Temperature and reversible reactions

• What should you be able to describe by the end of this video?

  The effect of temperature on equilibrium
• What principle did we look at in the last video?

  Le Chatelier's principle
• What does Le Chatelier's principle state?

  Systems at equilibrium counteract changes
• What happens during an exothermic reaction?

  Energy is released, increasing temperature
• What is true about the reverse reaction in an exothermic forward reaction?

  It is endothermic
• What happens when the reverse reaction occurs?

  Energy is taken in, decreasing temperature
• What happens if the temperature of the system is increased?

  The equilibrium shifts to the left
• Why does the equilibrium shift to the left when temperature increases?

  To reduce temperature by favoring endothermic reaction
• What happens to the amount of NO2 when temperature is increased?

  It increases
• What happens to the amount of N2O4 when temperature is increased?

  It decreases
• What happens if the temperature of the system is decreased?

  The equilibrium shifts to the right
• Why does the equilibrium shift to the right when temperature decreases?

  To increase temperature by favoring exothermic reaction
• What happens to the amount of N2O4 when temperature is decreased?

  It increases
• What happens to the amount of NO2 when temperature is decreased?

  It decreases
• What are the effects of changing temperature on reversible reactions at equilibrium?

  • Increasing temperature shifts equilibrium left
  • Decreasing temperature shifts equilibrium right
  • Exothermic forward reaction releases energy
  • Endothermic reverse reaction absorbs energy
• What should you do if you find the topic tricky?

  • Watch the video multiple times
  • Review related materials
  • Practice with example questions