Carbon
The major ingredient in tobacco that gets you addicted is nicotine.
Portland cement.
The common name of silicon carbide is carborundum.
The major ingredient in Marmite is yeast extract. This ingredient gives Marmite its distinctive savory flavor, which is either loved or hated by consumers.
Silicon is the major ingredient in flint, so I guess the answer is arrow heads and hand axes. It is also the major ingredient in ceramics (pottery) , glass and bricks.
Copper carbide is a salt. As the element implies, the ions present are copper ions and carbide ions. Carbide ions are made of carbon atoms.
Carbide drill bits are one of the best drill bits available. They don't appear to have major problems. They seem to drill better and have better power than some other types.
"Carbide" as used in "Carbide Drills" and "Carbide Saws" is the alloy Tungsten Carbide. Chemically the material is either Tungsten Carbide (WC) or Tungsten diCarbide (WC2). Carbide is used because of its hardness.
curry powder
water
Union Carbide was created in 1917.
This is calcium carbide - CaC2.