00:02
Hi there.
00:03
In these two questions, we are trying to classify exothermic and endothermic reactions.
00:11
So let's define both of these before we start.
00:15
An exothermic reaction, we see the prefix exo, which means out of, and therm refers to heat.
00:23
But technically, exothermic can refer to any type of energy and refers to a reaction, any reaction that releases energy.
00:37
Energy is being given off or released.
00:41
Since it's being given off or released, we will see energy as a product.
00:54
All right.
00:54
The reverse of exothermic is endothermic.
00:57
Endo means into.
01:03
And this refers to a reaction that takes in energy.
01:14
So in this case, we would see energy as a reactant.
01:28
Okay, so we've defined these.
01:30
I think we're ready to go ahead and answer our questions now.
01:32
The first one, question three, wants to know which is the following are classified as exothermic.
01:45
So question three is looking for exothermic.
01:51
So we are looking either for the reactions that release energy or the ones that release energy and show that energy as a product so that we know it's releasing energy.
02:02
So let's look what we have.
02:03
We have letter in letter a.
02:06
We see on the product side, we see 2 ,220 kilojoules as a product...