WebOct 29, 2006 · 1 Problem: Galena (PbS) is heated in air to form lead (II) Oxide. 2PbS (s) + 3O2 (g) --- 2PbO (s) + 2SO2 (g) What mass of galena is converted to lead oxide if 975 KJ of heat are liberated? My Approach: 975 KJ x (1mol/827.4KJ) = 1.18 mol 1.18 mol PbS x (239.3g PbS/1mol PbS) = 282g PbS Web(i) Calcium metal reacts with water. (ii) Cinnarbar is heated in the presence of air. (iii) Manganese dioxide is heated with aluminium powder. (b) What are alloys ? List two properties of alloys. Answers (1) (b) Alloys are the homogeneous mixture of two or more metals or one metal and a non-metal.

When Cu2S is heated in air, the products obtained are

WebQuestion #229102. Galena is the ore from which elemental lead is extracted. In the first step of the extraction process, galena is heated in air to form lead (II) oxide. 2PbS ( s) + 3O 2 ( g) → 2PbO ( s) + 2SO 2 ( g) Δ H = -827.4 kJ. What mass of galena is converted to lead oxide if 975 kJ of heat are liberated? WebApr 5, 2024 · Write chemical equation for the following reactions:a.) Calcium metal reacts with water.b.) Cinnabar is heated in the presence of air.c.) Manganese dioxide is heated with aluminium powder.. Ans: Hint: In order to … dallas bbq sticky wing sauce

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WebCinnabar is a hydrothermal mineral that precipitates from ascending hot waters and vapors as they move through fractured rocks. It forms at shallow depths where temperatures are less than about 200 degrees Celsius. It … WebCinnabar Meanings, Zodiacs, Planets, Elements, Colors, Chakras, and more. Science & Origin of CinnabarCinnabar, also known as Cinnabarite, is a mercury sulfide mineral that … WebCinnabar has been used for thousands of years as a coloring agent because of its intense red-orange color. It is obtained naturally by grinding ore into a fine powder then mixing the powder into dyes, paints and other … dallas bbq lunch ribs or steak