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- 2. (Balance the equation) FeCl+NaOH>Fe(OH);+NaclFor many years the recovery of gold—that is, the separation of gold from other materials—involved the use of potassium cyanide: Au + KCN + O2 + H2O à KAu(CN)2 + KOH (a) Balance the above chemical equation. (b) What is the minimum amount of potassium cyanide in grams needed to extract 29.0 g (about an ounce) of gold?Chrom ium metal reacts with oxygen to give chromiu m(III) oxide, Cr2O3. (a) Write a balanced equation for the reaction. (b) What mass (in grams) of Cr2O3 is produced if 0.175 g of chromium metal is converted completely to the oxide? (c) What mass of O2 (in grams) is required for the reaction?
- Magnesium reacts with oxygen to form magnesium oxide according to the following reaction: 2 Mg + O2 2M9O (a) What is the oxidation state of magnesium in Mg? (b) What is the oxidation state of magnesium in MgO? (c) Which species is oxidized? (d) Which species is reduced? (e) Name the oxidizing agent.a) b) Br OH OH NHPh OH +EBalance the following equations:
- Write the balanced chemical equation for the reaction of these pairs of reactants: (a) Calcium and bromine (b) Aluminum and oxygenFor many years the recovery of gold—that is, the separation of gold from other materials—involved the use of potassium cyanide: Au + KCN + O2 + H2O à KAu(CN)2 + KOH (a) Balance the above chemical equation. (b) What is the minimum amount of potassium cyanide in grams needed to extract 29.0 g (about an ounce) of gold?Complete and balance the following acid-base equations:(a) A solution of HClO4 is added to a solution of LiOH.(b) Aqueous H2SO4 reacts with NaOH.(c) Ba(OH)2 reacts with HF gas.
- Solid boron can be extracted from solid boron oxide by reac- tion with magnesium metal at a high temperature. A second prod- uct is solid magnesium oxide. (a) Write a balanced equation for the reaction. (b) What mass of boron can be produced when 125 kg of boron oxide is heated with 125 kg of magnesium?write a balanced chemical equation for each (A) Iron (III) chloride reacts with sodium hydroxide to produce iron (III) hydroxide and sodium chloride. (B) Magnesium nitrite reacts with perchloric acid to produce magnesium perchlorate and nitrous acid. (C) Copper(II) hydroxide reacts with hydrosulfuric acid to produce copper (II) sulfide and water.Name the products formed in each case when(a) hydrochloric acid reacts with caustic soda.(b) granulated zinc reacts with caustic soda.(c) carbon dioxide is passed into lime water.