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Hydrochloric acid has been used for dissolving calcium carbonate, e.g. such things as de-scaling kettles and for cleaning mortar off brickwork. When used on brickwork the reaction with the mortar only continues until the acid has all been converted, producing calcium chloride , carbon dioxide , and water:
420, 4:20 or 4/20 (pronounced four-twenty) is cannabis culture slang for marijuana and hashish consumption, especially smoking around the time 4:20 p.m. (16:20). It also refers to cannabis -oriented celebrations that take place annually on April 20 (4/20 in U.S. date form).
The word retail comes from the Old French verb retaillier, meaning "to shape by cutting" (c. 1365).It was first recorded as a noun in 1433 with the meaning of "a sale in small quantities" from the Middle French verb retailler meaning "a piece cut off, shred, scrap, paring". [1]
The part of today's Lazio south of the Tiber river – together with the present region of Campania immediately to the southeast of Lazio and the seat of Neapolis – became Region I (Latium et Campania), while modern Upper Lazio became part of Regio VII – Etruria, and today's Province of Rieti joined Regio IV – Samnium.
Plasma or serum concentrations are usually in a range of 0.1-1.6 mg/L during therapy and 6–20 mg/L in cases of clinical intoxication, while blood levels of 20–100 mg/L have been observed in deaths due to acute overdosage. [29]
A semiconductor is a material that is between the conductor and insulator in ability to conduct electical current. [1] In many cases their conducting properties may be altered in useful ways by introducing impurities ("doping") into the crystal structure.