Chapter 8

• Reaction rate is the measurement of how fast a reaction takes place
• Catalysts are substances that speed up chemical reactions without being used up themselves
• Factors that effect reaction rate are: Concentration, surface area, pressure, temperature, and catalyst
• If temperature increase, reaction rate increase
• If concentration increase, reaction rate increase
• If surface area increase, reaction rate increase
• If pressure decrease, reaction rate increase
• If catalyst added, reaction rate increase
• Catalyst is not used up during the reaction
• The reactants must be able to collide with enough energy to overcome activation energy barrier
• collision theory is when particles collide with each other and the energy is sufficient to initiate a reaction
• the minimum amount of energy is known as activation energy
• adsorption is the attachment of molecules to solid surface
• enzymes are sensitive temperature and PH
• presence of catalyst decreases activation energy
• rate = concentration x rate constant
• increasing temp increases kinetic energy, increasing frequency of successful collision
• enzymes are protein molecules that act as biological catalysts
• enzymes are very specific and can only catalyse one reaction at a time
• presence of catalyst: 2H2O2 = 2H2O+O2.
• effect of temperature: NA2S2O3 + 2HCl = 2NaCl + S + SO2 + H2O
• surface area: CaCO3 + 2HCl = CaCl2+H2O+CO2