Respuesta :
Answer:
1. By being cured
2. To remove the silica impurities from haemetite
3. The cathode will be bronze while the anode will be the silver
4. i) Wastes from industrial processes
ii) Waste waters and sewage
iii) Dumping of wastes into water bodies
5) Three methods to reduce air pollution includes
i) Promote the use of recycled of materials
ii) Promote and use renewable sources of energy
iii) Limit activities that involve the burning of fuels such as encouraging the use of mass transit buses, preventing the occurrence of fires in forests
Explanation:
1. In order to preserve the proteins in the hides of animal skin from putrefaction they are cured with salt to remove by, osmotic pressure difference, the water content present in the animal hide
2. To remove the silica impurities from haemetite
The calcium oxide obtained from the decomposition of calcium carbonate undergoes a chemical reaction with the sand impurities in the mineral, haematite, to form calcium silicate or s l a g
3. Electroplating involves charging the metal to be electroplated negatively that is making it the cathode and placing it in an electrolytic cell that has a solution of the metal ions containing the metal salts
Therefore, the bronze medal to be plated with silver will be made the cathode while the silver from which we obtain the silver ions will be made the anode
4. Three causes of water pollution includes
Wastes from industrial processes
Waste waters and sewage
Dumping of wastes into water bodies
5. The major causes of air pollution are the oxides produced from the combustion of fossil fuels such as sulfur dioxide, carbon dioxide, carbon monoxide as well as chemical gases from industrial processes.
