It speeds up the chemical reaction. Sometimes without enzymes reactions would be so slow.
ENzyme
because you get to watch the reaction being formed
I think it frees itself from the product and is ready to be reused.
ENZYME
That is an enzyme
The enzyme is written above the arrow of the chemical equation because it is involved in the reaction without being changed by it or used up in the reaction. It is not a reactant or a product.
All enzyme's are catalysts for certain chemical reactions. Each enzyme will only work with a certain substrate one analogy being that the enzyme is a key and the substrate is a keyhole, and each enzyme has a unique enzyme.
All reaction, regardless of being exergonic, need energy to complete/go through the reaction. Enzymes lower that activation energy.
Yes. Enzymes are pretty much known as catalysts, and the definition of a catalyst is "a substance that increases the rate of a chemical reaction, without being consumed or produced by the reaction." So thus we see the enzyme being active in a reaction but not destroyed. There are exceptions to this, though. If an enzyme is kept in hot, unfavorable temperatures, it will change shape or become "denatured" and may become useless in a very short time.
fit into the active site on the enzyme
All reaction, regardless of being exergonic, need energy to complete/go through the reaction. Enzymes lower that activation energy.
Catalase is an enzyme that is present in potatoes that catalyzes the decomposition of the hydrogen peroxide into H20 (water) and O2 (oxygen). This oxygen that is being formed in the enzymatic reaction is the cause for the bubbles that you see forming.