WGU C451/Integrated Science/ 87 Questions With Updated Answers

what happens during a chemical reaction.️️one or more new compounds are formed as a result of the rearrangement of atoms. Explain why the law of conservation of energy is important in chemical reactions.️️states that matter is neither lost nor gained in traditional chemical reactions; it simply changes form. Thus, if we have a certain number of atoms of an element on the left side of an equation, we have to have the same number on the right side. This implies that mass is also conserved during a chemical reaction Explain how concentration of reactants affect the reaction rate of chemical reactions️️One effective way to increase the rate of collisions is to increase the concentration of reactants. The reason is simply that, with higher concentrations, there are more molecules in a given volume, which makes collisions more probable Explain how temperature affect the reaction rate of chemical reactions️️Higher temperatures tend to increase reaction rates. The reason is that the higher the temperature of a material, the faster its molecules are moving, and the more forceful the collisions between them so the more likely that these collisions will break bonds within reactant molecules. Explain how the addition of a catalyst affect the reaction rate of chemical reactions️️a substance that increases the rate of a chemical reaction by lowering its activation energy. The catalyst may participate as a reactant but it is then regenerated as a product and is thus available to catalyze subsequent reactions. Define activation energy️️the energy barrier that has to be overcome for a reaction to happen. Explain how catalysts affect activation energy.️️Catalysts lower the activation of the energy enough so the reaction speeds up.