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Chemistry | Definition, Topics, Types, History, Facts | Britannica Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization Today, vinyl, Teflon, liquid crystals, semiconductors, and superconductors represent the fruits of chemical technology
Cellular respiration | Definition, Equation, Cycle, Process, Reactants . . . Cellular respiration, the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining activities and discarding, as waste products, carbon dioxide and water
Chemical industry | Overview, Importance, History | Britannica Chemical industry, complex of processes, operations, and organizations engaged in the manufacture of chemicals and their derivatives Raw materials include fossil fuels and inorganic chemicals
Hydrogen | Properties, Uses, Facts | Britannica The earliest known important chemical property of hydrogen is that it burns with oxygen to form water, H 2 O; indeed, the name hydrogen is derived from Greek words meaning “maker of water ”
Boron | Properties, Uses, Facts | Britannica Boron, chemical element that is a semimetal essential to plant growth and of wide industrial application Typical effects of long-term boron deficiency are stunted, misshapen growth; vegetable ‘brown heart’ and sugar beet ‘dry rot’ are among the disorders due to boron deficiency
Lead | Definition, Uses, Properties, Facts | Britannica What is lead as a chemical element? What does lead look like and what is its symbol on the periodic table? Where is lead found in nature? What are some uses of lead in everyday life?
Periodic table | Definition, Elements, Names, Symbols, Groups, Charges . . . Periodic table, in chemistry, is an organized array of all the chemical elements in order of increasing atomic number When the elements are thus arranged, there is a recurring pattern in which elements in the same column (group) have similar properties