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Chameleon bubbles are formed when a sodium alginate solution is dropped into a calcium chloride solution. The bubbles are filled by an acid‐base indicator solution; so, adding the beads to acids or bases leads to colour changes inside the bubbles by diffusion and pH change. Students can learn about acids, bases,...
The chemical garden is a well‐established experiment from the chemistry of salts, solubility, diffusion, and solutions. The nice thing is that if metal salts are put in sodium water glass solution, it can lead to an effect reminiscent of plants growing. This growing process can be observed and analysed. In the end...
Two translucent liquids are mixed. At first, nothing happens: the resulting solution is still translucent. Suddenly, with no warning, the solution turns blue-black all at once.
Curriculum links include redox reactions, rate of reaction, kinetics
In this project, students make their own aspirin or paracetamol and then test the purity of the pain-reliever and compare it to shop-bought. This covers titrations, chromatography and other analytical techniques.
The aim of this project is to investigate the properties of alcohol/water mixtures, and how these properties can be used to measure alcohol content. The alcohol in drinks is ethanol, C2H5OH. However, the ethanol used in the laboratory has been methylated by adding 5% of methanol, CH3...
Gelli Baff, a crystalline powder, has been dumped into a bathtub filled with water. How can you force the hydrogel to go down the plughole in order to drain the bathtub?
In this investigation, students learn about swelling reactions, balanced reactions, and polymerisation. Students should be able to...
In the context of finding out why we grit roads in winter, students are shown what happens when salt is sprinkled onto ice lollies. They are then asked If they believe that the temperature of the ice lolly with the salt will increase or decrease, causing it to melt faster. Students then investigate some...
The mystery revolves round a detective story which the students gradually solve. A jeweller has been murdered: the suspects are his metal suppliers but the motive and the culprit are initially unknown.
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The mystery ...
Students research, and then try out, ways of detecting analgesic compounds in mixtures:
• Chemical tests for particular organic functional groups.
• Paper and/or thin-layer chromatography to separate and identify analgesic...
In this project students use chromatography to detect forged cheques and other documents and various types of counterfeit goods. They will also investigate the best solvents to extract the inks and run TLC plates in order to compare the inks from the same part of a document printed on different models of a printer...
This resource describes 30 hours of independent project work for a silver Crest Award on the subject of art restoration. Students start by carrying out some research about paint pigments:
- What did early artists use? How did they colour their paints? What pigments were available to them?
- ...
In this independent research project students research the causes and consequences of diarrhoea and dehydration. They find out about the different treatments available for dehydration and design some experiments to compare commercial and homemade oral rehydration salts.
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Students investigate the effect of industry or agriculture on a water course, by comparing levels of pollution with those in an ‘unspoilt’ body of water. They will need to consider what form any pollution...