Chemical reactions occur when molecules or atoms collide so that the bonds betwe
ID: 1034704 • Letter: C
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 perature decreases the kinetic energy of the reactants, and the reaction goes Decreasing the tem more slowly Increasing the concentration of reactants increases the number of collisions, and the reaction goes faster. If the heat of reaction, AH, is positive, the energy of the products is lower than the energy of the reactants and the reaction is endothermic. Reactants must collide, with proper orientation and with energy greater than or equal to the activation energy for a reaction to occur 1 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, Ea, for bonds to be broken. The activation energy, Ea, of the forward reaction is the difference between the energy of the products and the energy of the transition state.Explanation / Answer
Sol:-
1) True, because decreases in temperature decreases the number of effective collisions which brings a chemical reaction in forward direction and number of effective collisions increases with increase the kinetic energy of reacting species.
2)True, increases the concentration of reactants increases the chances of no. of effective collisions and therefore rate of reaction also increases.
3) False , ?H = H( products) - H( reactants)
Therefore , ?H must be - ve for given conditions and therefore reaction will be exothermic not endothermic.
4)True, proper orientation of reacting species required to increase the rate of reaction.
5) False, because when activation energy decrease, rate of reaction increases.
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