Thursday, 20 June 2013

Melting Chocolate

Today we did some more inquiry learning about heat.  We melted chocolate and made shaped chocolates in molds.

First we heated some water in a pot and then we put the chocolate chips in a bowl and put the bowl on top of the water.

The chocolate started to melt quite quickly.  It looked a bit weird when some of it was melted and some was still chocolate chips.

Once all the chocolate was melted it was very gooey and runny.

We put the melted chocolate into molds and then put it in the fridge to set.

Finally, we got to eat it.  Yum!

We talked and wrote about what we had noticed happening to the chocolate.  It changed from being hard to being runny.  Mrs Harrington told us that it changed from a Solid to a Liquid.  We learned that in a solid the particles move slowly and are close together so it is hard.  When you heat a solid the particles start to move faster and move apart from each other and it becomes liquid.  Liquids can be poured because the particles can move more than in a solid.   When we put the chocolate molds in the fridge, the liquid chocolate turned back into a solid because the particles cooled down and stopped moving so fast.

We watched a cool clip here that explained how the particles change when a solid is heated.

What other things do you know that can be changed from a solid to a liquid using heat?  Tell us in the comments!

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