本次代写是一个化学资源相关的Homework

Problem 1. Enrichment factor in Earth’s crust

This table was discussed in Lecture 1 (Ref. Revuelta Ch.1).

Estimate Enrichment Factor for the following critical elements – 5 points each [total 30 points]

  • PGMs (Platinum Group Metals) as a group or as Pt+Pd
  • Iridium,
  • Cesium
  • Tellurium
  • REEs as a group
  • Lithium

Notes:

Please be careful with info on internet. Try to use reliable sources

If you make assumptions, please record them.

Problem 2 – 10 points

He (Helium) is on the critical element list

  • Why?
  • What are the major applications for He?
  • What is the abundance or concentration of He on earth?
  • What is its primary resource for extraction?

NOTE: you can use USGS or any other information resource


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