Module 4 Solid phase chem

Question 1

Define Sesquioxides

Answer 1

secondary mineral usually contianing O2, OH- or OOH-

Question 2

What minerals are often colorful?

Answer 2

iron

Question 3

Ferrous iron

Answer 3

Fe^2+

Question 4

Ferric iron

Answer 4

Fe3+

Question 5

How many oxidation states does Fe have?

Answer 5

2

Question 6

Fe is a plant (micro/macro) nutrient

Answer 6

micro

Question 7

Describe Goethite

Answer 7

yellowish brown most common Fe oxide

Question 8

Describe Lepidocrocite

Answer 8

Orange to reddish brown found in seasonally anaerobic soils in temperate climates

Question 9

Describe Ferrihydrite

Answer 9

Orange ish difficult to detect due to short range order

Question 10

Describe Hematite

Answer 10

Red to purple found in warm tropics in aerobic soil

Question 11

Describe Maghemite

Answer 11

Reddish brown found in highly weathered soils from mafic parent material

Question 12

Describe Magntite

Answer 12

Black inherited from parent materials

Question 13

Green rusts

Answer 13

Green to Blue mostly Fe2+ permanently saturated poorly drained soils

Question 14

Mn aids in decomposition of

Answer 14

Ligin

Question 15

Birnessite

Answer 15

in young soils, most common Mn oxide

Question 16

Vernadite

Answer 16

Mno2 layers and tunnels structure