A catalyst is a chemical substance that affects the rate of a chemical reaction by altering the activation energy required for the reaction to proceed. This is called catalysis.A catalyst is not consumed by the reaction and it may participate in multiple reactions at a time.The only difference between a catalyzed reaction and an uncatalyzed reaction is that the activation energy is different. There is no effect on the energy of the reactants or the products. catalyst is a chemical substance that affects the rate of a chemical reaction by altering the activation energy required for the reaction to proceed. This is called catalysis.
A boater hat, also known as a sennit, basher, skimmer, or sailor, is a distinct type of straw hat. This piece of headwear has a stiff flat top and brim. A wide ribbon or piece of material is often wound around the crown of the hat.
A pilgrim's hat, cockel hat or traveller's hat is a wide brim hat used to keep off the sun. It is highly associated with pilgrims on the Way of St. James. The upturned brim of the hat is adorned with a scallop shell to denote the traveller's pilgrim status. type of decorative cap mainly worn in the 19th and early 20th century with sleepwear or lingerie. Bowler / Derby. A hard felt hat with a rounded crown created in 1850 by Lock's of St James's, the hatters to Thomas Coke, 2nd Earl of Leicester, for his servants.