What is chemistry.
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A train covers 200 km in first 2 hour 126 query in the next two hours and finally 143 km in the last hour find the average speed of a train for the whole of this journey.
Answer me fast it's argent.
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Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other Substances.
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