Which of the following could properly represents the wnits for a second- on thos

Question

Which of the following could properly represents the wnits for a second- on those marked with a earn 1 peint atrs 2 Consider the following chemical react i kinetics study of this reaction shows that it takes 4.3 minutes for [R1 to drop from 0.100 M to 0050 M and it takes 8.6 minutes for [R] to drop from 0.050 M to 0.025 M. What is the order for R in ths react (a) First order (b) Zero order (e) Second order (d)Fourth order ion 2 P 3. Bimolecular reactions have special properties. Which of these statements is FALSE (a) All bimolecular reactions have two reactants (b) All bimolecular reactions have a rate law that is second order, overal (c) Bimolecular reactions are single-step reactions. (d) All bimolecular reactions begin by having one of the two fall apart. reactants (the energetically excited one) mations are used in chemistry problems to simplify the mathematics. Which of the approximations is invalid? followving (a) Ignoring the addition of rate-4.0 to rate, 14 in a kinetics steady state equation rater rater + rate (b) (c) Ignoring +x in this solublity equilibrium problem: Kp 22x10-1 30+ Ignoring -x in the denominator of this complex ion equilabrium problem 1 (0.30 +x)(4x) (d) Ignoring +x in the numerator of this equilibrium buffer problemc K Which of the following anions would be a common ion in a solution of hydrosulfuric acid? (a) s2- 42x10 5 (c) co Each of the following is added to separate 1.0-1L solutions of 0.30 M NaHSO3, Which addition will resaltin (b) 0.40 mol HCIos (b) HS (c) SO (d) so 6. a buffer solution? (a) 0.40 mol Na2SO3 (c) 0.40 mol NaOH (d) 0.40 mol H2SO4 7.S A 10.0 mL solution of 0.10 M H3PO4 is titrated with a 0.20 M NaOH solution. What volume of NaOH is (d) Unknown; Ka1 and Ka2 for HyPO, are needed to answer this question 8 Solid Fe(OH)2 is added to pure water and allowed time to form a saturated solution. The measured p required to reach the second equivalence point? (a) 5.0 mL (c) 15.0 mL (b) 10.0 mL the saturated solution is 9.19. If the pH of the solution is then adjusted to pH-8, will Fe(OHh precipit (a) Yes, because the (OH-1 at pH-8 is now above the concentration needed for super -aturation (b) Yes, because the (OH ] at pH 8 is beloto the concentration needed for super-saturation. (c) No, because the (OH-] at pH-8 is below the concentration needed for super-saturation. (d) No, because the (OH-]at pH 8 is now above the concentration needed for super-saturation

Explanation / Answer

Ans 1 : a) 1 / M.h

For the second order reactions , whose rate law is given as :

Rate = k[A]2

The concentration of A is given in M and rate is given in M / h

so the units of k = (M / h) x (M)-2

= 1 / M.h

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