a student adds water to a substance X taken in beaker. He feels the beaker turning hot and a hissing sound is produced. Why does this happen? Write a chemical equation for the reaction. State the type of this reaction.
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16
Answer:
X is a compound of base and acid solids. as they react with water and dissolve in it slowly, for neutralization, it produces hydrogen gas creating bubbles and this bubbles creates the sound.
the reaction is exo-thermal displacement reaction as it produces heat
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Answered by
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calcium oxide reacts with H20 to form calcium hydroxide , liberating a large amount of heat . This makes the beaker warm. The substance X , is therefore calcium oxide
CaO + H2O ----------> Ca(OH)2 + Heat
It is a combination and exothermic reaction
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