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Unit 8: Chemistry Page 21
Activities, Experiments, Projects
Lesson 1: Molecules
Note: This section is an abbreviated overview of the experiments online.
cold) or produces heat (gets
Experiment: Chemical
warm), it’s a chemical change.
Matrix
If you love the idea of mixing up What about physical changes?
chemicals and dream of having Some examples of physical
your own mad science lab one day, changes include tearing cloth,
this one is for you. You are going rolling dough, stretching rubber
to mix up each solid with each bands, eating a banana, or blowing
liquid in a chemical matrix. bubbles.
In a university class, one of the Your solutions will turn red,
first things you learn in chemistry orange, yellow, green, blue,
is the difference between physical purple, hot, cold, bubbling,
and chemical changes. An example foaming, rock hard, oozy, and
of a physical change happens when slimy, and they’ll crystallize and gel
you change the shape of an object, — depending on what you put in
like wadding up a piece of paper. and how much!
If you light the paper wad on fire, Materials:
you now have a chemical change. • sodium tetraborate (borax,
You are rearranging the atoms that laundry aisle): solid
used to be the molecules that • sodium bicarbonate (baking soda,
made up the paper into other baking aisle): solid
molecules, such as carbon
• sodium carbonate (washing soda,
monoxide, carbon dioxide, ash,
laundry aisle): solid
and so forth.
• calcium chloride: solid
How can you tell if you have a
• citric acid (spice section): solid
chemical change? If something
• ammonium nitrate (single-use
changes color, gives off light (such
as the light sticks used around disposable cold pack): solid
Halloween), or absorbs heat (gets • isopropyl rubbing alcohol: liquid
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