Hello hello Melissa Maribel here to show
you how to predict products of chemical
reactions. For predicting products make
sure you guys know your charges of all
of your elements and your polyatomic
atoms. Alright are you ready to get
started? Let's dive right in.
For this example we are only given our
reactants and we're gonna determine our
products. So what I like to look at is my
little trick for you. Kind of like
FOIL-ing, going back to math. The inner
goes with the inner and the outer goes
with the outer. So if we apply that trick
where our inner elements then combine to
form a compound. Let's go ahead, and
always remembering that our metal goes
first, so the positive goes first then
the negative goes first. How I like to
remember this is, you always want to be
positive before your negative. This is
going back to you also an ionic compound
where we have a metal that's positively
charged combined with a nonmetal that's
negatively charged. So aluminum has a
3+ charge and phosphate, one of
our polyatomic atoms, has a 3-
charge. So luckily right then and there
that's completely balanced for our
charges. So our first product we don't
have to add any other subscript and it's
just aluminum and phosphate. That's the
inner with the inner. Now let's look at
our outer with our outer. So our outer
with our outer, we'll combine these two
to form our next product, or our next
compound. Always thinking positive before
we think negative and we're going to put
that potassium first since that is our
metal and that's our positive charge and
then it will be followed by nitrate
since that's our negative charge. So
potassium has a +1 charge and
nitrate or NO3 has a -1
charge. Note
that I did not bring this subscript that
3 on down because that 3 was
only there to balance out the charges
within potassium, within this
compound as a whole.
Same thing with this other subscript of
3, for nitrate I did not bring that
down, this is a totally different 3
right I took that 3 from O3
because that's just what our polyatomic
atom is. So these other substrates do not
come down when you're predicting your
products. Now continuing with this, our
charges are completely balanced so we
will get our next product of potassium
nitrate. Note that I have not balanced
this out I'm actually not going to be
balancing equations right now just
showing you how to predict products as a
whole. Let's try another example with
that whole inner with the inner and
outer with our outer to predict our
products given our reactants. So our
inner with our inner, this sodium and the
nitrate. Those two would combine to form
our first product. Remember you want to
think positive before you think negative.
So our positive is that metal or that Na.
This has a positive 1 charge I'm not
bringing that 2 subscript down because
that 2 was only there to balance out
sodium within this compound or
combining to carbonate. Next let's go
ahead and bring down that NO3 with a
-1 charge, once again I'm not
bringing down that 2 subscript, looking
back at our compound that forms our
product that forms it's completely
balanced of charges so we will get our
first product of sodium nitrate. Now
let's look at our next product, the outer
with the outer, so magnesium with
carbonate. These two would then combine
to form our final product and this would
give us Mg, so remember positive before
you think negative, and we'll have
magnesium with a 2+ charge and Co3
or carbonate with a 2- charge.
How lovely they are balanced out for us,
the charges are already.
So that would be our final product,
magnesium carbonate. Once again I did not
balance out our overall chemical
reaction, just showing you how to predict
products with the inner with the inner
and outer with the outer. I encourage you
to keep going, keep practicing, keep
trying your best. You can and you will
pass chemistry. If you still feel like
you have some questions that you just
really aren't sure of, reserve your spot
today for live tutoring with myself
where you can ask those questions and
learn and get into a lot of detail with
examples and just overall practice
problems understanding these chemistry
concepts as a whole. If you learned
something today make sure to give this
video a LIKE and subscribe if you want
to keep on learning more things about
chemistry. I'll see you guys next time.
