Metals Flashcards
What are the uses of low carbon steel?
Low carbon steel can be used for bodies of motorcars and building structures as it is relatively soft and malleable.
What are the uses of high carbon steel?
High carbon steel can be used for springs and knives as it is hard and brittle.
What are the uses of stainless steel?
Stainless steel can be used for cutlery and surgical instruments as it is resistant to corrosion.
What happens when you react potassium with water?
Reacts very vigorously. A lot of heat is produced. Effervescence observed. Colourless odourless gas ignited in flames. Potassium hydroxide and hydrogen is produced.
What happens when you react magnesium with steam?
Reacts vigorously. Metal glowed with bright white light. Colourless, odourless gas produced extinguished flame with a ‘pop’ sound. White ash of MgO remained after heating
Why doesn’t aluminium react well with oxygen or water?
As aluminium is a reactive metal, a layer of aluminium oxide (Al2O3) is formed. This protective aluminium oxide layer coats the surface of the metal, preventing the metal from reacting with water or oxygen.
Why are more reactive metals extracted by electrolysis of molten ore?
These metals are more reactive (or more easily oxidised) than carbon and cannot be extracted from their oxides by reduction by carbon. These metals are very stable as ions in metal compounds. It is very difficult to extract the metal from its compound. Electricity is needed to decompose the molten ionic compound to obtain the metal.
What is the role of haematite in iron extraction?
Carbon monoxide rises and reduces haematite/iron(III) oxide to form liquid iron and carbon dioxide gas.
What is the role of limestone in iron extraction?
Limestone decomposes into calcium oxide and carbon dioxide. Calcium oxide reacts with silicon dioxide (sand) impurities to form liquid slag (calcium silicate, CaSiO3).
What is the role of coke in iron extraction?
Coke and oxygen burns in a blast of hot air to produce carbon dioxide.
How is the reactivity series ordered, from the most reactive to the least reactive?
Potassium Sodium Calcium Magnesium Aluminium Carbon Zinc Iron Lead Hydrogen Copper Silver
What is the general word equation for the reaction between metal and cold water?
metal + water -> metal hydroxide + hydrogen
What is the general word equation for the reaction between metal and steam?
metal + steam -> metal oxide + hydrogen
What is the general word equation for the reaction between metal and steam?
metal + steam -> metal oxide + hydrogen
What is the general word equation for the reaction between metal and steam?
metal + steam -> metal oxide + hydrogen
