Instructions: Choose the best answer for the following questions.
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The silicates are the most common minerals in the Earth.
Select one:a. True
b. False
Question 2
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What is a silicon-oxygen tetrahedron?
Select one:a. An oxygen surrounded by four silicon
b. A silicon surrounded by four oxygen
c. A silicon surrounded by two oxygen
d. An oxygen that can have a random amount of silicon attaching to it.
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What is a single-chain silicate?
Select one:a. Silicon-oxygen tetrahedrons that are connected in a chain due to oxygen bonding to other oxygen.
b. Silicon-oxygen tetrahedrons that are connected in a chain because they are sharing oxygen.
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Part II – Silicate Structures
Below are two silicate structures. Figure 1 is a single silicon oxygen tetrahedron. Figure 2 is a single chain silicate showing the tetrahedrons are sharing oxygen atoms in their structure to create a chain. Using these two images, answer the questions below.
[img width=”125″ height=”122″ alt=”tetra5″ src=”https://ilearn.sfsu.edu/ay1617/pluginfile.php/125818/question/questiontext/132931/5/27194/tetra5.jpg”>
FIGURE 1
[img width=”216″ height=”587″ alt=”tetra6″ src=”https://ilearn.sfsu.edu/ay1617/pluginfile.php/125818/question/questiontext/132931/5/27194/tetra6.jpg”> FIGURE 2
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Why are there more silicon relative to oxygen in Figure 2?
Select one:a. Figure 2 has more oxygen than figure 1
b. There are more silicon atoms in Figure 2 than in Figure 1
c. Polymerization has occurred in Figure 2, where the oxygen are being shared between tetrahedrons
d. In Figure 1, the oxygen are sharing with surrounding tetrahedrons
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Print out the two figures above onto a piece of paper. Draw an S on the oxygen that are being shared in the structure(s) above. Then draw a black dot onto the oxygen that are not being shared to represent the iron atom attaching to that oxygen. Once you have finished this, answer the following questions. (Note: when looking at the single chain, please note that there is an oxygen sitting on top of the silicon in addition to the three other oxygen next to the silicon.)
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How many iron cations were you able to draw in for the single silicon-oxygen tetrahedron (Figure 1)?
Select one:a. One
b. Two
c. Three
d. Four
e. Five
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What mineral does Figure 1 represent?
Select one:a. Quartz
b. Muscovite
c. Pyroxene
d. Olivine
e. Plagioclase Feldspar
Question 7
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Look at Figure 2. How many iron cations were you able to draw in for each silicon-oxygen tetrahedron (not the entire chain)? Choose a silicon-oxygen tetrahedron that is sitting in the middle of the chain, not the ends.
Select one:a. One
b. Two
c. Three
d. Four
e. Five
Question 8
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What mineral does Figure 2 represent?
Select one:a. Quartz
b. Muscovite
c. Pyroxene
d. Olivine
e. Plagioclase Feldspar
Question 9
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Which of the following minerals from the choices below share all oxygen in the silicate structure.
Select one:a. Quartz
b. Muscovite
c. Hornblende
d. Olivine
e. Pyroxene
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