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Chemistry
What is used to remove oxygen from cathode ray tubes and vacuum tubes?
Chemistry
What is used to remove oxygen from cathode ray tubes and vacuum tubes?
Strontium
Radium
Calcium
Barium
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In 2013, 140 countries signed the Minamata Treaty to protect people from what chemical element?
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What is the most commonly used material in the manufacturing of semiconductors?
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Why is sodium nitrate used in processed meats?
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Which of the following words mean "made stronger"?
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Which of the following is the symbol for Iron?
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What is adherence between materials such as bricks/mortar?
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What happens to water when it freezes?
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What element has an atomic number of 40?
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