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Equal rates do not mean equal amounts - Paper 1
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
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Closed counter model for a reversible change: container A holds 20 counters and B holds 80. Every round, 4 counters move A to B and 4 move B to A simultaneously. Conditions stay unchanged. Counters represent conserved units in this model, not a complete molecular mechanism.
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