1 / 12

Unit 2 Section C.4

Composition of Materials. Unit 2 Section C.4. % Composition. percent composition: (def) percent by mass of each material found in an item Percent composition helps geologists describe how much metal or mineral is present in a particular ore .

val
Download Presentation

Unit 2 Section C.4

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Composition of Materials Unit 2Section C.4

  2. % Composition • percent composition: (def) percent by mass of each material found in an item • Percent composition helps geologists describe how much metal or mineral is present in a particular ore. • They can evaluate if the metal should even be mined.

  3. Common Copper-containing minerals • To calculate the % of Cu in each mineral: • mass of Cu in compound x 100 total mass of compound • Cu2S mass of Cu in compound: 63.55g x 2 = 127.1 g Cu total mass of compound: (63.55 g x 2) + 32.07 g = 159.17 g % Cu = (127.1g/159.17g) x 100 = 79.85% Cu

  4. Copper-containing minerals • CuFeS2 mass Cu: 63.55 g mass of compound: 63.55 g + 55.85 g + (32.07g x 2) = 183.54 g %Cu = 63.55 g Cu x 100 = 34.62% Cu 183.54 g compound

  5. Copper-Containing minerals • Cu2CO3(OH)2 mass Cu in compound: 63.55 g x 2 = 127.1 g Cu total mass of compound (63.55 g x 2) 12.01g (16.00g x 3) %Cu = 127.1 g Cu = 57.48% (16.00g x 2) 221.13 g total + (1.01 g x 2) 221.13 g

  6. Mining a Metal Ore • Two factors to consider when deciding whether it’s worthwhile to mine a particular ore: 1) percent of mineral in the ore 2) percent of metal in the mineral

  7. Picture to Relate % Metal in Ore Amount of Cu in ore containing 10% chalcocite (Cu2S)

  8. Percent Comp. Practice • Ag2S • Al2O3

  9. Practice Problems • CaCO3

  10. Practice Problems • A 50.0-gram sample of ore contains 5.00g of lead(III)sulfate, PbSO4 • a) What is the % metal in PbSO4? • b) What is the percent PbSO4 in the ore?

  11. Practice Problems • A 50.0-gram sample of ore contains 5.00g of lead(III)sulfate, PbSO4 • c) What is the percent Pb in the total ore sample?

  12. Practice Problems • Which mineral would be most profitable to mine for chromium? • FeCr2O4, PbCrO4, or Cr2O3

More Related