SCIENCE - FACTORS AFFECTING CHEMICAL REACTION

• Collision Theory states that atoms or molecules must collide with enough energy in order to react.
• The reactants in a chemical reaction must also collide to form a new product.
• When molecules collide, a certain minimum energy called activation energy is required for a reaction to occur.
• The activated complex is located at the peak of the energy diagram for a reaction.
• Activation energy is needed to break the bonds of the reactants to form new products or new substances.
• The speed or rate of chemical reactions is altered or changed by the following factors: 1. Particle size or surface area of reactants 2. Concentration of the reactants 3. Temperature 4. Presence of catalyst
• When solid reactants are present in small pieces, reaction rates can increase
• SURFACE AREA - The smaller pieces have a greater surface area, thus, providing much greater contact among the reactants and effecting more collisions
• Corrosion results in the deterioration of the metal
• Concentration is the measure of the number of particles of solute contained in each volume of solution
• When there are a great number of particles, there is a high concentration leading to greater chances of collision
• The greater the number of particles, the greater the collision.
• as the temperature rises, the molecules in hot water move faster and therefore collide more and have greater chances to react with each other than in the cold water
• Increasing the temperature increases the rate of reaction
• Catalyst is the substance that alters the rate or speed of chemical reactions
• Inhibitors are catalysts that slows down a reaction
• When lighted match is placed near the mouth of the test tube, it will be reignited
• when small amount of MnO2 is added, bubbles can be seen immediately signifying that there is reaction happening
• A catalyst alters the speed of reaction by changing the activation energy.
• The reactants in a chemical reaction must collide to form a new product.
• Collision Theory states that atoms or molecules must collide with enough energy in order to react.
• When molecules collide, a certain minimum energy called activation energy is required for a reaction to occur. This was suggested in 1888 by Svante Arrhenius
• Catalyst – Substance which increases the rate of a chemical reaction without being consumed itself.
• Reactants required an amount of energy in a period to produce products
• Activation energy is needed to break the bonds of the reactants to form new products or new substances.
• Activated Complex is located at the peak of the energy diagram for a reaction
• The smaller pieces have a greater surface area, thus, providing much greater contact among the reactants and effecting more collisions.
• Increasing the temperature increases the rate of reaction. As the temperature rises, the molecules move faster and therefore collide more and have greater chances to react with each other.
• A catalyst is a substance that alter the rate of a chemical reaction without being used up in the reaction. The catalyst may be recovered unchanged at the end of the process.
• The greater the number of particles, the greater the collision.
• The concentration is the measure of the number of particles of solute in a given volume of solution.
• Suggestion of Svante Arrhenius in 1888 about chemical reactio

  Particles must possess a certain minimum amount of kinetic energy in order to react.
• best describes Collision Theory

  Atoms or molecules must collide with sufficient amount of energy in order to react.
• How will you increase the rate of a chemical reaction

  add catalyst
• The amount of energy required to break the bonds between the reacting molecules is known as activation energy
• Concentration of Solution is the measure of the number of particles of solute in a given volume of solution.
• Activated Complex refers to the peak of the energy diagram for a chemical reaction
• How will crushing a solid into a powder increase reaction rate

  The powdered form has more surface area
• Best explanation for temperature increase

  At higher temperature, the particles have more energy, move faster and collide more often
• When a lit match touches the wick of a candle, it begins to burn. When the match is removed, the candle continues to burn. The match supplies the activation energy