A unit is Red Blood Cells is issued at 9:00am. At 9:10am the unit is returned to the Blood Bank. The container has NOT been entered, but the unit has NOT been refrigerated during this time span. The best course of action for the technologist is to

this is a good question! i'll do some research and come back when i have the answer!

allowed for the prediction of the properties of missing elements.

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.