hi
we are now revisiting this um
demo right here remember we made
observations of that shiny metallic
looking
solid metal called zinc and then
remember we made
um observations of the high court
hydrochloric acid that we added
now we're revisiting because i'm going
to add two more things to the same
test tube but let's see what it looks
like right now it's been sitting for
about five
or six minutes you can see um some
things have been occurring there
and just move that around so you can
maybe add more observations if you'd
like before i add the next two reactants
if you see anything else that you're
like hey
i didn't notice that
when you first did it all right
so the two reactants so what i'm going
to do
is show you this reactant sodium
hydroxide
and if you look this is the sodium
hydroxide it is clear
and it's colorless so you want to write
the observation over here
and then i'm going to show you the other
reactant i'm going to be using
which is the indicator and if you look
at that it's clear
and it's colorless
but once i added that sodium
hydroxide to this test tube with these
reactants
i want you to make an observation of
what you notice
what do you see is there anything
different
than the observations you have already
listed so let me give you a couple
seconds to write down what you observe
okay now what i'm going to do is add the
next reactant
the indicator so i'm going to add
just a little bit of this
and i want you
to notice what in the world do you see
is there anything new that you see and
if you could write down
observations of what you are observing
that would be awesome and remember what
you have to do in the next column is you
have to decide
gosh was this entire demonstration an
example of a physical change
or a chemical change and then explain
your your choice
why do you think it was a physical or
chemical change
