Who discovered the first real evidence of the big bang? neil armstrong mount wilson edwin hubble an unnamed scientist

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

State the effect on the concentration of the clo- ion when there is a decrease in the concentration of the oh- ion

The atoms in a have a definite volume, but move quickly enough to overcome the forces of attraction between them. a. solid b.liquid c.gas