Background: Shipwrecks and artefacts that are submerged in waters of differing abiotic and biotic conditions will corrode and deteriorate at different rates. If salvaged these artefacts and need to be restored and cared for. Once brought to the surface, there are various chemical treatments which can be applied to help restore and or slow the rate of further decay. Understanding the chemistry of redox reactions is imperative to the conservation of marine archaeological objects that have corroded and now ready to restore. Redox reaction include formulae that are explaining these, galvanic cells, electrolytic cells Task: You are to research and present your information in the form of a Science Magazine Article. The font used must be no smaller than 11pt Arial font) and presented on no more than 3 single sided A4 paper sheets. The article has to be enhanced by graphs, tables and diagrams where appropriate. These diagrams and graphs must be identified, labelled and mentioned in the text. Your article will need to include the following: Part A – Background Research Rusting – Define terminology of redox chemistry and discuss in general terms of metals being corroding and chemically restored.Include reactions (Half reactions and all that) give an example within the research assignment Use graphical or tabulated data to identify, analyse and evaluate abiotic (temperature, pH, concentration, acidity, dissolved oxygen levels (water waves), pressure, weather conditions and human activities, salinity if it fresh/salt water salt water = theres ions in the electrolyte-water) factors which would impact on the rate at which the rust is formed. Salvaging – Identify any chemical processes that can minimise degradation of the wreck during the salvage process. What would o do to restore the wreck in those particular conditions or what would you do to avoid the corrosion. Restoration – Discuss the various chemical processes (include chemical equations) of how the corroded metals can be returned to their original states. Electrochemical cells Part B- Comparison of Shipwrecks The Yongala and the Titanic are two well-known shipwrecks of similar age, situated in areas that have very different water conditions (links with the abiotic factors). Compare and contrast the abiotic conditions surrounding these two shipwrecks and relate this to the corroded conditions that the wrecks are found in today. Conclude and justify based on your exploration of the two sites, which shipwreck would be the least corroded and best for salvaging either artifacts or sections of the wreck.
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