Plzzz fas answerrr Which answer choices correctly describe why the number of known elements more then doubled by 1861

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block

Pls ill give u brainliest which of the following is true about science? 1. political conditions are unable to influence it. 2. economic concerns may prevent it from solving problems.