Concentrated sulfuric acid is used to promote acid catalyzed dehydration because it has little water.This favor the forward reaction.sulfuric acid acts as as proton source to enable loss of leaving group in forward reaction and electrophile addition in reverse reaction.
Answer: This was because the experiment showed that a substance could emit radiation even while it was not exposed to light.
Increase, because you need heat to melt a solid to a liquid, so the temperature will have to get greater.
The whitening toothpastes showed differences in their physical-chemical properties. All toothpastes promoted changes to the surface, probably by the use of a bleaching agent.
