The most abundant trace gas in the atmosphere is neon hydrogen argon helium

What does the symbol (–hfus) indicate in a phase change?

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

What is the most common reason for matter changing its state?