Which of the following is always necessary for a chemical reaction to occur betw

Question

Which of the following is always necessary for a chemical reaction to occur between two reactants, Which of the following is always necessary for a chemical reaction to occur between two reactants, A and B must be present in the same physical state. There must be equal amounts of A and B present. A and B must collide with sufficient energy and the proper orientation. The reaction must be carried out at room temperature. The reaction must be carried out at a temperature higher than room temperature. Which statement concerning energy changes in chemical reactions is flase? The breaking of bonds requires energy, and the formation of bonds releases energy. A reaction is exothermic if the products have a lower energy than the reactants. A reaction is endothermic if the reactants have a lower energy than the products. The overall energy change in a reaction is determined by the difference is energy between the products and the activated complex. Which of the following is false about the energy diagram shown? The activation energy is 100 k J. Point 2 on the diagram represents the activated complex. This reaction is exothermic. The energy of the products is lower than the energy of the reactants. Delta H = - 50 kJ. Which of the following statements concerning the reaction below is false? 2H_gO (s) rightarrow 2H_g(I) + O_2 (g) Delta H = 182 kJ. There is an increase in entropy in this reaction. This reaction is endothermic. 182 kJ of the energy are required for every two moles of HgO that react. The energy of the reactants is greater than the energy of the products. The system absorbs energy from the surrounding in this reaction.

Explanation / Answer

1. c) A and B must collide with sufficient energy and proper orientation.

2. option E is false. Overall energy change in reaction is determined by difference in the energy between product and reactants.

3.activation energy of reaction is 25KJ thus Option A is false.

4. The reaction is endothermic , thus energy of reactants should be lower than the energy of products.option d is false.

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