GCSE Exam GCSE Chemistry
                    
                        4.5.1.1 Energy transfer during exothermic and endothermic reactions
                    
                                    
                
                    
                        4.5.1.2 Reaction profiles
                    
                                    
                
                    
                        4.5.1.3 The energy change of reactions (HT only)
                    
                                    
                