What does one mean by exothermic and endothermic reactions? Give examples.
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What does one mean by exothermic and endothermic reactions? Give examples.
Exothermic reactions are chemical reactions that release energy, often in the form of heat. During an exothermic reaction, the total energy released is greater than the energy required to start the reaction, resulting in a net release of energy.
Endothermic reactions are chemical reactions that absorb energy, often in the form of heat. During an endothermic reaction, the total energy absorbed is greater than the energy released, resulting in a net absorption of energy.
Here are some examples of exothermic and endothermic reactions:
Exothermic: 2H2 + O2 -> 2H2O (water)
This is the reaction between hydrogen and oxygen to form water, which releases energy in the form of heat.
Endothermic: CaO (s) + H2O (l) -> Ca(OH)2 (s)
This is the reaction between calcium oxide and water to form calcium hydroxide, which absorbs energy in the form of heat.
Exothermic: 2Na (s) + 2H2O (l) -> 2NaOH (aq) + H2 (g)
This is the reaction between sodium and water to form sodium hydroxide and hydrogen gas, which releases energy in the form of heat.
Endothermic: 2HCl (aq) + Ca(OH)2 (s) -> CaCl2 (aq) + 2H2O (l)
This is the reaction between hydrochloric acid and calcium hydroxide to form calcium chloride and water, which absorbs energy in the form of heat.