Chinese invention is the development of iron and steel. The development of iron and steel led to other advances. In the 4th century the Chinese had developed blast furnaces to obtain cast iron from iron ore. The Chinese had access to large amounts of clay; clay was the most important ingredient in making blast furnaces. The Chinese also figured out that by adding a substance they called "Black Earth‚" they could lower the melting point of iron. Today iron and steel are used in many things from clocks
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Quantitative Analysis Gravimetric Determination of Iron as Fe2O3 Laboratory Experiment 2 February 19‚ 2013 Abstract: In the Gravimetric determination is the measurement of mass in two different forms precipitation and volatilization. In our experiment we will be using the precipitation form which isolates an ion in a solution by a precipitation reaction‚ filtering‚ purifying by wash method‚ conversion to product of known composition‚ and final weigh of the product comparing the mass
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First pottery appears • 3rd millennium BC – Copper metallurgy is invented and copper is used for ornamentation • 2nd millennium BC – Bronze is used for weapons and armour • 16th century BC – The Hittites develop crude iron metallurgy • 13th century BC – Invention of steel when iron and charcoal are combined properly • 10th century BC – Glass production begins in ancient Near East • 1st millennium BC – Pewter beginning to be used in China and Egypt • 3rd century BC – Wootz steel‚ the first crucible
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three of the five most commonly consumed food vehicles as reported by the National Food Consumption Survey. The National Food Consumption Survey reported that for South African children as a whole‚ the average dietary intake of energy‚ calcium‚ iron‚ zinc‚ selenium‚ vitamin A‚ vitamin D‚ vitamin C‚ vitamin E‚ riboflavin‚ niacin‚ and vitamin B6 was less than 67% of the Recommended Dietary Allowances (RDA)‚ and in many cases below 50% of the Recommended Dietary
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when they are in contact with salt water‚ and acid rain. We chose to see what would happen to various metals when they contacted with salt water. When the electrons move around in the salt water‚ it causes the metals to rust. The metals we chose were iron‚ copper‚ lead‚ zinc‚ and aluminum. Those are some of the most commonly used industrial metals. We got the salt water directly from the beach‚ so that we would get the same reaction if this happened in real life. The chemicals that are
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The steel in our buildings is made with iron‚ which is a mineral. The clay and glass used in our pottery and dishes are made of a mixture of rocks and minerals. We even need minerals to stay healthy‚ and we get them from a variety of different foods. Virtually everything we use or build or create in modern life involves rock‚ mineral and fuel resources taken from the earth. To categorized these in groups Metallic (platinum‚ gold‚ silver‚ aluminum‚ iron‚ tin) Nonmetallic (diamonds and other precious
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Aluminum is the third most plentiful element in the earth’s crust. It is the second most widely used material in new cars and trucks in the world. Before aluminum foil was invented‚ food and other items were packed in tin foil. However‚ tin foil was too stiff to be malleable‚ and some experts feared that it might affect food adversely. History Although others have vied for the honor‚ history credits Hans Christian Oersted‚ a Danish chemist for the initial discovery of aluminum foil‚ 1n 1825. On
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CHEMICAL WEATHERING Chemical weathering is a process of alteration of rocks of the Earth’s crust. is a chemical decomposition process. is brought out by atmospheric gases and moisture. End product has a different chemical composition and poorer physical constitution. The process: Chemical change in the nature of rock takes place in the presence of moisture containing many active gases such as CO2‚ N2‚ H2‚ and O2. Rocks are made up of minerals. All the minerals in a rock are not in
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to 2000 bc “True bronze (a copper-tin alloy) did not appear until around 3000 BC.”only being passed at first by iron and later by steel. Iron had been around as long as bronze but it offered little advantage as it was harder to form not as durable and didn’t keep an edge as well as bronzed did. its only plus side being that it was more abundant in the earths crust and easier to get. Iron on its own was nothing special but when carbon was added a truly amazing discovery was made‚ steel. Steel was
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such as electrical energy‚ sound‚ or light. An Example –The example would be combustion of wood. Oxidation - Oxidation is the loss of electrons during a reaction by a molecule‚ atom or ion. An Example - The example is iron combines with oxygen to form iron oxide or rust. The iron is said to have oxidized into rust. Heating natural gas - Natural gas is a fuel made of methane‚ mixed with up to 20% of other gasses such as ethane and other hydrocarbons. An example - Natural gas is a popular choice
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