Enzymes are biological catalysts. They speed up
metabolic reactions in the body but remain chemically unchanged
themselves. Enzymes contain an active site. This is a region to which another molecule may bind. This molecule is known as the substrate, and is usually specific to the active site of the particular enzyme, which breaks it down. Substrates
will not usually fit into any other active sites other than that of
the enzyme it is specified to. This can be explained as a lock and key
model, where the lock and key are specific to each other, only, that
there are many of the same kinds of lock and key when it come to the
enzymes. The higher the temperature, the higher the rate of
reaction up to a certain point. This is due to the fact that the
particles gain kinetic energy and subsequently move around more
vigorously. Thus, the chance of there being a successful collision
between the enzyme and substrate molecule increases as reacting
particles with collide more frequently with increased kinetic energy. Enzymes have a very specific three-dimensional shape, held together by
ionic and hydrogen bonds. If the amino acids are too vigorous in their
motion, then, these bonds will brake. Once the bonds have been broken,
the enzyme is said to have become denatured. As a result of becoming
denatured, the enzymes' rate of activity becomes less because the
enzyme loses its specific three-dimensional shape. The enzyme will
start to become denatured after around 40ºC as enzyme activity is
usually at its optimum at this temperature. After this, the rate of
reaction will probably deteriorate. After 60ºC, there is likely to be
no reaction, as the enzymes would probably be completely denatured by
then.
Increases reaction rate.
Surface area affect the reaction rate because the contact between finely divided particles is improved.
Increasing the concentraion the reaction rate increase.
It leads to more frequent collisions, which increase reaction rate.
a catalyst can affect the rate of a reaction. speeding it up.
Increasing the temperature the reaction rate increase.
Increasing the concentration of the reactants increases the rate of the reaction.
if gases are involved in the reaction.
Increases reaction rate.
Yes.why
Surface area affect the reaction rate because the contact between finely divided particles is improved.
The rate increases
The more collisions the faster the rate.
?
Increasing the concentraion the reaction rate increase.
Generally increasing the temperature and concentration the reaction rate is higher.
It leads to more frequent collisions, which increase reaction rate.