Hey kids! Here's a simple recipe you can
follow right at home to make your own ice
cream, and do a science experiment at the
same time!
Ice cream in a plastic bag is made by
lowering the freezing point of ice, so the
ice can freeze the ingredients. The scientific
secret ingredient is plain old salt!
You'll make the ice cream by surrounding
the ingredients with a layer of ice cubes.
When you add salt to the ice, the chemistry
forces the ice cubes to melt. (That's why
salt is used on icy roads and sidewalks in
the winter.) When salt and ice mix, the
freezing point of ice is actually lowered
and as it melts, it borrows heat from
the surrounding objects. This is called
an ENDOTHERMIC process. Since
your ice cream ingredients aren't as cold
as the ice, the ice borrows heat from the
ingredients and makes them freeze up into
ice cream. Science never tasted so good!
There is an opposite reaction from
endothermic? While endothermic
reactions absorb heat, EXOTHERMIC
reactions release heat.
42 • Off icialKidsMag.com • SEPTEMBER 2019
By Karen Rice| OfficialKidsMag.com
