how you learned it

　　 Setting up a chain of dominoes stood on end, and toppling the first domino. That domino topples the one next to it, and so on. In the experiment, however long the chain the dominoes will still fall.

　　explain what you learned

　　 This is because the energy required to topple each domino is less than the energy transferred by each impact, so the chain is self-sustaining. Energy is stored by setting each domino in the metastable upright position, and that energy is what keeps the chain toppling.

　　 The domino effect is a chain reaction that occurs when a small change causes a similar change nearby, which then will cause another similar change, and so on in linearsequence.

　　Coins Turned Green 硬币氧化变绿

　　Materials you will need:

　　Saucer

　　Vinegar

　　A Penny

　　Kitchen/Paper Towel

　　Steps:

　　1. Fold the kitchen/paper towel a few times to get a bit of thickness.

　　2. Lay the kitchen/paper towel on top of the saucer and pour out some vinegar until it is soaked up by the kitchen/paper towel.

　　3. Place the penny on the kitchen/paper towel and leave it there.

　　4. Keep a check on the penny and observe the chemical reaction.

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