36) The minimum collision energy needed for a reaction to happen is called A. th

Question

36) The minimum collision energy needed for a reaction to happen is called A. the transition state. B. the Gibbs free energy. C the activation energy. D. the enthalpy change. 37) Which of the following is amphoteries A. CH B. HPO C. H2SO D. NH 38) Which of the following ions undergoes hydrolysis A. NO B. CI C. F D. CIO4 pe iMg can react with an alpha particle to produce !H and what other isotope? 39) The radioisoto A. AI B. Mg D. Ar 40) The second law of thermodynamics states that A. the absolute entropy of a pure crystalline substance at 0 Kelvin is 0 J/K. B. energy is always conserved during a chemical reaction. C. all spontaneous processes result in an increase in disorder of the universe. D. the free energy change of a reaction can be calculated using standard free energies of formation.

Explanation / Answer

36)

This minimum energy is called activation energy. This much energy must be possessed by reactants for reaction to take place

Answer: C

37)

CH4 can act as acid by donation H+

HPO42- can donate H+ and form PO43-

HPO42- can accepts H+ and form H2PO4-

Hence HPO42- can be amphoteric

H2SO4 can donate H+ and can act as acid

NH4+ can donate H+ and can act as acid

Answer: B

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