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Flashcards in C2h Deck (7)
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1
Q

How is salt extracted from the ground?

A
  • drilled, blasted and dug out and brought to the surface by machinery
  • solution mining
2
Q

Why is it important to fill holes after mining?

A

-land could collapse and slide into holes (subsidence)

3
Q

What are the useful products of the electrolysis of brine?

A
  • hydrogen gas
  • chlorine gas
  • sodium hydroxide
4
Q

How is sodium chloride solution (concentrated brine) electrolysed?

A

-electrodes made of inert materials, so they don’t react with the electrolyte or products
1-brine enters
2-at cathode two hydrogen ions accept one electron each to become on hydrogen molecule
3-at anode two chloride ions lose one electron to become one chlorine molecule

5
Q

What are the uses of the products of the electrolysis of brine?

A
  • hydrogen gas:make ammonia and margarine
  • chlorine: disinfect water, make plastic and solvents and hydrochloric acid
  • sodium hydroxide:used to make soap, can be reacted with chlorine to make household bleach
6
Q

What is solution mining?

A
  • pumping hot water underground

- salt dissolves and salt solution is forced to surface by pressure of the water

7
Q

Why is the chloro-alkali industry important for the economy?

A
  • may uses of the products from reaction

- lots of new products can be made and lots of jobs created