10. William aime boire son chocolat chaud à 68,0 °C. Il verse 180 mL de lait à 85,6 °C dans une tasse de 300 mL contenant de la poudre de cacao. Il ajoute du lait froid à 4,2 °C
à sa préparation pour l'amener à la température idéale. Quel volume de lait froid doit-il
ajouter à son chocolat chaud pour que la température du mélange soit idéale?
La masse volumique du lait est de 1,05 g/mL.

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.