Chemistry

The red color of rubies is caused mainly by the presence of what element?

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Which metal contains 60% copper and 40% zinc?
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What will happen to a bowl of ice cream left in the sun?
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What is the third most abundant gas in the earth's atmosphere?
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Lutetium on the periodic table is noted by which symbol?
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What kind of crystalline solid is a grain of sand?
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What is added to salt to prevent thyroid disease?
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What is the smallest part of matter called?
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How many more times acidic is a solution of pOH 5 than a solution of pH 5?
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