5 Energy changes

• Energy changes


  An important part of chemical reactions
• Interaction of particles


  • Often involves transfers of energy due to the breaking and formation of bonds
• Exothermic reactions


  Reactions in which energy is released to the surroundings
• Endothermic reactions


  Reactions that take in thermal energy
• These interactions between particles can produce heating or cooling effects that are used in a range of everyday applications
• Some interactions between ions in an electrolyte result in the production of electricity
• Cells and batteries


  Use chemical reactions to provide electricity
• Electricity


  Can be used to decompose ionic substances and is a useful means of producing elements that are too expensive to extract any other way