1) Reacting molecules or ions in a solution at room temperature are in constant
ID: 633845 • Letter: 1
Question
1) Reacting molecules or ions in a solution at room temperature are in constant motion and collide. Some collisions lead to a formation of product and some do not. What determines whether a reaction will take place?
2) The decomposition of hydrogen peroxide (H2O2), yields water and oxygen gas: A) Write a balanced equation for this decomposition reaction. B) The reaction is fast with the addition of manganese dioxide (MnO2). Should this chemical appear in the balanced equation? What is the purpose of the manganese dioxide? C) The temperature of a reaction was increased from 20 to 40deg. Celsius. You were determining the rate of reaction at each of the two temperatures. The second reaction should be faster by how much?
Explanation / Answer
1)A chemical reaction takes place only when the reacting molecules collide. However, not all collisions are effective in causing the reaction. Products are formed only when the colliding molecules possess a certain minimum energy called threshold energy.
2) A).2H2O2 ---> 2H2O + O2
B). Mangenese oxide is the catalyst for the decomposition of hydrogen peroxide and is not consumed in the reaction.
C).When heat is added to a reaction, the molecules involved in the reaction are given more energy and therefore move about the solution quicker. This then increases the chances of two different molecules colliding with each other and reacting, therefore increasing the reaction rate.
The second reaction is fasterby
k(2) = k(1)*e^[(Ea)*0.00022/R]
according to Arrhenius equation
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