Calculate the bond energies for the average Ca-O bonds in each phase. b. Based on this, which phase forms at low T&P and which at higher (Give a full explanation as to why and how your argument connects to part a)? c. What is the coordination number of Ca in calcite? And in aragonite? How does this answer relate to a&b?
Calculate the bond energies for the average Ca-O bonds in each phase. b. Based on this, which phase forms at low T&P and which at higher (Give a full explanation as to why and how your argument connects to part a)? c. What is the coordination number of Ca in calcite? And in aragonite? How does this answer relate to a&b?
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
Related questions
Question
Aragonite (a common biological product) and calcite (a common soil and sediment
mineral) are polymorphs of the formula CaCO3. The former has an average Ca-O bond
length of ≈ 2.5Å and the later has one of ≈3.2Å. Let’s assume the same born constant of 9
for both phases and a Madelung constant for Aragonite of 2.5 and for Calcite of 1.74.
a. Calculate the bond energies for the average Ca-O bonds in each phase.
b. Based on this, which phase forms at low T&P and which at higher (Give a full
explanation as to why and how your argument connects to part a)?
c. What is the coordination number of Ca in calcite? And in aragonite? How does
this answer relate to a&b?
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