Laira Green Primary School

Tel: 01752 660427 Email:laira.green.primary.school@plymouth.gov.uk Bramley Rd, Laira, Plymouth, PL3 6BP

Dissolving in Cherry Class

As part of our topic on properties and changes of materials, Cherry class have been dissolving solids into liquids.  We thought about “which solids do we see dissolved in real life?” There are 9 teaspoons of sugar in a can of coke!!! (Even though you can’t see them).

We tested flour, sugar, salt, bicarbonate of soda, Epsom Salts, hot chocolate, glitter, soil, sand, indigestion tablets, dried peas etc to see which dissolved. We then thought about what would happen if we heated the water.  Every child in Cherry Class came up with their own experiment and here are some pictures of our young scientists carrying out their tests…

We discovered that:

  • salt and sugar dissolve more quickly in hot water than they do in cold water.  
  • Indigestion tablets dissolve a bit (they get a bit smaller) but not completely and they turn the water cloudy.  
  • Flour does not dissolve and makes the water all sludgy, like a paste (that’s why it’s good for using in gravy and cauliflower cheese).
  • Sugar dissolves really easily into water, but a few crystals usually hang around at the bottom of the jar.

 

If you want to read about dissolving at home, click on this link for a video:

https://www.youtube.com/watch?v=J7UJa4t1e5Q

Or click on this link for something to read about dissolving:

http://www.bbc.co.uk/bitesize/ks2/science/materials/changes_materials/read/1/

 

HOME CHALLENGE:

 

Which dissolves better – salt or pepper?

Why?

Send your answers to Mrs Nightingale on our school email.

Answers will be read out in Assembly.

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This entry was posted on June 16, 2017 by in Uncategorized.

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