Question

Cldsslly lile duullulldi endilples UI Pruesses db Uliler dllu eruulle . Drag the appropriate items to their respective bins. Reset Help Photosynthesis, which converts carbon dioxide and water into glucose and oxygen. The reaction in an instant cold pack. Any combustion reaction, such as propane burning in a gas grill, alcohol burning in a flaming dessert, or burning wood in a fireplace. Snow melting on a spring day. Reacting an acid and a base, such as HCl with NaOH solutions. Liquid water freezing on a cold winter day exothermic endothermic

Answer 1

Exothermic	Endothermic
Reacting an acid and base , such as HCl with NaOH solutions. Liquid water freezing on a cold winter day. Any combustion reaction such as propane burning in a gas grill, alcohol burning in a flamming dessert or burning wood in fire place	Photosynthesis which converts carbon dioxide and water into glucose and oxygen. The reaction in instant cold pack. Snow melting on a spring day.

$\Rightarrow$ Neutralization reaction always release heat , hence they are exothermic.

Combustion reactions always release heat , hence they are exothermic.

When phase of matter changes from Gas $\rightarrow$ liquid $\rightarrow$ solid , energy is released.

When phase of matter changes from solid $\rightarrow$ liquid $\rightarrow$ gas , energy is absorbed.

Therefore, Liquid water freezing on a cold winter day is exothermic process.

$\Rightarrow$ Photosynthesis reaction are possible only by absorption of sun light , hence it is endothermic reaction.

Reaction in instant cold pack : Cold pack contain two bags, one contain ammonium nitrate & other contain water. When bag of water is broken , solid ammonium nitrate dissolves in water by absorbing energy. due to this temperature of solution decreases. Hence, this is endothermic reaction.

Melting of snow is endothermic process as phase changes from solid to liquid.