Dec 26, 2025 · Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization. Today, vinyl, Teflon, liquid crystals, semiconductors, and …

Dec 16, 2025 · All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.

CHEMICAL meaning: 1 : of or relating to chemistry; 2 : working by means of chemicals

Dec 22, 2025 · 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 …

Jan 9, 2026 · 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; …

Jan 9, 2026 · Cellular respiration, the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining activities and …

Jan 7, 2026 · Silver, chemical element of atomic number 47, a white lustrous metal valued for its decorative beauty and electrical conductivity. Silver’s physical and chemical properties are …

Nov 21, 2025 · And the term environment includes not only physical and chemical features but also the biological environment, which involves yet more organisms. In practice, ecology is composed of …

Dec 31, 2025 · Protein enzymes catalyze the vast majority of chemical reactions that occur in the cell. Proteins provide many of the structural elements of a cell, and they help to bind cells together into …

The substances in a chemical reaction may be chemical elements, molecules, or compounds. The substances present at the start of a chemical reaction are called the reactants; the substances …