Chemistry

Which of these chemicals is often used to reduce phosphates in water?

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How many electrons are in the third ring of the atom Chlorine?
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What is the oxidation number on the chromium in a dichromate ion "(Cr2O7)^2-"?
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What alkali metal is used in batteries and certain medicines?
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What is the symbol used on the periodic table for the element Fluorine?
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Which of the following is the symbol for Iron?
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What is the half-life of Rubidium-Strontium 87?
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Which of the following is not a heavy metal?
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Which of these is an element?
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