What do these two changes have in common?

chemicals in a battery reacting to a power flashlight

an old sandwich rotting in a trashcan

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What do these two changes have in common?

knitting yarn into a scarf

filtering air to remove dust and pollen

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What do these two changes have in common?

baking a loaf of bread

salt and vinegar removing tarnish from a penny

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What do these two changes have in common?

rust forming on a metal gate

silver jewelry tarnishing

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What do these two changes have in common?

making jam

a piece of avocado turning brown

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How are feeling right now?

What do these two changes have in common?

water boiling on a stove

using a large magnet to remove pieces of iron from a junkyard

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