used. Students Students set up choice of out the experiment then set up chromatograms solvents. chooses equipment, chromatograms using extracts Students set up materials, justifying all using extracts from the chromatograms choices. from the leaves. leaves. using extracts Students Students from the chosen measure Rf measure Rf leaves, using values for values for chosen solvent. pigments from pigments from Students each leaf. each leaf. measure Rf Experiments Experiment values for fully specified in probably fully pigments from terms of specified by each leaf. equipment and teacher. Outline method. procedure and equipment provided by teacher. Opportunities for observation and assessment of competencies Follow Students Students follow Students follow a Students follow written follow written an outline method they have written method. procedures method. method. researched. Applies Students must choose investigative an appropriate approaches Students must Students must Students must approach, equipment and correctly use the correctly use correctly use the and techniques and methods appropriate the appropriate appropriate identify correct when using equipment. equipment. equipment. variables for instruments measurement and and control. equipment Safely uses a range of Students Students must carry Students must Students must practical minimise risks out a full risk safely use the safely use the equipment with minimal assessment and equipment. equipment. and prompting. minimise risks. materials Students make Students make Students make Students must choose Makes and measurements measurements measurements the most effective way records to calculate Rf to calculate Rf to calculate Rf of recording observations values values values observations Students Students Students Students must compare compare results compare results research alternatives in results with Researches, with published with published order to plan their work. published Rf references Rf values for Rf values for that Reporting covers the for that solvent and reports that solvent and solvent and planning, carrying out values and identify reasons between and an analysis of their between for differences. students and results using students and
used. Students set up chromatograms using extracts from the leaves. Students measure Rf values for pigments from each leaf. Experiments fully specified in terms of equipment and method. Students set up chromatograms using extracts from the leaves. Students measure Rf values for pigments from each leaf. Experiment probably fully specified by teacher. choice of solvents. Students set up chromatograms using extracts from the chosen leaves, using chosen solvent. Students measure Rf values for pigments from each leaf. Outline procedure and equipment provided by teacher. out the experiment then chooses equipment, materials, justifying all choices. Opportunities for observation and assessment of competencies Follow written procedures Students follow written method. Students follow written method. Students follow an outline method. Students follow a method they have researched. Applies investigative approaches and methods when using instruments and equipment Students must correctly use the appropriate equipment. Students must correctly use the appropriate equipment. Students must correctly use the appropriate equipment. Students must choose an appropriate approach, equipment and techniques and identify correct variables for measurement and control. Safely uses a range of practical equipment and materials Students must safely use the equipment. Students must safely use the equipment. Students minimise risks with minimal prompting. Students must carry out a full risk assessment and minimise risks. Makes and records observations Students make measurements to calculate Rf values Students make measurements to calculate Rf values Students make measurements to calculate Rf values Students must choose the most effective way of recording observations Researches, references and reports Students compare results with published Rf values for that solvent and identify reasons for differences. Students compare results with published Rf for that solvent values and between students and Students compare results with published Rf values for that solvent and between students and Students must research alternatives in order to plan their work. Reporting covers the planning, carrying out and an analysis of their results using
aqa-practical-hand-book-requirements.docx