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6. What does not happen in an endothermic reaction

  • ΔH has a positive sign becaue the heat has been gained by the chemical system
  • the enthalpy of the products is greater than the enthalpy of the reactants
  • there is a heat gain to the chemical system from the surroundings

7. Define the law of conservation of energy

  • energy cannot be created or destroyed
  • energy can be created or destroyed
  • energy can sometimes be created or destroyed

8. What does not happen in and exothermic reaction?

  • the enthalpy change of the products is greater than the enthalpy change of the reactants
  • ΔH has a negative sign because heat has been lost by the chemical system
  • the enthalpy of the products is smaller than the enthalpy of the reactants
  • there is a heat loss from the chemical system to the surroundings

9. What is an example of an endothermic reaction?

  • self-destructing cans
  • self-cooling cans
  • self-heating cans

10. What is an example of an exothermic reaction?

  • self-heating cans
  • self-cooling cans
  • self destructing cans