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Problem A focuses on defining metals, identifying early known metals, describing physical properties, locating them in nature, understanding metallic ores, and outlining extraction methods. Problem B covers iron and steel production and rust prevention. 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It guides the reader through what metals are and how they are found and extracted.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How are iron and steel discussed in the unit?",{"text":117,"@type":113},"Problem B addresses how iron is produced from ores, what to know about steel, and how cheap steel can be coated to prevent rusting. These questions connect production with practical protection.",{"name":119,"@type":110,"acceptedAnswer":120},"Why do elements divide into non-metals and metals, and what changes their behavior?",{"text":121,"@type":113},"Problem C asks why elements separate into metals and non-metals and compares their chemical properties. 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 \n8  \nQuestion 1 Which were the first metals known to man?  \n8  \nQuestion 2 What are the physical properties of metals?  \n17  \nQuestion 3 In what form are the commonest metals found?28  \nQuestion 4 What is the chemical nature of metallic ores?  \n38  \nQuestion 5 How are some metals extracted from their ores?  \n45  \nProblem B:WHAT SHOULD WE KNOW ABOUT IRON ANDSTEEL?52  \nQuestion 1 How is iron produced from its ores today?  \n52  \nQuestion 2 What should we know about steel?  \n59  \nQuestion 3 How is cheap steel coated to prevent rusting?  \n68  \nProblem C:WHAT ARE THE CHEMICAL PROPERTIES OFMETALS AND NON-METALS?  \n70  \nQuestion 1 What are some chemical properties of metals?  \n70  \nQuestion 2 What are the chemical properties of non-metals?  \n75  \nQuestion 3 Why do elements divide themselves into non-metals andmetals?  \n85  \nProblem D:WHY DOES AN ELEMENT BEHAVE IN DIFFERENTWAYS AFTER DIFFERENT TREATMENTS?94  \n18  \nIndian Steelwork:Construction Co.Ltd.FIGURB1.Tapping molten iron from a blast furnace at Durgapur Steelworks,India.  \nMETALS AND MAN  \nHow would you have liked to live in the Stone Age,with animalskins as your only form of clothing and with flint weapons andsharp sticks as y","cbCaig5TZ8bEmVO7","https://ap.wps.com/l/cbCaig5TZ8bEmVO7","pdf",12215586,100,"English","# Problem A: WHAT DO WE MEAN BY 'METALS'?\n## Question 1 Which were the first metals known to man?\n## Question 2 What are the physical properties of metals?\n## Question 3 In what form are the commonest metals found?\n## Question 4 What is the chemical nature of metallic ores?\n## Question 5 How are some metals extracted from their ores?\n# Problem B: WHAT SHOULD WE KNOW ABOUT IRON AND STEEL?\n## Question 1 How is iron produced from its ores today?\n## Question 2 What should we know about steel?\n## Question 3 How is cheap steel coated to prevent rusting?\n# Problem C: WHAT ARE THE CHEMICAL PROPERTIES OF METALS AND NON-METALS?\n## Question 1 What are some chemical properties of metals?\n## Question 2 What are the chemical properties of non-metals?\n## Question 3 Why do elements divide themselves into non-metals and metals?\n# Problem D: WHY DOES AN ELEMENT BEHAVE IN DIFFERENT WAYS AFTER DIFFERENT TREATMENTS?","[{\"question\":\"What do we mean by 'metals' in this unit?\",\"answer\":\"The unit frames Problem A to define metals and to distinguish them by properties, natural occurrence, and chemical nature. It guides the reader through what metals are and how they are found and extracted.\"},{\"question\":\"How are iron and steel discussed in the unit?\",\"answer\":\"Problem B addresses how iron is produced from ores, what to know about steel, and how cheap steel can be coated to prevent rusting. These questions connect production with practical protection.\"},{\"question\":\"Why do elements divide into non-metals and metals, and what changes their behavior?\",\"answer\":\"Problem C asks why elements separate into metals and non-metals and compares their chemical properties. Problem D then focuses on how an element can behave differently after different treatments.\"}]","METALS AND MAN - Unit THIRTEEN - Problems A-D | PDF",1790573728,252]