1) Which of the following is considered a noncovalent bond? A) Electrostatic int

Question

1) Which of the following is considered a noncovalent bond? A) Electrostatic interactions B) Hydrogen bonds C) Van der Waals interactions D) All of the above E) None of the above 2) The First Law of Thermodynamics states that: a) The total energy of a system and its surroundings is constant b) The total energy of a system changes while its surrounding remains constant c) The total energy of a system and its surrounding increases for a spontaneous reaction d) A system and its surrounding cannot absorb or release energy Which of the following is true for hydrogen bond? 3) A) The attraction between the oxygen atom of a water molecule and hydrogen atonm of another molecule constitutes hydrogen bond B) Hydrogen bonds form as covalent bonds between positively and negatively charged ions C) Hydrogen bonds form between nonpolar portions of biomolecules D) A and B are true E) A, B and C are true 4) Which is the following is true of PH a) PH is the negative logarithm of [OH) b) Lemon juice which has a PH of 2.0, is 60 times more acidic than ammonia, which has a PH of 12 c) Varying the PH of a solution will alter its Pka of an ionizable group in that solution d) Varying the PH of a solution will alter the degree of ionization of an ionizable group in that solution e) All of above are true

Explanation / Answer

Ans. 1 option(d) all of the above

Hydrogen bonds, van der waal and electrostatic interactions all are included in noncovalent bonds

Ans. 2 option (s)

Total energy of universe (system and surrounding) remains constant.

Ans. 3 option (c) A and B are true

Ans. 4 option (d) is true

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