exothermic and endothermic reactions

• when chemical reactions happen, energy transferred from the surroundings
• when energy is transferred to the surrounding, this is called exothermic reactions and usually feels hot
• when energy is taken from the environment it is called endothermic reactions and normally feel cold
• exothermic

  exothermic reactions are chemical reactions which release chemicals into surrounding. The energy is usually released as heat. Exothermic reactions don't always release heat the sometime release light
• endothermic

  endothermic reactions absorb energy from surroundings. this energy is usually absorbed as heat to the surroundings get colder