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Bikkurim (Hebrew: בכורים, / b ɪ ˌ k uː ˈ r iː m, b ɪ ˈ k ʊər ɪ m /), [1] or first-fruits, are a type of sacrificial offering which was offered by ancient Israelites. In each agricultural season, the first-grown fruits were brought to the Temple and laid by the altar, and a special declaration recited.
A discordant coastline occurs where bands of different rock types run perpendicular to the coast. [1] The differing resistance to erosion leads to the formation of headlands and bays. A hard rock type such as granite is resistant to erosion and creates a promontory whilst a softer rock type such as the clays of Bagshot Beds is easily eroded ...
Copper chromite is produced through the exposure of copper ammonium chromate to temperatures of 350-450 °C: Cu(NH 4) 2 (CrO 4) 2 → CrCuO 3 + CrO + 4 H 2 O + N 2. An active copper chromite catalyst which includes barium in its structure can be prepared from a solution containing barium nitrate, copper(II) nitrate, and ammonium chromate. When ...
Chromite is a crystalline mineral composed primarily of iron(II) oxide and chromium(III) oxide compounds. It can be represented by the chemical formula of Fe Cr 2 O 4 . It is an oxide mineral belonging to the spinel group .
The chromite ore is heated with a mixture of calcium carbonate and sodium carbonate in the presence of air. The chromium is oxidized to the hexavalent form, while the iron forms the stable Fe 2 O 3 . The subsequent leaching at higher elevated temperatures dissolves the chromates and leaves the insoluble iron oxide.
Over 80% of the world's ferrochrome is utilised in the production of stainless steel. In 2006, 28,000,000 tons of stainless steel were produced. [3] [4] Stainless steel depends on chromium for its appearance and resistance to corrosion. Average chrome content in stainless steel is approx. 18%. It is also used to add chromium to carbon steel ...
Potassium dichromate, K 2 Cr 2 O 7, is a common inorganic chemical reagent, most commonly used as an oxidizing agent in various laboratory and industrial applications. As with all hexavalent chromium compounds, it is acutely and chronically harmful to health.
Freshwater Bay, Isle of Wight is an example of an area of concordant coastline - the town of Freshwater is situated on a cove which formed in the hard chalk coastline.. In coastal geography, a concordant, longitudinal, or Pacific type coastline occurs where beds, or layers, of differing rock types are folded into ridges that run parallel to the coast. [1]