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Which of the following best characterizes ferromagnesian silicates? 

  1. They are black to dark-green, silicate minerals containing iron and magnesium. 

  2. They are mostly clear, colorless, and rich in the elements magnesium and ferrium. 

  3. They contain magnetite and ferroite, and they are clear to light green. 

  4. They contain iron and magnetite, are black in color, and they have metallic lusters.

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Trizzia Michelle Tiwaquen
Trizzia Michelle TiwaquenLv7
28 Dec 2020

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Related questions

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Substances X2, Y2, and Z2 can all act as oxidizing agents (analogous to Cl2, Br2, and I2). In solution X2 is green, Y2 is yellow, and Z2 is red. In the reactions in which they participate, they are reduced to 2X–, 2Y–, and 2Z– ions, all of which are colorless. A solution of X2 is mixed with one containing Y– ions. The color of the mixed solution changes from green to yellow.

a. Write the balanced, net equation for the reaction.

b. Which species is oxidized? (either X2, X–, Y2 or Y–)

c. Which species is the oxidizing agent?

d. Identify the stronger oxidizing agent, X2 or Y2, and briefly explain your reasoning

e. It is also determined in another experiment that Z2 is a weaker oxidizing agent than Y2. Which one statement below best describes what you would observe if you mix X2 with Z–? Briefly explain your choice.

i. The green mixture would change to red as Z2 is formed.

ii. The green mixture would not change as X2 will not react.

iii. The color change cannot be predicted with the information given.

Chlorophyll molecules are the most abundant pigments in plants that are responsible for collecting light for photosynthesis. Which of the following statements is not true?

1) The two main forms of chlorophyll are chlorophyll a and b.
2) These molecules resemble the protoporphyrins in hemoglobin and myoglobin, except these contain Fe+2 rather than Mg+2.
3) They require the presence of accessory pigments such as beta-carotene and lutein in order to function.
4) They absorb light in the blue and red region of the visible spectrum, which is why they appear green.

a) Statements 1, 2, and 4 are true

b) Statements 2, 3, and 4 are true.

c) Statements 1, 2, and 3 are true.

d) All of the listed statements are true.

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