Exothermic And Endothermic Flashcards
What happens in an exothermic reaction?
Heat is released to the surroundings, increasing the temperature.
Give examples of exothermic reactions.
Combustion, neutralization reactions, and oxidation reactions.
What happens in an endothermic reaction?
Heat is absorbed from the surroundings, decreasing the temperature.
Give examples of endothermic reactions.
Thermal decomposition and reactions in sports injury packs.
Why are exothermic reactions useful?
They release heat that can be used for heating or energy generation.
What is a common example of endothermic reactions in daily life?
Sports injury packs, where the chemical reaction cools the pack instantly.
Explain the difference between ‘exothermic’ and ‘endothermic’.
‘Exothermic’ means heat exits to the surroundings, while ‘endothermic’ means heat is absorbed from the surroundings.
How can energy transfer in a reaction be measured?
By using a thermometer to measure the temperature change in a polystyrene cup.
What factors affect the amount of energy released in a reaction?
Concentration of reactants, temperature, and surface area.
What does a reaction profile show?
The relative energies of reactants and products during a reaction.
What does the height difference in a reaction profile indicate?
The energy change during the reaction.
How do exothermic and endothermic reactions differ in reaction profiles?
Exothermic: Products are at a lower energy level than reactants. Endothermic: Products are at a higher energy level.
What is activation energy?
The minimum energy needed for reactants to collide and react.
How does concentration affect the energy released in a reaction?
Higher concentration typically increases the energy released.
What is the formula for energy transfer?
Energy transferred = mass x specific heat capacity x temperature change.
