True: The inner structure of matters do not change during physical changes., Most physical changes are reversible., Chemical changes are not reversible., 'Baking a cake' is a chemical change., Burning is a process with a high temperature, flames and light., Chemical change :a substance to change into a new substance., 'Slow burning': it takes a long time for oxygen to rust objects., False: Chemical changes are reversible., Burning wood is a physical change., 'Digesting food' is a physical change., Burning doesn't need oxygen from the air., If you burn wood, fire changes the wood into ashes and oxygen., Rusty nails are caused by CO2.,

Chemical changes/Science Book 5

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