16) The data below were determined for the reaction shown below. Expt.B [S:01 0.

Question

16) The data below were determined for the reaction shown below. Expt.B [S:01 0.038 0.076 0.076 11-1 0.060 0.060 0.030 14 10M/s 2.8 x 10 Ms 1.4×10-sMis The rate law for this reaction must be: A) rate k[S 0I1 C) rate-S B) rate kIS01 D) rate kI 17) Which one of the following changes would alter the rate constant (k) for the reaction 2A + B products? A) increasing the concentration of A B) increasing the concentration of B C) increasing the temperature D) measuring k again after the reaction has run for a while 18) Which one of the following combinations cannot function as a buffer solution? A) HCN and KCN C) HNOs and NaNO B) HNO2 and NaNO D) HF and NaF 19) What is the net ionic equation for the reaction that occurs when small amounts of hydrochloric acid are added to a HOC/NaOCI buffer solution? A) H+ + H2O H30" D) H.HOCI HsOCi. 20) The molar solubility of magnesium carbonate (MgCO) is 1.8 × 104 mon-what is K, for this compound? A) 1.8 x 10 B) 3.6x 104 C) 1.3 x 10D) 3.2 x 10 21) Which of the following would decrease the Kap for Pblz? A) Lowering the pH of the solution B) Adding a solution of Pb(NO3)2 C) Adding a solution of KI D) None of the above-the Ksp of a compound is constant at constant temperature 22) Which of these species would you expect to have the highest standard entropy (S9y? C) CH(g) A) CH(8) B) C2H:(8)

Explanation / Answer

17. Rate Constant depends upon Temperature. it does not depend upon the concentrations of reactants.

Hence our answer will be-

(C) increasing the temperature will change rate constant (k).

18. For a Buffer solution it must have -

1. Weak acid and it's conjugate base.

or

2. Weak base and it's conjugate acid.

In our options HNO3 and NaNO3 both are strong acids, hence they can not create buffer solution.

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