side.

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