KA 3: Energy From Fuels

• What is combustion?

  A reaction of a substance with oxygen
• What happens during combustion reactions?

  Energy is released when reacting with oxygen
• What is an endothermic reaction?

  A reaction that absorbs heat energy
• How do endothermic reactions differ from exothermic reactions?

  Endothermic absorbs heat; exothermic releases heat
• What is the specific heat capacity of a substance?

  Energy required to heat by 1 degree Celsius
• Why is it important to calculate the temperature difference in specific heat capacity?

  It ensures correct energy calculations
• What is the equation for specific heat capacity?

  Eh = cm(delta)T
• What are the key points about combustion reactions?

  • Combustion involves a substance reacting with oxygen
  • Energy is released during combustion
  • Endothermic reactions absorb heat energy
  • Exothermic reactions release heat energy
• What are the key points about specific heat capacity?

  • Specific heat capacity is energy needed to heat by 1°C
  • Important to calculate temperature difference
  • Equation: $Eh =$$cm(delta)T$
• How does the process of combustion relate to energy release?

  Combustion reactions release energy when reacting
• If a substance's temperature increases by 5°C, how should you calculate energy using specific heat capacity?

  Use the temperature difference of 5°C