Match the following. 1. A substance that produces hydrogen ions in solution; alternatively, a proton donor
2. A substance that produces hydroxide ions in solution; alternatively, a proton acceptor
a. acid
b. base

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.

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

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange