The fracture toughness of the polymer should be determined. Concept introduction: Fracture toughness can be calculated as: k I C = f σ π a Where, f = g e o m e t r y f a c t o r o f f l a w a n d s p e c i m e n σ = s t r e s s a p p l i e d a = f l a w s i z e ( h a v e c r a c k l e n g t h ) k I C = f r a c t u r e t o u g h n e s s .

Question

1. Zinc is an important trace nutrient for photosynthetic organisms (e.g., phytoplankton) in sea water. Calculate the speciation of zinc (Zn(II)) in seawater assuming Zn(II) TOT = 5 x 10-8 M. Provide a list of the metal-ligand complexes and their corresponding stability Constants that you will include in your calculation. If you decide to exclude any of the complexes for which stability constants are provided in Table 9.4, please list these separately and explain your rationale. b. Compute the concentrations of the metal-ligand complexes identified in part a. c. Compute the activities of the metal-ligand complexes using the concentrations calculated in part b and using the data in Table 9.6B to calculate the activity coefficients. (Note—you likely already have a spreadsheet where you calculated activity coefficients from week 3!)

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Chapter 7, Problem 7.8P

Interpretation Introduction

Interpretation:

The fracture toughness of the polymer should be determined.

Concept introduction:

Fracture toughness can be calculated as:

kIC=fσπa

Where,

f= geometry factor of flaw and specimenσ=stress applieda= flaw size ( have crack length)k IC=fracture toughness.

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