As the pH decreases by one MS 2h Describe neutrality in terms AT 8 unit, the hydrogen ion on hydrogen ion concentration of the solution concentration. increases by a factor of 10. Describe relative acidity in terms of hydrogen ion concentration. 5.4.3 Electrolysis Spec ref. Summary of the specification Learning outcomes Suggested Opportunities to develop Opportunities to develop and Self/peer content What most candidates timing Scientific Communication apply practical and enquiry assessment should be able to do (hours) skills skills opportunities and resources Reference to past questions that indicate success 5.4.3.1 When an compound is (HT only) Throughout 1 Explain why solid ionic Carry out the electrolysis of Video clips: melted or dissolved in water, 5.4.3: Higher Tier compounds cannot conduct solutions following the RSC the ions are free to move students should be able electricity but ionic method: about within the liquid or to write half equations compounds can conduct YouTube: solution. These liquids and for the reactions electricity when melted or solutions are able to conduct occurring at the dissolved in water. Write balanced symbol electricity and are called electrodes during equations for these electrolytes. electrolysis, and may be Define the term electrolyte. reactions. required to complete Describe how an electric Passing an electric current and balance supplied current can pass through Write half equations for the through electrolytes causes half equations. an ionic compound. reactions that occur at each the ions to move to the WS 4.1 electrode.
As the pH decreases by one unit, the hydrogen ion concentration of the solution increases by a factor of 10. MS 2h Describe neutrality in terms on hydrogen ion concentration. Describe relative acidity in terms of hydrogen ion concentration. AT 8 5.4.3 Electrolysis Spec ref. Summary of the specification content Learning outcomes What most candidates should be able to do Suggested timing (hours) Opportunities to develop Scientific Communication skills Opportunities to develop and apply practical and enquiry skills Self/peer assessment opportunities and resources Reference to past questions that indicate success 5.4.3.1 When an compound is melted or dissolved in water, the ions are free to move about within the liquid or solution. These liquids and solutions are able to conduct electricity and are called electrolytes. Passing an electric current through electrolytes causes the ions to move to the (HT only) Throughout 5.4.3: Higher Tier students should be able to write half equations for the reactions occurring at the electrodes during electrolysis, and may be required to complete and balance supplied half equations. WS 4.1 1 Explain why solid ionic compounds cannot conduct electricity but ionic compounds can conduct electricity when melted or dissolved in water. Define the term electrolyte. Describe how an electric current can pass through an ionic compound. Carry out the electrolysis of solutions following the RSC method: Write balanced symbol equations for these reactions. Write half equations for the reactions that occur at each electrode. Video clips: YouTube:
AQA-8464-SOW-CCHG.DOCX