Karteikarten
CHEMISTRY C1 3
Karten in diesem Stapel (18)
- 1Where do metals come from?Metals are found in the Earth's crust, most metals are found in their ores
- 2Why don't we find gold in an ore?Because it is unreactive and won't react with chemicals around it
- 3Which metal oxides can we use carbon to extract the metal from?Metal oxides where the metal is below carbon in the reactivity series
- 4Which metals cannot be extracted using carbon?Metals above carbon in the reactivity series
- 5How do we extract iron from iron ore?By reducing it using carbon in a blast furnace
- 6Why is pure iron not very useful?It is too soft
- 7What are alloys?A mixture of different metals usually put together to make the metal stronger
- 8What are the important examples of steels?-Low carbon steels, which are easily shaped
-High carbon steels which are very hard
-Stainless steels which are resistant to corrosion - 9Why are aluminium and titanium so useful?They are stainless steels and therefore can resist corrosion
- 10What method is used to extract metals that are more reactive than carbon?Electrolysis
- 11Why are aluminium and titanium so expensive to extract?Because electrolysis has many stages and requires large amounts of energy
- 12How is copper obtained from copper-rich ores?Smelting (roasting), where you heat the copper in a furnace with air to produce crude copper
- 13What methods can be used to obtain copper from low-grade ores?Bioleaching, where bacteria feed on the ores or Phytomining, where plants like broccoli absorb the copper and can then be burnt to leave you with just the copper.
- 14How is copper purified?By electrolysis
- 15What are transition metals?Metals found in the middle block of the periodic table
- 16Why are transition metals so useful?They are good conductors of electricity and energy, they are strong but can be bent or hammered into useful shapes
- 17Why is copper such a useful metal?It can be bent but is still strong, it does not react with water so it can be used in plumbing
- 18Why are alloys more useful than pure metals?They are much stronger