Chemistry of sodium chloride - C2h - Flashcards in GCSE Science

Created by: iram_f
Created on: 25-11-14 22:14

What is subsidence?

Subsidence is the shaking or buckling of the ground due to underground mining - it used to be a major problem but now mining is more tightly controlled.

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What occurs in the electrolysis of sodium chloride solution?

Sodium chloride solution contains sodium chloride (Na+ & Cl-) & water (H+ & OH-). At the cathode hydrogen & sodium ions compete to be reduced-hydrogen is collected. At the anode chlorine & hydroxide ions compete to be oxidated-chlorine is collected.

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How can we test for chlorine and hydrogen?

We can test for chlorine using moist pH paper, which bleaches it white as it is a powerful bleach. To test for hydrogen we light a splint and put it in a test tube - a squeaky pop indicates hydrogen is present.

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What are the half equations?

At the cathode hydrogen atoms are collected: 2H+ + 2e- = H2 (reduction). At the anode chlorine atoms are collected: 2Cl- - 2e- = Cl2 (oxidation).

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What is the chlor-alkali industry?

Chlorine and sodium hydroxide are raw materials that can then go on to be used in other industries, thus producing more products.

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How can we use the products of the electrolysis of sodium chloride solution?

Chlorine gas sterilises water and is used to make bleach, solvents and plastics. Hydrogen can be used to create margarine, fuel cells or be used in the Haber process. Sodium hydroxide is used to make soap.

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Other cards in this set

Card 2

Front

What occurs in the electrolysis of sodium chloride solution?

Back

Card 3

Front

How can we test for chlorine and hydrogen?

Back

Card 4

Front

What are the half equations?

Back

Card 5

Front

What is the chlor-alkali industry?

Back

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Chemistry of sodium chloride - C2h