Whole Topic Checklist

•  Describe how energy is transferred to or from the surroundings during a chemical reaction
•  Explain exothermic and endothermic reactions on the basis of the temperature change of the surroundings and give examples of everyday uses
•  Required practical 4: investigate the variables that affect temperature changes in reacting solutions
•  Describe what the collision theory is and define the term activation energy
•  Interpret and draw reaction profiles of exothermic and endothermic reactions, inc identifying the relative energies of reactants and products, activation energy and overall energy change
•  HT ONLY: Explain the energy changes in breaking and making bonds and calculate the overall energy change using bond energies
•  Chem ONLY: Describe what a simple cell and a battery is and how they produce electricity
•  Chem ONLY: Describe why alkaline batteries are non-rechargeable, state why some cells are rechargeable and evaluate the use of cells
•  Chem ONLY: Describe fuel cells and compare fuel cells to rechargeable cells and batteries
•  Chem ONLY: Describe the overall reaction in a hydrogen fuel cell
• Chem & HT ONLY: Write half equations for the electrode reactions in a hydrogen fuel cell

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