This economics question tests your understanding of economic models and analysis. The step-by-step answer below applies the relevant framework and explains the reasoning.
ScanSolve AI Answer
Right, let's go. Metals are elements that typically form positive ions and have characteristic properties like good electrical and thermal conductivity, malleability, ductility, and a lustrous appearance. Their compounds often involve ionic bonds. Alkali metals, such as Sodium (Na), are highly reactive Group 1 elements with one valence electron, readily forming +1 ions. Sodium hydroxide (NaOH) is a strong base. Production of sodium hydroxide by electrolysis of brine: Brine (concentrated aqueous sodium chloride, NaCl) is electrolyzed. 2NaCl(aq) + 2H₂O(l) → 2NaOH(aq) + Cl₂(g) + H₂(g) This process produces sodium hydroxide, chlorine gas, and hydrogen gas. Action of sodium hydroxide on aluminum, zinc, and lead ions: Sodium hydroxide reacts with these metal ions to form insoluble hydroxide precipitates, which then redissolve in excess NaOH to form soluble hydroxo complexes. For aluminum ions: Al³⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s) Al(OH)₃(s) + OH⁻(aq) → [Al(OH)₄]⁻(aq) (tetrahydroxoaluminate(III) ion) Similar reactions occur for Zn²⁺ and Pb²⁺ ions. Uses of sodium hydroxide: It is used in soap and detergent manufacturing, paper production, and to precipitate metallic hydroxides from solutions, for example, in water treatment. Sodium trioxocarbonate(IV) (Na₂CO₃, also known as sodium carbonate or soda ash) and sodium hydrogen trioxocarbonate(IV) (NaHCO₃, also known as sodium bicarbonate or baking soda) are produced by the Solvay process. Solvay process: This industrial process uses ammonia, carbon dioxide, and brine (NaCl) as raw materials. NaCl(aq) + NH₃(g) + CO₂(g) + H₂O(l) → NaHCO₃(s) + NH₄Cl(aq) NaHCO₃ is then heated to produce Na₂CO₃: 2NaHCO₃(s) → Na₂CO₃(s) + H₂O(g) + CO₂(g) Properties and uses: Na₂CO₃ is a white solid, soluble in water, and forms alkaline solutions. It's used in glass manufacturing, detergents, and water softening. NaHCO₃ is also a white solid, less soluble than Na₂CO₃, and is used as a leavening agent in baking, in antacids, and in fire extinguishers. Sodium chloride (NaCl) is common table salt, an ionic compound essential for life, and a primary source of sodium and chlorine for industrial processes. Alkaline-earth metals are Group 2 elements (e.g., Magnesium, Calcium) with two valence electrons, forming +2 ions. They are less reactive than alkali metals but still quite reactive, forming basic oxides and hydroxides. Aluminium (Al) is a light, strong, and corrosion-resistant metal. It is an excellent conductor of electricity and heat and is widely used in aerospace, construction, and packaging. Tin (Sn) is a soft, silvery-white metal known for its low melting point and resistance to corrosion. It is used as a protective coating for other metals (e.g., tin cans) and in alloys like bronze and solder. Metals of the first transition series (Scandium to Zinc) are characterized by having incompletely filled d-orbitals in their atoms or common ions. They typically exhibit variable oxidation states, form colored compounds, and act as catalysts. Iron (Fe) is a ferromagnetic metal, abundant and widely used in steel production due to its strength and relatively low cost. It is prone to rusting. Copper (Cu) is a reddish-brown metal, highly ductile and malleable, and an excellent conductor of electricity and heat. It is extensively used in electrical wiring, plumbing, and coinage. An alloy is a mixture of two or more elements, at least one of which is a metal, to create a new material with enhanced properties (e.g., strength, corrosion resistance) compared to the pure metals. Examples include steel (iron and carbon) and brass (copper and zinc). What's next?