Chemistry

What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?

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What is the chemical combination of silicon and oxygen called?
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What does the pH scale usually range from?
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Ethyl pentanoate would be classified as belonging to which derivative group?
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Acetone is present in which of the following products?
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How many pounds of carbon dioxide are produced when a car burns one gallon of gas?
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Who discovered calcium and barium?
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What is deterioration of a metal by chemical or electrochemical reaction with its environment?
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What does the word "oxygen" mean?
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