By using your mind and imagination, you CHEAT! XP
Nickel
The term catalyst is much more general than the term hardener, since hardening is only one of endless numbers of processes which can be catalysed. A hardener, therefore, would be a specific type of catalyst.
Enzyme slow down a reaction while catalyst speed up reactions. Enzyme contain a zinc content which makes it a metal, as well as catalyst; so that is one example of their simularities.
The spark is the activation energy. It is the catalyst of the chemical reaction.
Crossover
This element is ruthenium (Ru), atomic number 44.
The difference between a homogeneous and a heterogeneous catalyst is that in a heterogeneous catalyst, it is in a different phase from the reactants. However, in a homogeneous catalyst, it is in the same phase as the reactants.
Ruthenium.
The heterogeneous catalyst is not mixed with the reactants.
A catalyst speeds up a reaction and an inhibitor slows down a reaction
Catalyst speeds up reactions, and inhibitors are used to slow down reactions.
Nickel
Is aqueous copper (2)sulphate an effective catalyst in the reaction between zinc and hydrochloric acid.
The substances which increase the rate of a chemical reaction are called a Positive Catalyst whereas The substances which decrease the rate of a chemical reaction are called Negative Catalyst. Positive Catalyst decreases the Activation energy of reactant molecules whereas negative catalyst increases the Activation energy of the reactant molecules. Positive Catalyst is also called the Promoter whereas negative catalyst is also called Inhibitor.
Catalyst: a substance which promote and help a chemical reaction. Inhibitor: a substance which greatly reduces the rate of a chemical reaction.
The man had to decide between buying a cat, or a dog.
A catalyst lower the activation energy (speeds up the reaction) while an inhibitor increases the activation energy (slows it down).