Lesson 11

• What is a chemical reaction?

  A process where reactants are converted to products.
• What are the two types of substances involved in a chemical reaction?

  Chemical elements and compounds.
• How does a chemical reaction change the constituent atoms?

  It rearranges the constituent atoms of the reactants to create different products.
• What are the factors affecting the rate of a chemical reaction?

  • Temperature
  • Concentrations of Reactants
  • Pressure
  • Particle size
  • Catalyst
  • Physical state
  • Light
• How does temperature affect the rate of a chemical reaction?

  Increasing temperature increases the reaction rate up to a point.
• What happens to the reaction rate when the concentration of reactants is increased?

  Increasing the amount of reactants in a solution increases the reaction rate.
• How does pressure influence the rate of a chemical reaction involving gases?

  Increasing the pressure of gases increases the reaction rate.
• What effect does particle size have on the rate of a chemical reaction?

  Decreasing particle size or increasing surface area increases the rate of reaction.
• What role do catalysts play in chemical reactions?

  Catalysts lower the activation energy of a chemical reaction, making it faster.
• How does the physical state of reactants affect their reaction rate?

  Reactants in the same state of matter react more readily than those in different phases.
• What is the effect of light on certain chemical reactions?

  Light provides the activation energy needed for some reactions, increasing the reaction rate.
• How does the nature of reactants affect the rate of a chemical reaction?

  Some types of reactions are inherently faster than others.
• What are the types of chemical reactions?

  • Synthesis
  • Decomposition
  • Single Replacement
  • Double Replacement
  • Combustion
• What occurs during a synthesis reaction?

  Two or more chemicals bond together forming one new substance.
• What happens in a decomposition reaction?

  One substance breaks down into two or more separate substances.
• What characterizes a single replacement reaction?

  One element knocks another element out of a compound.
• What occurs during a double replacement reaction?

  Two compounds switch ions with each other.
• What defines a combustion reaction?

  A compound burns in oxygen gas, with oxygen always being a reactant.
• What is always a reactant in a combustion reaction?

  Oxygen gas.