All Resource articles – Page 44

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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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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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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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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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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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Making copper

Learners develop their own scientific methods to make copper metal starting from copper(II) nitrate crystals.
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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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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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Helping an industrial chemist

Devise a method for making a copper catalyst dispersed on an aluminium oxide support.
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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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Amino acids and hair growth

Discover how quickly human hair grows, and develop learner’s understanding of amino acids too.
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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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Driving force: what makes reactions go

Carry out certain experiments in a given order
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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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Finding the right ionic compound

Devise a procedure to identify four solids and then use this to carry out the identification.
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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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Find the pattern - alcohols

Consider data on the densities of six primary alcohols and solve four problems based on those data.