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| Base your answers to questions 69 through 71 on the information below. At standard pressure, hydrogen peroxide, H2O2, melts at -0.4°C. boils at 151°C, and is very soluble in water. A bottle of aqueous hydrogen peroxide, H2O (aq), purchased from a pharmacy has a pressure-releasing cap. Aqueous hydrogen peroxide decomposes at room temperature, as represented by the balanced equation below.2H2O2(aq) ==> 2H2O(l) + O2(g) + 196.0 kJ69 State. in terms of both melting point and boiling point, why H2O2 is a liquid at room temperature. [1]Highlight box to reveal answer room temperature is above the melting point and below the boiling point of H2O2 |
70 State evidence that indicates the decomposition of H2O2(aq) is exothermic. [1]Highlight box to reveal answer Heat (energy) is a product of the reaction or more energy is released than absorbed |
71 Explain why a hydrogen peroxide bottle needs a pressure-releasing cap. [I] Highlight box to reveal answer As O2 is produced, the pressure inside the bottle increases and needs to be released |
on to Questions 72-75 |
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