10) Most of the periodic table is made of what type of elements? (35:00)

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.

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

How have the greenhouse gasses increased from the year 2000 to 2018