Freezing and melting in LKS2

This could describe the children when going out to break and then coming back in, but it’s really all part of our Science work on the States of Matter.

We discovered that freezing and melting are the result of heating and cooling and that they are reversible changes. You can heat a solid until it melts and becomes a liquid, then cool it until it solidifies and becomes yes, you guessed it – a solid.

We investigated the melting points of different substances in different water temperatures – 30 degrees, 45 degrees and then 60 degrees. We observed each substance for 2 minutes at each temperature and noted any changes before pooling our data and discovering what we had found out.

The children noted that butter and coconut oil had the lowest melting points as they became liquid at lower temperatures. They also inferred that metal has a high melting point because it didn’t melt in our investigation but that, as a solid, it would melt if it was hot enough.

We then put our substances into cold water and watched the butter, coconut oil and chocolate solidify once more.

Heating and cooling had no effect
The chocolate became shiny where it began to melt
The butter melted at the lowest temperature
The wax began to soften and go shiny at 60 degrees
When we cooled the substances again, they solidified but in a different shape to when we first got them

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