Exothermic & Endothermic

• Exothermic

  Releases energy, heat is given out, increase in temperature, particles break apart, negative enthalpy change (ΔH)
• Physical Changes

  • No new substance is formed, properties like state of matter, shape, size may change, reversible (some)
• Chemical Changes

  • New substance is formed, colour change may take place, changes in smell may occur, irreversible
• Exothermic reactions release energy
• Endothermic reactions absorb energy
• Exothermic reactions release energy, while endothermic reactions absorb energy.
• Is combustion an exothermic or endothermic reaction?

  Exothermic
• Is aerobic respiration an exothermic or endothermic reaction?

  Exothermic
• Is alkali + water an exothermic or endothermic reaction?

  Exothermic
• Is metal + acid an exothermic or endothermic reaction?

  Exothermic
• Is freezing an exothermic or endothermic reaction?

  Exothermic
• Is decomposition an exothermic or endothermic reaction?

  Endothermic
• Is melting an exothermic or endothermic reaction?

  Endothermic
• Is sodium hydrogen carbonate + acid an exothermic or endothermic reaction?

  Endothermic