![]() IaS1 What needs to be considered when investigating a phenomenon scientifically?.2b Plan experiments or devise procedures to make observations, produce or characterise a substance, test hypotheses, check data or explore phenomena.WS2.2 Plan experiments or devise procedures to make observations, produce or characterise a substance, test hypotheses, check data or explore phenomena.WS.2.2 Plan experiments or devise procedures to make observations, produce or characterise a substance, test hypotheses, check data or explore phenomena.Additional salts could include: silver nitrate because silver like copper, is much less reactive than aluminium another set of transition metal salts, eg nickel, cobalt or another set of non-transition metal salts, eg magnesium, calcium. Another activity is to decide whether the rate depends on the quantity of salt added. Other metal salts could be tested to find out if they act as catalysts the difference between transition metal salts and other metal salts could be investigated. After the presentation, be prepared to accept and answer questions and to discuss what you did with the rest of the class. Outline the problem, describe what you did and explain your conclusion. If possible all group members should take part: any method of presentation (such as a blackboard, overhead projector, etc) can be used. Again working as a group, prepare a short (ca 5-minute maximum) presentation to give to the rest of the class.As a group, discuss your results look closely for any patterns that may have emerged in them.Get your method for checked safety and then carry out the practical work.Start with the simplest method possible, and refine it if necessary. Such discussion plays an important part in deciding upon suitable experimental methods. Working as a group discuss the problem and decide how you are going to carry out the investigation.You should divide the practical work amongst the group and keep one another informed of progress. Suggested approachĭuring trialling the following instructions were given to students and proved to be extremely effective: Perhaps this variation was due to impurities present in the reagents. Most trial schools found that the copper(II) chloride was best of all, but some reported that all the copper(II) salts tested were equally good. ![]() Other apparatus and chemicals may be requested during the practical session. The reactions should be carried out in test tubes. copper(II) chloride, copper(II) nitrate and copper(II) sulphate.labelled bottles of solid sodium chloride, sodium nitrate, sodium sulphate,.dilute (approximately 2 mol dm -3) hydrochloric acid and.The following chemicals should be provided at the start of the exercise: Equipmentĭata books and inorganic textbooks should be available for reference. A detailed knowledge is unnecessary as students are encouraged to consult textbooks and data books during the exercise. Reaction of metals with acid and catalysis. Teachers who have not used these problems before should read the section Using the problems before starting. RSC Yusuf Hamied Inspirational Science Programmeįind out which salt or ion, from a selection provided, is the best catalyst for the reaction between aluminium and dilute hydrochloric acid.Introductory maths for higher education.The physics of restoration and conservation.
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