Here are the answers to your questions:
1. Classification of Changes as Absorbing or Releasing Thermal Energy
- Ice melting: Absorbs thermal energy (endothermic)
- Water evaporating: Absorbs thermal energy (endothermic)
- Water vapor condensing: Releases thermal energy (exothermic)
- Photosynthesis: Absorbs thermal energy (endothermic, as sunlight is used)
- Respiration: Releases thermal energy (exothermic, energy is released when glucose is broken down)
- Combustion of gasoline: Releases thermal energy (exothermic, as heat is produced during combustion)
2. Electrical Power Production in Ontario and Energy Sources
In Ontario, electrical power is produced through various methods that rely on different energy sources:
- Nuclear Power: The primary source, using nuclear fission to generate heat, which produces steam to drive turbines.
- Hydroelectric Power: Dams and water flow are used to spin turbines, generating electricity.
- Natural Gas: Combustion of natural gas produces steam to drive turbines.
- Renewables: Wind, solar, and biomass contribute to electricity generation.
- Coal (Minimal or None): Ontario phased out coal power to reduce emissions.
3. Differences and Similarities Between Nuclear and Hydroelectric Power
Differences:
- Source of Energy: Nuclear power uses uranium (nuclear fission), while hydroelectric power relies on moving water.
- Environmental Impact: Nuclear power produces radioactive waste, while hydroelectric power can disrupt ecosystems and aquatic habitats.
- Operation: Nuclear power plants rely on complex processes like fission and require significant safety protocols, whereas hydroelectric plants use a simpler process involving turbines and water flow.
Similarities:
- Both are reliable sources of energy and provide consistent power (baseload energy).
- Both have high upfront costs for construction but low operating costs over time.
- Both aim to reduce reliance on fossil fuels and contribute to lower greenhouse gas emissions compared to coal or natural gas.
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