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A 3% hydrogen peroxide solution, H2O2(aq), is commonly used as a disinfectant. Hydrogen peroxide, H2

NY Regents Chemistry Exam June 2022


A 3% hydrogen peroxide solution, H2O2(aq), is commonly used as a disinfectant. Hydrogen peroxide, H2O2, decomposes as represented by the balanced equation below. 2H2O2 → 2H2O + O2 + heat

74. State evidence, from the equation, that the reaction is exothermic. [1]


Explanation: An exothermic reaction is the one that releases heat. For an exothermic reaction, we would see heat on the product side of the equation.

Answer: Heat is on the product side.

75. Explain, in terms of substances, why the reaction is a decomposition reaction. [1]


Explanation: In a decomposition reaction one substance breaks down into multiple substances.

Answer: One substance reacts to become two different substances.


76. State how increasing the temperature of the H2O2 affects the rate of the reaction. [1]


Explanation: Increasing the temperature of the reaction should increase the rate of the reaction.



77. On the potential energy diagram in your answer booklet, draw a double-headed arrow (↕) to indicate the interval that represents the heat of reaction. [1]



Explanation: The heat of reaction is the difference in energy between reactants and products.


Answer:










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