All Resource articles – Page 40
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The 2011 International Year of Chemistry Experiment
Worksheets and data from the 2011 mass participation experiment. Measure the acidity (pH) and salinity of your local water.
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On This Day – Aug 04 : Nicolas-Jacques Conté born
He developed a method for making pencil leads, by mixing powdered graphite with clay and firing the mixture in a kiln. This method is still used to make pencils today. Until this point, pencil leads were made from pure graphite sticks that could only be imported to France from Cumbria in the UK. By varying the ratio of clay and graphite powder, the hardness of the pencil lead could also be changed.
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On This Day - Nov 15 : Chlorine declared element
It was previously thought that chlorine was a compound rather than an element, named oxymuriatic acid, until the British chemist and inventor presented his discovery to the Royal Society.
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Ion-exchange resin and water
Evaluate the advantages and disadvantages of a selection of resins and decide which one(s) would be best for producing pure water from seawater on a life raft.
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Identifying six unknown solutions
Devise experiments to label six numbered solutions correctly using chemicals and apparatus in the laboratory.
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Thermodynamic quantities in a reaction
Calculate the thermodynamic quantities for a reaction using the standard enthalpy of neutralisation (strong acid and strong base) and any other information.
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Chemical and physical properties of pheromones
Help learner’s to understand what pheromones are, and how they are used by animals such as moths.
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The thickness of titanium atoms in paint
Discover the thickness of a film of paint, estimating how thick it is by titanium atoms/ions.
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Making copper
Learners develop their own scientific methods to make copper metal starting from copper(II) nitrate crystals.
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On the acid trail: discovering a 'weak' acid
Using titration and plot pH against volume to discover more about a weak, monoprotic acid.
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Jets of liquids: the effect of charged plastic on water
Polar covalent bonds, and their affects on water are explored in this open-ended problem.
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The best catalyst to decompose hydrogen peroxide
Develop learner’s ideas of catalysis with this open-ended problem using hydrogen peroxide.
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Identifying three unknown white solids
Devise experiments to label three white solids correctly by using chemicals and apparatus in the laboratory.
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Helping an industrial chemist
Devise a method for making a copper catalyst dispersed on an aluminium oxide support.
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What compound? Identify and analyse
Learners can devise their own testing system to identify the nature of a mystery compound.
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Amino acids and hair growth
Discover how quickly human hair grows, and develop learner’s understanding of amino acids too.
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H⁺ ions in water
Allow learners the chance to develop their own testing methods to identify H+ ions in samples of water.
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Identifying four unknown solutions
Allow learner’s the opportunity to devise their own testing protocols to identify chloride ions in four solutions.
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Finding the right ionic compound
Devise a procedure to identify four solids and then use this to carry out the identification.