Due to the Coronavirus, smog went down in what city?

Which change to the system wood cause the freely-moving piston to lower?

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

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules