1:49 AM Catalysts Speed It Up | |
Catalysts Speed It Up
A catalyst is like adding a bit of magic to a reaction.
Reactions need a certain amount of energy in order to happen. If they
don't have it, oh well, the reaction probably can't happen. A catalyst
lowers the amount of energy needed so that a reaction can happen more
easily. A catalyst is about energy. It doesn't have to be another moelcule. If you fill a room with hydrogen gas (H2) and oxygen gas (O2),
very little will happen. If you light a match in that room (or just
produce a spark), most of the hydrogen and oxygen will combine to create
water molecules (H2O). It is an explosive reaction.
The energy needed to make a reaction happen is called the activation energy. As everything moves around, energy is needed. The energy that a reaction needs is usually in the form of heat. When a catalyst is added, something special happens. Maybe a molecule shifts its structure. Maybe that catalyst makes two molecules combine and they release a ton of energy. That extra energy might help another reaction to occur in something called a chain reaction. In our earlier example, the spark decreased the required activation energy. You could also think of a catalyst like a bridge in some instances. Instead of letting reactions happen in the same (but faster) way, it can offer a new direction or chemical pathway in order to skip steps that require energy. 
Catalysts are also used in the human body. They don't cause explosions,
but they can make very difficult reactions happen. They help very large
molecules to combine. There is another interesting fact about catalysts.
You know that catalysts lower the activation energy required for a
reaction to occur. With the activation energy lower, the products can
also combine more easily. Therefore, the forward and reverse reactions
are both accelerated. It changes both rates and usually changes the equilibrium point.
Inhibitors Slow It Down
There is also something called an inhibitor that works
in exactly the opposite way as catalysts. Inhibitors slow the rate of
reaction. Sometimes they even stop the reaction completely. You might be
asking, "Why would anyone need those?" You could use an inhibitor to
make the reaction slower and more controllable. Without inhibitors, some
reactions could keep going and going and going. If they did, all of the
molecules would be used up. That would be bad, especially in your body.
When you are watching television, you have no reason to keep breaking
down sugars at the same rates you would if you were working out.
| |
|
| |
| Total comments: 0 | |