Rate of Reaction

• What are reactants in a chemical equation?


  The substances that are used in a chemical equation
• What are products in a chemical reaction?


  The new chemical made after the chemical reaction
• What does the arrow in a chemical equation represent?


  It shows the product of the equation, after the reaction
• What is the Law of Conservation of Mass?


  In a chemical reaction, mass is neither created nor destroyed
• What is an exothermic reaction?


  A chemical reaction that releases energy in the form of light or heat
• What is an endothermic reaction?


  A chemical reaction that absorbs energy
• What does an energy level diagram show?


  It shows whether a reaction is exothermic or endothermic
• What does Collision Theory state?


  A chemical reaction can only occur between particles when they collide
• How does temperature affect the rate of reaction?


  Particles move quickly, making it more likely to have a successful collision
• How does surface area affect the rate of reaction?


  Smaller particles have a greater surface area, leading to more collisions and a higher reaction rate
• How does concentration affect the rate of reaction?


  The more molecules in one space, the more successful collisions occur
• What is the role of a catalyst in a chemical reaction?


  A catalyst increases the rate of reaction but is not used up
• What is combustion?


  A chemical reaction where a substance reacts with oxygen, producing heat and light
• What is respiration?


  The process by which organisms exchange gases, especially oxygen and carbon dioxide
• What is the rate of reaction for combustion?


  Fast
• What are the reactants in the combustion reaction?


  Hydrocarbons & oxygen
• What are the products of combustion?


  Carbon monoxide, nitrogen dioxide, particles, and sulphur dioxide
• Give an example of where combustion occurs.


  Burning of paper
• What are the major differences between combustion and respiration?


  • Combustion is a chemical process outside living cells; respiration is a biochemical process in living cells.
  • Combustion is uncontrolled; respiration is a controlled biological process.
• What is the rate of reaction for respiration?


  Slow
• What are the reactants in the respiration reaction?


  Glucose & oxygen
• What are the products of respiration?


  Energy, carbon dioxide & water
• Give an example of where respiration occurs.

  Fermentation
• Why is combustion considered an uncontrolled process?


  Because it occurs without regulation in a chemical reaction
• Why is respiration considered a controlled biological process?


  Because it is regulated within living cells to release energy