MELC 24

• collision theory - explains how the collision between reactant molecules may or may not result in a successful chemical reaction.
• the colliding molecules should possess a minimum kinetic energy known as activation energy, to start a chemical reaction. 
• activation energy is needed to break the bond between reactant  molecules to form new bonds leading to formation of products.
• The higher the temperature, the more particles gain energy and cause them to move faster.
• When concentration/ pressure increases, there will be more particles present per unit of volume which makes collisions more frequent.
• The higher the surface area, the higher the reaction rate.
• catalysts are substances that speed up a reaction.
• • a chemical reaction that has an environmental concern is acid rain. 
• acid rain has been leading significant cause of destruction in our environment. In infrastructure, it is the cause of corrosion of metals in alloys like steel in buildings, bridges and transport vehicles.