Which one of these reactions is energy released? a all reactions b no reactions c endothermic reactions d exothermic reactions

 The  reaction  that is energy released  is exothermic  reactions (answer D)

  Explanation

Exothermic  reaction  is a chemical reaction  that releases energy  through heat or light.

Example  of exothermic reaction is   combustion reaction  such as  lighting a candle  which produces  carbon dioxide, water and heat.

 Endothermic reaction in  other  hand it  is  a chemical  reaction that  absorb energy  from the surrounding.

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frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa