Edexcel AS Level Chemistry Unit 1 REVIEW QUESTIONS 2024 WITH CORRECT ANSWERS

Enthalpy change is... - correct answerThe term used to describe the energy exchange that takes place with the surroundings at a constant pressure Enthalpy is... - correct answerThe total energy content of the reacting materials Catalyst is... - correct answerA substance that increases the reaction rate by providing an alternative route with lower activation energyand it does not get used up Activation energy is... - correct answerThe minimum energy needed to break the bonds in the reactants and start a reaction Standard enthalpy of formation is... - correct answerThe enthalpy change when 1 mole of a substance is formed from its elements in their standrad states under standard conditions (298 K and 1 atm) Standard enthalpy of combustion is... - correct answerThe enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions *Always exothermic Standard enthalpy of neutralization is... - correct answerThe enthalpy change when an aqueous solution of an acid and a base react in quantities associated with the transfer of 1 mole of protons to give 1 mole of water according to a specified equation under standard conditions *Always exothermic Standard enthalpy of reaction is... - correct answerThe enthalpy change for a reaction between a number of moles of reactants shown in the equation under standrad conditions