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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