Exothermic and endothermic reactions

What the syllabus asks of you

• State that an exothermic reaction transfers 4 State that the transfer of thermal energy during thermal energy to the surroundings leading a reaction is called the enthalpy change, ∆H, to an increase in the temperature of the of the reaction. ∆H is negative for exothermic surroundings reactions and positive for endothermic
• State that an endothermic reaction takes in reactions thermal energy from the surroundings leading to a decrease in the temperature of the surroundings 5 Define activation energy, Ea, as the minimum energy that colliding particles must have to
• Interpret reaction pathway diagrams showing react exothermic and endothermic reactions 6 Draw and label reaction pathway diagrams for exothermic and endothermic reactions using information provided, to include: (a) reactants (b) products (c) enthalpy change of the reaction, ∆H (d) activation energy, Ea 7 State that bond breaking is an endothermic process and bond making is an exothermic process and explain the enthalpy change of a reaction in terms of bond breaking and bond making 8 Calculate the enthalpy change of a reaction using bond energies