Chemistry, 29.01.2022 14:00 Averybloemendaal
Here's how to identify a mineral. Luster is the way a mineral reflects light and the first key step in mineral identification. Look for luster on a fresh surface. The three major types of luster are metallic, glassy (vitreous), and dull. Next, try to determine the hardness of your mineral. Use the 10-point Mohs hardness scale. The important hardnesses are between 2 and 7. For this, you'll need your fingernail (hardness about 2), a coin (hardness 3), a knife or nail (hardness 6.5), and a few key minerals. Properties Color Luster Special Properties White Dull/glassy Bubbles with acid Pink or white Dull/pearly Black/gray Mineral Hardness (Scratch Test) 3 Calcite scratched by nail 6 Feldspar scratches glass 2 Mica scratched by fingernail 1 Talc easily scratched by fingernail 2 Gypsum scratched by fingernail 7 Quartz scratches glass Fluorite 4 Shiny Splits into thin sheets White Dull White/gray Dull Various colors Glassy Most common mineral Various colors Glassy Can be striped; multicolored Problem You have been given a gray mineral that can be scratched with a fingernail. Based on the identification criteria, what two minerals can you narrow your sample to?
A:Talc & Mica
B: gypsum & Talc
C:Mica and gypsum
D: Calcite &mica
Answers: 3
Chemistry, 21.06.2019 21:30
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Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4.0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.
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Chemistry, 22.06.2019 21:00
Read "who built the pyramids? ”. leave this link open while you answer the questions throughout the assignment. give at least two reasons why some people claim the pyramids of giza were constructed by aliens.
Answers: 1
Here's how to identify a mineral. Luster is the way a mineral reflects light and the first key step...
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