WebApr 12, 2024 · Roman glass is well studied and known to have been produced from a mineral soda source and calcareous sand with variation between elements relating to naturally occurring minerals in the sands. While the common characteristics of colourants and opacifiers used in opaque and translucent glasses are well understood, the diverse … WebJun 30, 2024 · 30.06.2024 Chemistry Secondary School answered (a) Write chemical equations for the following reactions: (i) Calcium metal reacts with water. (ii) Cinnabar is heated in the presence of air. (111) Manganese dioxide is heated with aluminium powder. (b) What are alloys ? List two properties of alloys. Advertisement
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WebOct 5, 2024 · Extraction of Mercury: Cinnabar (HgS), a sulphide ore, is the most common mercury ore. The following steps can be used to extract the metal (Hg) from the ore. Step 1: In the air, roast concentrated mercury (II) sulphide ore. Roasting is the process of turning a sulphide ore into its equivalent metal oxides by rapidly heating it in the presence ... Web(a) Cooling cinnabar in the presence of excess air (b) Cooling cinnabar to convert it into mercuric oxide and then heating it (c) Cinnabar to convert it into mercuric oxide and then heating it again (d) Cinnabar in the presence of limited air, and then adding a small amount of water. Correct Answer: Option (c) garnier iced mahogany dark brown
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WebFeb 3, 2024 · The cinnabar is mainly found in Neveda. It has rhombohedral structured crystals. Its also sometimes grey in colour due to presence of impurities. For more information about cinnabar, brainly.in/question/9476022. what is the chemical equation when cinnabar is heated in air?pls ... brainly.in/question/2773006 WebAug 30, 2024 · Cinnabar is the sulfide ore of mercury. The chemical formula for this ore is HgS. This ore undergoes a process of roasting which happens in the presence of … WebCinnabar is heated in air When cinnabar is burned in air, it is converted to mercuric oxide, which produces sulfur dioxide gas. The balanced equation is as follows: 2 HgS s + 3 O 2 g → 2 HgO s + 2 SO 2 g Aluminum oxide reacts with sodium hydroxide Sodium aluminate and water are formed when aluminum oxide combines with sodium hydroxide. garnier iced coffee 41