Chemical reactions occur when molecules or atoms collide so that the bonds betwe

Question

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. Decreasing the temperature decreases the kinetic energy of the reactants, and the reaction goes must slowly. Reactants must collide, with proper orientation and with energy greater than or equal to the activation energy for a reaction to occur. lf the heat of reaction, delta H, is positive, the energy of the products is lower than the energy of the reactants and the reaction is exothermic. The activation energy, E_a, of the forward reaction is the difference between the energy of the products and the energy of the transition state. Increasing the concentration of reactants increases the number of collisions, and the reaction goes faster. When the activation energy is high, the reaction rate is fast. The energy of a collision between atoms or molecules must be greater than or equal to the activation energy, E_a, for bonds to be broken.

Explanation / Answer

Statement - 1,2,5,7 are true regarding a chemical reaction.

Statement -3,4,6 are false because

3- if H is positive then it is called exothermic reaction and energy of reactants are lower than energy of products.

4- activation energy for forward reaction is equal to the difference in energy of reactants and energy of transition state.

6- when activation energy is high the rate of reaction is slow

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