Rosa Parks was a true catalyst for change and she was only one person. Hearing about Rosa Parks and her protest showed me that there is hope for me and all the students in Ms. G's classes to truly be catalysts for change.
A substance that promotes a chemical reaction by lowering the activation energy of a chemical reaction, but which itself remains unaltered at the end of the reaction (See Catalytic antibody, Catalytic RNA )
a substance which increases the rate of a chemical reaction without being consumed or produced by the reaction Catalysts speed both the forward and reverse reactions, without changing the position of equilibrium Enzymes are catalysts for many biochemical reactions
A substance that increases the rate of a chemical reaction without being consumed in the reaction A substance that lowers the activation energy for a chemical reaction by providing an alternate pathway for the reaction
You can describe a person or thing that causes a change or event to happen as a catalyst. I very much hope that this case will prove to be a catalyst for change He said he saw the bank's role as a catalyst to encourage foreign direct investment
In chemistry, a catalyst is a substance that causes a chemical reaction to take place more quickly. Any substance of which a small proportion notably affects the reaction rate of a chemical reaction without itself being changed or consumed (see catalysis). One molecule may transform several million reactant molecules a minute. Catalysts may be gaseous, liquid, or solid; they may be inorganic compounds, organic compounds, or complex combinations. They tend to be highly specific, reacting with only one substance or a small set of substances. Substances that reduce the effectiveness of catalysts by altering them or blocking reactants' access to them are called catalyst inhibitors or catalyst poisons. Catalysts are essential to virtually all industrial chemical reactions, especially in petroleum refining and synthetic organic chemical manufacturing. Most solid catalysts are transition elements (metals) or their oxides in finely divided or porous form. In a car's catalytic converter, the platinum catalyst converts unburned hydrocarbons and nitrogen compounds to products less harmful to the environment. Water, especially saltwater, catalyzes oxidation (see oxidation-reduction) and corrosion. Enzymes are among the most active and selective catalysts known
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