This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
You're on a roll — Here are the solutions to the questions: 6. Study the flow chart below on extraction of copper and answer the questions that follow a) Name the chief copper ore used for the extraction of copper. The chief copper ore used is Chalcopyrite (CuFeS_2). b) The amount of copper in the copper ore is very small. State the method used to concentrate the ore in chamber A. The method used to concentrate the ore in chamber A is Froth flotation. c) Identify substance B and state its function. Substance B is Silica (SiO_2). Its function is to react with iron(II) oxide (FeO) to form molten slag (FeSiO_3), which can be easily removed. d) Write an equation for the reaction that takes place in the roaster. 2CuFeS_2(s) + 4O_2(g) Cu_2S(s) + 2FeO(s) + 3SO_2(g) e) The blister copper obtained is impure. With the aid of a diagram, describe how it can be purified. Blister copper is purified by electrolytic refining. Diagram: An electrolytic cell consisting of: • Anode: Thick block of impure copper (blister copper). • Cathode: Thin sheet of pure copper. • Electrolyte: Aqueous solution of copper(II) sulfate (CuSO_4) acidified with dilute sulfuric acid. Description: When an electric current is passed through the cell: • At the anode, impure copper oxidizes. Copper atoms and more reactive metal impurities (e.g., Zn, Fe) lose electrons and dissolve into the electrolyte as ions (Cu^2+, Zn^2+, Fe^2+). Less reactive impurities (e.g., Ag, Au, Pt) do not oxidize and fall to the bottom as anode sludge. • At the cathode, copper(II) ions (Cu^2+) from the electrolyte gain electrons and deposit as pure copper metal. The more reactive metal ions remain in the solution. Anode (oxidation): Cu(s) Cu^2+(aq) + 2e^- Cathode (reduction): Cu^2+(aq) + 2e^- Cu(s) f) Give two side effects that this process would have on the environment. • Acid rain: The release of sulfur dioxide (SO_2) gas during roasting and smelting contributes to acid rain, harming vegetation and aquatic life. • Habitat destruction and land pollution: Mining operations destroy natural habitats, and the disposal of slag and other waste products can contaminate soil and water. g) Bronze is an alloy of copper and another metal. i) Give the chemical symbol of the other metal. The other metal is Tin, chemical symbol Sn. ii) State one use of bronze. One use of bronze is for making statues (or bells, coins, bearings). RADIOACTIVITY 1. Define the term radioactivity. Radioactivity is the spontaneous disintegration of unstable atomic nuclei, accompanied by the emission of radiation (alpha, beta, or gamma) and the release of energy. 2. State two differences between chemical and nuclear reactions. • Chemical reactions involve the rearrangement of electrons in atoms, while nuclear reactions involve changes within the nucleus of an atom. • Chemical reactions involve relatively small energy changes, whereas nuclear reactions involve very large energy changes. 3. A radioactive element emitted radiations as shown below • Radiation A is deflected towards the negative plate, indicating it is positively charged. This is alpha () radiation. • Radiation B is undeflected, indicating it is uncharged. This is gamma () radiation. • Radiation C is deflected towards the positive plate, indicating it is negatively charged. This is beta () radiation. What's next?