Qui manquent dans le bécher du premier dessin. Exercice 4 : Dans une pile à hydrogène (pour faire fonctionner une voiture à hydrogène), c'est la combustion du
dihydrogène qui permet de produire l'électricité
Le dihydrogène réagit avec le dioxygène de l'air pour former de l'eau, de la chaleur et de l'électricité.
a) Quels sont les réactifs nécessaire au fonctionnement d'une voiture à hydrogène ?
b) Quel est le produit généré ?
d) La masse du produit est-elle égale à la somme des masses des 2 réactifs ?
c) Écris l'équation de la réaction (en l'équilibrant).
Yours
Comment y est forme l'univers
Recopier le reste en completant les parintilles
Lil
treise milliands d années au
bria​

Identify a specific example for each type of technology

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds