energy transfers

• What is an exothermic reaction?

  It releases energy into the surroundings.
• What happens to the surroundings during an exothermic reaction?

  They heat up due to energy release.
• Give an example of an exothermic reaction.

  Burning fuels like wood or gas.
• What is an endothermic reaction?

  It absorbs energy from the surroundings.
• What happens to the surroundings during an endothermic reaction?

  They cool down due to energy absorption.
• Give an example of an endothermic reaction.

  Photosynthesis.
• What is the sign of ΔH for endothermic reactions?

  Positive ($+$$\Delta H$).
• In exothermic reactions, how do the energy levels of reactants compare to products?


  Reactants have higher energy than products.
• What is activation energy?

  The minimum energy needed to start a reaction.
• What does an energy diagram for an exothermic reaction show?

  Reactants at a higher energy level than products.
• What does an energy diagram for an endothermic reaction show?

  Reactants at a lower energy level than products.
• What is a real-life example of an exothermic reaction?

  Burning wood or gas.
• What is a real-life example of an endothermic reaction?

  Boiling water.
• What happens to energy in exothermic reactions?

  Energy is released to the surroundings.
• What happens to energy in endothermic reactions?

  Energy is absorbed from the surroundings.
• How can you distinguish between exothermic and endothermic reactions based on temperature changes?


  Exothermic increases temperature; endothermic decreases it.
• If a reaction absorbs energy and cools its surroundings, what type of reaction is it?

  Endothermic reaction.
• If a reaction releases energy and heats its surroundings, what type of reaction is it?

  Exothermic reaction.
• What is the significance of the activation energy peak in a reaction?

  It indicates the minimum energy needed to start.
• What is the relationship between energy diagrams and reaction types?

  Energy diagrams visually represent energy changes.
• How do exothermic and endothermic reactions affect their surroundings?


  Exothermic warms; endothermic cools surroundings.