Приведите примеры использования катализаторов

1)He asked me what i had bought the day before 2)Mary said that she was tired that day3)My nephew said that he eat only twice a day 4)Mr Longer asked the secretary if he/she was busy

1)He asked me what I had bought the day before.2)Mary said that she was tired that day.3)My nephew said that she ate only twice a day.4) Mr. Longer asked the secretary if he was busy.

Катализа́тор — химическое вещество, ускоряющее реакцию, но не входящее в состав продуктов реакции.             t, MnO₂2KCIO₃ →→→→2KCI + 3O₂  (катализатор MnO₂)                H₂O 2AI + 3I₂→→→→ 2AII₃ (катализатор вода)                 MnO₂2H₂O₂→→→→2H₂O +O₂ (катализатор MnO₂)                   V₂O₅2SO₂ + O₂ →→→→ 2SO₃ (катализатор V₂O₅)