endothermic + endothermic reactions

• What are endothermic and exothermic reactions primarily about?

  Taking in and giving out energy
• How do endothermic reactions behave in terms of energy?

  They take in energy from the surroundings
• What is an exothermic reaction?

  A reaction that gives out energy
• What usually indicates an exothermic reaction?

  Rise in temperature of surroundings
• What usually indicates an endothermic reaction?

  Fall in temperature of surroundings
• What do reaction profiles show in chemical reactions?

  • Energy levels of reactants and products
  • Determine if energy is released (exothermic) or taken in (endothermic)
• What does a reaction profile indicate for an exothermic reaction?

  Products are at lower energy than reactants
• What does the height difference in a reaction profile represent for exothermic reactions?

  Energy given out in the reaction
• What does a reaction profile indicate for an endothermic reaction?

  Products are at higher energy than reactants
• What does the height difference in a reaction profile represent for endothermic reactions?

  Energy taken in during the reaction
• What is activation energy?

  Minimum energy needed for a reaction
• How is activation energy represented on a reaction profile?

  Energy difference between reactants and peak
• How can you visualize activation energy in a real-world scenario?

  Like climbing a hill before descending
• What happens if energy input is less than activation energy?

  No reaction will occur
• What does "exo" and "thermo" mean in exothermic reactions?

  "Exo" means exit; "thermo" means heat
• What does "endothermic" mean in terms of energy?

  It means taking in heat
• What are the steps to draw a reaction profile for the combustion of methane?

  1. Identify reactants and products
  2. Determine energy levels
  3. Plot energy levels on a graph
  4. Show energy difference