Endothermic process
Some chemical reactions take heat from their surroundings and store it as chemical energy.
Those are are called endothermic reactions.
When endothermic reaction takes place temperature decreases.
The word equation between sodium hydrogencarbonate and citric acid
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Sodium hydrogencarbonate + citric acid -> Sodium citric + water + carbon dioxide
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The reactants are citric acid and sodium hydrogen carbonate (also known as sodium bicarbonate or baking soda). When these two substances are combined, they react to form the products of sodium citrate, water, and carbon dioxide gas.
The products of the reaction between sodium hydrogen carbonate and citric acid are sodium citrate, water, and carbon dioxide.
Eating sherbet sweets makes your mouth feel cooler because the dry ingredients, citric acid and sodium hydrogen carbonate, react when they dissolve in your saliva, causing an endothermic reaction.
The fizzing feeling from sherbet comes from a chemical reaction between citric acid and sodium bicarbonate when they dissolve in saliva.
Ice melting is an endothermic process because it is a physical change (solid to liquid) that absorbs energy without changing the chemical composition of the substance. In contrast, an endothermic reaction involves a chemical change where new substances are formed, requiring an input of energy to break chemical bonds.
Melting, evaporation, and sublimation are endothermic processes, meaning they absorb energy from their surroundings.
Water freezing is an exothermic process because it releases heat energy into the surroundings.