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Hi, I'm Jared, and welcome to "Fun Science Demos".
The big idea? In a chemical reaction
a new substance is created. Something else is going on there,
temperature. Heat is actually created or taken away
during that chemical reaction. How do we show you that?
Our temperature probe-it's just a fancy thermometer-
and I need a chemical reaction. I have two substances here
to make that happen. I've already poured the vinegar in my beaker just to speed
things along.
So let's take the temperature of the vinegar. I have my
temperature probe, I'm going to put it in there, and now with this set-up all I do is
collect
the data. And what I'm seeing here
is pretty much a flat, red temperature line.
It's reading 17 degrees Celsius and it's pretty stable-it's pretty flat-nothing's
happening.
So we said the big idea was that heat is either created or taken away during a
chemical reaction; I need a chemical reaction.
Bring in the baking soda. Let's watch our temperature line
as we dump in the baking soda-not the reaction,
the temperature. Here we go. We have a reaction, but
stir this around and I can see the little red bulb line on my thermometer
just start dropping
down. What does that mean? Well, it means my temperature's
getting colder. That heat is being taken away because of this chemical reaction. I
can see the new substance, but
when that new substance is created, it's taking heat away.
My temperature probe proves it. Science is so cool.
Thanks for watching. So where do we get the temperature probe?
This temperature probe's actually called Go!Temp, and it's made by a company called
Vernier.
It's a great company that offers all kinds of probes for teachers in schools
to use in science and any application. We've linked to them below this video.
Check them out.