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Percents
Math
Middle School Math

 

Name _____________________________
Date ___________________
Percents
Complete.

1.   A sample of ore is found to be 0.0042% gold and 0.069% silver. What is the percent of matter in the ore that is neither gold nor silver?

2.   A sample of clay is found in Mongolia that contains aluminum, silicon, hydrogen, magnesium, iron, and oxygen. The amount of iron is equal to the amount of aluminum. If the clay is 25% silicon, 14% hydrogen, 8% magnesium and 19% oxygen, what is the percent iron?

3.   What is the concentration (in %) of a solution of 500 ml of water that has 7 grams of barium chloride dissolved in it? Round your answer to the nearest hundredth of a percent if needed.

4.   Savannah is concentrating a sample by distillation. She started with 80 ml of a solution that was about 0.13% inorganic salts. After several hours of distillation the amount of inorganics salts hasn't changed, but the volume had been decreased to 39 ml. What percent of the solution after distillation is inorganic salts? Round your answer to the nearest hundredth of a percent.

5.   * This is a pre-made sheet.
Use the link at the top of the page for a printable page.
6.   A cold saturated solution of magnesium ferrocyanide contains 33 grams of the salt per 100 ml. If you have a solution that contains 18 g of magnesium ferrocyanide per 150 ml, how close is it to being saturated? Express your answer as a percent rounded to the nearest whole number.


 


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Percents
Math
Middle School Math