Physical property → can be observed without changing the identity and composition of the substance
Chemical property → describes the way a substance may change and react to form other substances
Different ions of the same element have different properties. Both substances shown are compounds of iron. The substance on the left is Fe3O4, which contains Fe2+ and Fe3+ ions. The substance on the right is Fe2O3, which contains Fe3+ ions.
Is the difference in properties we see between the two substances in the figure a difference in physical or chemical properties?
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