C 1.3 metals Flashcards
What is phytomining?
Using plants to absorb metal compounds from the soil. The plants are then burnt and the metal extracted from the ash.
Why are metallic bonds strong?
The electrostatic forces of attraction between the delocalized electrons and positive ions take a lot of energy to overcome.
Copper can be obtained by reacting solutions of copper compounds with scrap iron. What is the name for this type of chemical reaction?
A displacement reaction
What process is used to purify copper?
Electrolysis is used to purify copper.
What raw materials go into the blast furnace?
Limestone, iron ore and coke
What does brittle mean?
It can break easily
Which is a typical property of metals?Low melting pointBrittleMalleable
Malleable
Why can metals conduct electricity?
They contain delocalized electrons.
What is the percentage of iron in the iron from a blast furnace?96%41%83%
96%
What method of extraction is this? Some bacteria absorb copper compounds. They then produce solutions called leachates, which contain copper compounds.
Bioleaching
Why is aluminium extracted from aluminium ore by electrolysis?
Aluminium is more reactive than carbon so cannot be extracted by carbon reduction.
What is an alloy?
An alloy is a mixture of two or more elements, where at least one element is a metal. Many alloys are mixtures of two or more metals.
What is special about special memory alloys?
Shape memory alloys can return to their original shape after being bent or twisted.
Do they have high or low melting and boiling points
High melting and boiling points because of the strong electrostatic forces of attraction between the positive ions and delocalised ions.
Why is copper iused to make electrical wiring because
It is excellent conductor of electricity.
