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題目

解題步驟

1. Understand the question
   1. which of the following is a native element?a. saltb. coalc. copperd. steel7. which is the least useful property for identifying minerals?a. densityb. colorc. lusterd. crystal shape8. according to the table below, which of the following minerals is white in the powdered form?a. augiteb. garnetc. magnetited. pyrite9. according to the table below, which of the following minerals is the softest?a. sphaleriteb. garnetc. magnetited. pyriteproperties of minerals| mineral | hardness | streak | color | luster || ---- | ---- | ---- | ---- | ---- || augite | 5-6 | greenish-gray | green to black | nonmetallic || garnet | 6.5-7.5 | white | dark red | nonmetallic || magnetite | 5-6 | black | iron black | metallic || pyrite | 6-6.5 | green to black | brass yellow | metallic || sphalerite | 3.5 | reddish-brown | brown to black | nonmetallic |10. the easiest property of a mineral to observe is its...a. cleavageb. hardnessc. crystal shaped. color
2. Brief Explanations
   1. A native element occurs naturally in pure form. Copper is a pure native element; salt is a compound, coal is organic matter, steel is an alloy.
   2. Color can vary for the same mineral due to impurities, making it the least reliable identification property.
   3. Streak is the color of a mineral's powder. The table shows garnet has a white streak.
   4. Hardness is measured on the Mohs scale; the lowest value in the table is 3.5 for sphalerite, making it the softest.
   5. Color is immediately visible without testing tools, so it is the easiest property to observe.
3. Final answer
   1. c. Copper
   2. b. Color
   3. b. Garnet
   4. a. Sphalerite
   5. d. Color

答案

Question Analysis

OCR Text

6. which of the following is a native element?a. saltb. coalc. copperd. steel7. which is the least useful property for identifying minerals?a. densityb. colorc. lusterd. crystal shape8. according to the table below, which of the following minerals is white in the powdered form?a. augiteb. garnetc. magnetited. pyrite9. according to the table below, which of the following minerals is the softest?a. sphaleriteb. garnetc. magnetited. pyriteproperties of minerals| mineral | hardness | streak | color | luster || ---- | ---- | ---- | ---- | ---- || augite | 5-6 | greenish-gray | green to black | nonmetallic || garnet | 6.5-7.5 | white | dark red | nonmetallic || magnetite | 5-6 | black | iron black | metallic || pyrite | 6-6.5 | green to black | brass yellow | metallic || sphalerite | 3.5 | reddish-brown | brown to black | nonmetallic |10. the easiest property of a mineral to observe is its...a. cleavageb. hardnessc. crystal shaped. color

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