Which of the following groups of chemical elements would you except to be the most alike in their physical and chemical properties

Air can be considered a mixture. which statement does not explain why?

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 formula of the ionic compound composed of calcium cations and chloride anions