Page 148 - Microsoft Word - LessonPlan-Overview.doc
P. 148

So one mole of H 2SO 4 weighs 98 grams. Now use this conversion to

                       find the mass for 42 moles:
                       Grams of H 2SO 4 = 42 moles x (98 grams/1mole) = 4.12 kg

                       So there are 4.12 kg of H 2SO 4 in 42 moles. (That’s a lot – you’d never
                       use that much!)




                   10.        Redox reactions involve electron transferring between atoms.
                       Hydrogen ions (protons) transfers are found in acid-base reactions.

                   11.        Grind up the reactants into a fine powder, swirl them in a
                       minimal amount of water, raise the temperature of the water, and add
                       an appropriate catalyst.

                       Here’s why: Increasing the temperature will usually increase the rate
                       of reaction, as the higher the temperature of the reactants, the more
                       kinetic energy is in the system. Putting the reactants in a solution
                       allows them to not only react on all sides of the substance but also
                       allows the reactants the most amount of freedom to mingle and react
                       with each other. A higher concentration of the reactants increases the
                       reaction rates because the number of collisions increase.  Fine powders
                       react more quickly than large chunks because there’s more area
                       exposed to react when a substance is in powder form, so surface area
                       plays a role in the reaction rates as well. To speed up a reaction
                       without altering the chemistry of the reaction involves adding a
                       catalyst.

































               © 2010 Supercharged Science                                      www.ScienceLearningSpace.com

                                                             550
   143   144   145   146   147   148   149   150   151   152   153