Endo + Exothermic Reactions

• This Graph shows an Exothermic Reaction

  • Lots of Energy would be released, so we should do this in a Sealed Container, to measure the INCREASE in temperature

  A) Reactants

  B) Products

  C) Surroundings

  D) Heat

  
• This Graph shows an Endothermic Reaction

  • This is when Heat Energy is taken IN from the surroundings

  A) Reactants

  B) Products

  C) Absorbed

  
• [Activation Energy] The MINIMUM amount of Energy needed, to start the chemical reaction
• Graphs showing Activation Energy:

  A) Exothermic

  B) Activation

  C) Endothermic

  D) Activation Energy

  
• [Bond Energies] Amount of Energy required to break ONE MOLE of a certain Covalent Bond

  • Endothermic Bond Breaking: Energy must be supplied to break EXISTING bonds
  • Exothermic Bond Formation: Energy is Released when new bonds are Formed

  A) 431

  B) one mole

  C) Avogadro's

  D) surroundings

  E) Release

  F) Mole

  
• Equation for Enthalpy Change (Bond Energies)

  • Enthalpy Change (ΔH) = Energy of Bonds Broken (kJ) - Energy of Bonds Formed (kJ)

  A) Broken

  B) Formed

  
• [Enthalpy Change] is the OVERALL CHANGE in Energy, in a Chemical Reaction. It uses the symbol ΔH (kJ/mol)

  
• Calculating the Heat Energy TRANSFERRED:

  • Q = m x c x ΔT

  A) J

  B) Mass

  C) g

  D) Specific Heat capacity

  E) Temperature

  
• Bond Energy Calculation

  (Enthalpy Change):

  A) absorbed

  B) break

  C) released

  D) making