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

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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

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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