These four elements are most likely in group Eriq, a chemist, is running tests with four unknown
elements. He has found that they all bond the same
way, so he knows that they are in the same group on
the periodic table of elements. The table shows other
properties that Eriq observed.
O O O O
17.
Properties of Four Unknown Elements
Element # Melting Boiling Phase at room
point point temperature
1
266 K 332 K liquid
2
172 K 239 K
gas
3
387 K 457 K solid
4
53 K 85K
gas

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.