1449304
Beschreibung
Karteikarten von Zara Kanani, aktualisiert more than 1 year ago
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Erstellt von Zara Kanani
vor etwa 10 Jahre
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| Frage | Antworten |
| What do Ores contain? | Metals which can be extracted, purified and sold. |
| How are metals which are more reactive than carbon extracted e.g. Aluminium? | They are extracted using electrolysis of a metal compound. |
| Why can electrolysis sometimes not be financially feasible? | Sometimes the process of extracting the metal can be more than the metal can be sold for. They can also use a lot of energy and time. |
| What other ways can we extract metals? | Using processes such as bioleaching, phytomining. These methods can sometimes be cheaper than electrolysis. |
| Why are we encouraged to recycle metals? | Because the processes used to extract metals can be expensive, time consuming and can have negative effects on the environment. |
| What is an ore? | It's a naturally occurring rock which is chemically combined with oxygen and impurities. |
| What happens when we concentrate a metal ore? | We take away some of the impurities, this ensures that the ore itself will have more metal concentrated inside. |
| What happens when the demand for a metal increases? | The prices for extracting and selling the metal changes. |
| Write the word equation for this symbol equation: 2CuO+C= 2Cu+Co2 | Copper oxide+carbon= copper+carbon dioxide Copper oxide is black and reduces to make copper. Carbon oxidizes to make carbon dioxide. |
| What is steel? | Steel is an alloy which is mixed with other metals so that we can change the properties of the steel. |
| Why is iron from a blast furnace brittle? | Because it contains mainly carbon and 96% impurities and carbon. It's not very useful because it's too soft. |
| Why are low-alloy steels expensive? | Because they contain 1-5% of other metals. |
| What determines which method we use to extract a metal? | The place of the metal in the reactivate series. More reactive metals such as carbon displace less reactive metals from their oxides. |
| What is copper found as? | Copper sulphide christals. |
| Why is electrolysis of copper not worth the effort nowadays? | Because ore's only contain 1% copper. |
| What metal ore can copper be extracted from? | Malachite. |
| Extracting copper from malachite equation. H2SO+CuO=CUSO4+H20 | Sulphuric acid+copper oxide=copper sulphate+water. |
| Equation for malachite. | CuCO3=CuO+C02 |
| What is copper used for? | Water pipes and electrical wiring. |
| What is phytomining? | Using special plants to absorb the metals from soil as they grow. |
| What is bioleaching? | Using bacteria to eat the cu ions from the rock. |
| What is the displacement reaction for copper? | Copper sulphate+iron= iron sulphate+copper. |
| What is reduction? | The process of removing oxygen. |
| What is oxidization? | This is gaining oxygen. |
| What is a thermit reaction used for? | Molten iron is produced to weld two railway lines together. |
| What property does both Aluminium and Titanium share? | They don't corrode. |
| Name some properties of Al (aluminium)? | Shiny, silvery and a good conductor of energy and electricity. |
| Al reacts with oxygen and this creates a thin layer of what, to stop the corrosion on the metal? | Al2O3 |
| Name some items which Al is used to make? | Cans, cooking foil, electricity cables. |
| Why can gold be found in it's native state? | Because it's a less reactive metal. |
| When is electrolyte used? | When doing electrolysis. |
| What is the name of the positive electrode? | Anode |
| What is the name of the negative electrode? | Cathode. |
| Definition native state? | When a metal is found chemically uncombined in nature. |
| What is a smart alloy? | An alloy which is able to be bent and deformed and then have the ability to bend back into shape. |
| Why is Al difficult to extract? | Because it's a more reactive metal which is combined with clay and rock. Al ore is called bauxite. |
| What does cryolite do? | It is another Al ore and it is used to lower the melting point when using electrolysis to extract Al from bauxite. |
| How do we extract iron from the iron ore? | By reducing it using carbon in the blast furnace. |
| How is copper obtained from copper rich ores? | By using the method of smelting, this is when you heat copper in a blast furnace with air which will produce crude copper. |
| If a metal is below carbon in the reactivate series what method is used to extract the metal? | You can use a displacement reaction to take away the oxygen and by doing this you will create the gas carbon dioxide. |
| If a metal is above carbon in the reactivity series what method can you use to extract the metal? | Electrolysis. |
| What is smelting? | Heating an ore in a large furnace. |
| During electrolysis what happens to the positive copper electrodes? | They become attracted to the negative copper electrode. |
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