20 ! balance the following redox equation using the oxidation-number-change method. describe each step you use to balance the reaction. hcl(aq) + zn(s) zncl2(s) + h2(g)

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

A50.0 ml sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. what is the new volume? 0.0100 ml 0.325 ml 25.0 ml 100. ml

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