Answer
(a)Burning gasoline produce energy. So, it is an exothermic reaction.
(b)In freezing ice water water produce energy as the water molecule moving speed is slowed releasing energy in process. So, it is an exothermic reaction.
(c)Melting chocolate absorb heat as the molecules absorb more energy to move faster and change from solid to liquid state. So, melting chocolate is an endothermic reaction.
(d)Cooling hot water produce energy as water molecules loss energy as they move slower to reduce temperature. So, cooling water is exothermic reaction.
(e)Condensing water vapor produce energy as water molecules loss energy as they move slower to convert from gas state to liquid state. So, Condensing water vapor is exothermic reaction.
(f)burning a match produce heat. So, it is an exothermic reaction.
Work Step by Step
Exothermic reaction is a reaction in which energy is released in the form of light or heat.
Endothermic reaction are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
(a)Burning gasoline produce energy. So, it is an exothermic reaction.
(b)In freezing ice water water produce energy as the water molecule moving speed is slowed releasing energy in process. So, it is an exothermic reaction.
(c)Melting chocolate absorb heat as the molecules absorb more energy to move faster and change from solid to liquid state. So, melting chocolate is an endothermic reaction.
(d)Cooling hot water produce energy as water molecules loss energy as they move slower to reduce temperature. So, cooling water is exothermic reaction.
(e)Condensing water vapor produce energy as water molecules loss energy as they move slower to convert from gas state to liquid state. So, Condensing water vapor is exothermic reaction.
(f)burning a match produce heat. So, it is an exothermic reaction.
