'Chemical change involves change in energy i.e liberation or absorption of heat.' Give two examples to support this statement.
Answers
Answer:
A fire burning is one of the most noticeable examples of a chemical reaction that produces a lot of energy. All chemical reactions involve energy changes. ... When new bonds form, energy is released. The energy that is needed to break a bond is called the bond energy or bond dissociation energy.
Answer:
Explanation:
fire burning is one of the most noticeable examples of a chemical reaction that produces a lot of energy. All chemical reactions involve energy changes. ... When new bonds form, energy is released. The energy that is needed to break a bond is called the bond energy or bond dissociation energy.Change of color (for example, silver to reddish-brown when iron rusts). Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat. Change of composition - paper turning to ash when burned.