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Bonjour pouvez vous m’aider !! C’est un dm à rendre pour demain j’ai vraiment besoin d’aide merci d’avance !

15
Artificial snow
| Pratiquer une langue vivante étrangère.
Some ski resorts use snow
cannons to make artificial
snow. The method consists of
spraying, in the air, a mixture
of water and pressurized air
at a temperature close to 0°C.
The fan separates the droplets
of water to decrease their size.
When blowing the mixture
into the air close to -2 °C, the
water turns into ice.
1. Name this transformation.
2. Does the water receive or release energy? Justify.

Répondre :

1. The transformation described is known as the freezing or solidification of water.

2. In this transformation, the water releases energy. When water freezes, it undergoes a phase change from liquid to solid. This process releases latent heat, which is the energy that was originally absorbed by the water during its melting process. When water melts, it absorbs energy from the surroundings to overcome the intermolecular forces holding its molecules together. Conversely, when water freezes, it releases this stored energy back into the surroundings as heat. Therefore, the freezing process is exothermic, meaning it releases energy to its surroundings.

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