Why a substance that speeds up a chemical reaction without being permanently changed itself?

Answer 1

A Catalyst.

From wikipedia: "Catalysis is the process in which the rate of a chemical reaction is increased by means of a chemical substance known as a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. The catalyst may participate in multiple chemical transformations."

http://en.wikipedia.org/wiki/Catalyst

Answer 2

Catalysts increase the rate of reaction without being permanently changed themselves. They do so by providing an alternative reaction pathway with lower activation energy than the pathway followed without addition of the catalyst.

Answer 3

A substance that speeds up a chemical reaction without being permanently changed itself is called a catalyst. Catalysts work by providing an alternative pathway for the reaction that has a lower activation energy, allowing the reaction to occur more quickly without being consumed in the process. This means that the catalyst can be used repeatedly to facilitate multiple reactions.

Answer 4

A Catalyst speeds up a reaction with out being used or altered itself.

Answer 5

These are called catalysts.

Answer 6

ENZYME?

Answer 7

catalysts

Answer 8

A catalyst.