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What is the valency of carbon that makes it the basis of organic chemistry?
What is the chemical formula for ammonia?
Which type of chemical reaction involves a substance combining with oxygen to release energy?
Which element is a liquid at room temperature and is used in thermometers?
What is the lightest element in the periodic table?
What is the chemical formula for glucose, the primary energy source for cells?
Which process separates a mixture of liquids based on their different boiling points?
What is the name of the process by which a liquid changes to a gas at its boiling point?
What is the name of the horizontal rows in the periodic table?
Which particle determines the chemical properties of an element?