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What is the second most common metal on Earth, and the most widely-used metal?
Chemistry
What is the second most common metal on Earth, and the most widely-used metal?
Aluminiumâ€
Silicon
Calcium
Iron
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Which of the following is an element?
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In which emission is the most mass lost?
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How many elements with atomic number below 100 have their symbols starting with an upper case T?
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What chemical substance is abbreviated CO2?
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What compounds that are soluble in water are classed as bases?
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What kind of cell has a negative EMF and a positive Gibbs free energy?
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Heavy water contains what isotopic form of hydrogen?
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What element gets its name from the Greek word "kryptos" meaning "the hidden one"?
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