Jump Chemical reactions occur when molecules or atoms collide so that the bonds
ID: 1038167 • Letter: J
Question
Jump Chemical reactions occur when molecules or atoms collide so that the bonds between atoms break and new bonds form. Breaking the bonds of the reactants requires energy whereas, bond formation releases energy Select the statements regarding energy changes during a reaction that are true. The energy of a collision between atoms or molecules must be greater than or equal to the activation energy, Ea, for bonds to be broken. When the activation energy is low, the reaction rate is slow. Decreasing the temperature decreases the kinetic energy of the reactants, and the reaction goes If the heat of reaction, AH, is negative, the energy of the products is higher than the energy of the reactants and the reaction is exothermic. Reactants must collide, with proper orientation and with energy greater than or equal to the activation energy for a reaction to occur Increasing the concentration of reactants increases the number of collisions, and the reaction goes faster The activation energy, Ea, of the fonward reaction is the difference between the energy of the products and the energy of the transition state AnswerExplanation / Answer
1) True . For a reaction to occur even to start it must cross the activation energy barrier.
2) False. Low activation energy means the reaction requires less energy to get started . Not that it's rate is slow.
3)True . On decreasing the temperature rate if reaction decreases because average kinetic energy becomes low .
4)False. When the heat is release then energy of products is lower than the reactants . Reactants is converting to product by releasing energy that means product have less energy. The reaction is exothermic.
5)True. According to collision theory , not every collision result in reaction to occur. Reactants must combine with proper orientation and possess energy atleast equal to activation energy.
6)True . On increasing the concentration collision increases which increases the chance of collision with proper alignment and hence rate increases.
7)False , activation energy for forward reaction is the difference in energy of transition state and that of reactants.
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