C3.3.13 describe the principal methods for increasing the availability of potable water, in terms of the separation C1.4.1  understand that there may be techniques used, including the ease of disadvantages of chlorinating drinking treating waste, ground and salt water water, including possible health including filtration and membrane problems from traces of chemicals filtration; aeration, use of bacteria; formed by reaction of chlorine with chlorination and distillation (for salt organic materials in the water water) C3.3.14 understand that an electric current can C3.3.1 be used to bring about chemical  change and make new chemicals describe electrolysis in terms of the ions through a process called electrolysis present and reactions at the electrodes C3.3.15 describe competing reactions in the electrolysis of aqueous solutions of ionic C3.3.7 compounds in terms of the different  recall that chlorine is now obtained by species present, including the formation the electrolysis of salt solution (brine) i of oxygen, chlorine and the discharge of Technical details and the ionic metals or hydrogen linked to their reactions are not required relative reactivity C3.3.16 recall examples of important uses by NA industry of the sodium hydroxide,  chlorine and hydrogen produced by electrolysis of brine C3.3.17 interpret data about the environmental NA  impact of the large scale electrolysis of brine C3.4.1 understand that there is a large number of industrial chemicals with NA many widespread uses, including  consumer products, for which there is inadequate data to judge whether they are likely to present a risk to the environment and/or human health C3.4.2 . understand that some toxic chemicals cause problems because they persist NA  in the environment, can be carried over large distances, and may accumulate in food and human tissues
C3.3.13 understand that there may be disadvantages of chlorinating drinking water, including possible health problems from traces of chemicals formed by reaction of chlorine with organic materials in the water C1.4.1 describe the principal methods for increasing the availability of potable water, in terms of the separation techniques used, including the ease of treating waste, ground and salt water including filtration and membrane filtration; aeration, use of bacteria; chlorination and distillation (for salt water)  C3.3.14 understand that an electric current can be used to bring about chemical change and make new chemicals through a process called electrolysis C3.3.1 describe electrolysis in terms of the ions present and reactions at the electrodes  C3.3.15 recall that chlorine is now obtained by the electrolysis of salt solution (brine) i Technical details and the ionic reactions are not required C3.3.7 describe competing reactions in the electrolysis of aqueous solutions of ionic compounds in terms of the different species present, including the formation of oxygen, chlorine and the discharge of metals or hydrogen linked to their relative reactivity  C3.3.16 recall examples of important uses by industry of the sodium hydroxide, chlorine and hydrogen produced by electrolysis of brine NA  C3.3.17 interpret data about the environmental impact of the large scale electrolysis of brine NA  C3.4.1 understand that there is a large number of industrial chemicals with many widespread uses, including consumer products, for which there is inadequate data to judge whether they are likely to present a risk to the environment and/or human health NA  C3.4.2 . understand that some toxic chemicals cause problems because they persist in the environment, can be carried over large distances, and may accumulate in food and human tissues NA 
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