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    Home » Colourful ice and some salt

    Colourful ice and some salt

    January 28, 2015 By Emma Vanstone 1 Comment

    I’ve gone a bit ice crazy this week, my freezer is full of all kinds of weird and wonderful creations which I’ll be showing you soon. First up is this block that I froze with straws inside, then after letting it melt for a while, removed the straws and put coloured water through so we could see the path. It worked brilliantly, so next time I’m going to try a swirly tube.

    DSC_0015

     

    DSC_0012

     

    Next we poured some warm water down the straw hole to see what happened.

    DSC_0024

     

    You can see here that the warm water has melted the ice and the straw hole is much bigger.

    The video shows this in action.


    We then tried adding salt to our ice. You can see here that the parts of the block with salt on top have melted faster than the rest.

    DSC_0034

     


    What did we learn?

    We learnt that warm water melts ice faster than cold water.

    Why does salt melt ice?

    Salt makes ice melt faster, this is because salt lowers the freezing point of water.

    Other ideas to try

    Can you freeze salty water? Does it then melt faster than normal water?

    Could you freeze your block so you can run two colours through it and get them to mix at the end?

    ice-and-salt

     

    Last Updated on April 5, 2016 by Emma Vanstone

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    Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

    These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

    Reader Interactions

    Comments

    1. Regina

      March 08, 2017 at 5:24 pm

      Such a deep anewrs! GD&RVVF

      Reply

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