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Middle School Math
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Ratios
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1.  Hornblende is a dark mineral found in many igneous rocks. It has the general chemical formula Ca2Al2Mg2Fe3Si6O22(OH)2. If in a particular crystal of hornblende there are2.2million iron atoms, how many aluminum atoms should there be? Round your answer to the nearest hundredth.

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3.  Soils around the world vary in their organic matter content. Organic matter comes from living things or things that used to be alive. For example, in comparing a soil from Nebraska to one from Arizona, it would not be unusual for the Nebraska soil to have a greater amount of organic matter by a factor of5to1. If you had two such samples and the sample from Arizona contained7g of organic matter, how many grams of organic matter would there be in Nebraska soil of equal mass? Round your answer to the nearest hundredth.

4.  The lava output from the volcano in crater park has quadrupled over the past30days. If the lava output30days ago was4tons of rock per week, what is the output now?

5.  Based on what has been found so far, the ratio of fossil floopasaurs to fossil bloopia in Africa is3to1. If this ratio is later discovered to have an error of50% (too high) for floopasaurs, what would the corrected ratio be?

6.  A soil sample from near a factory is analyzed to see if it is polluted. In one test,19g of soil was dried to remove water. After drying,77% of the original mass remained. An elemental analysis was performed and the soil was found to be30% carbon,21% oxygen,12% hydrogen, and the rest was ash. Ash contains minerals and other difficult to decompose matter. Assuming all the ash was the result of soil minerals, how many grams of minerals was in the original soil sample? Round your answer to the nearest hundredth.



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Ratios
Mathématiques
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