All Resource articles – Page 42

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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.
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Find the pattern - metals

Consider data on the specific heat capacities for some metals and solve three problems related to those data.
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Find the chloride

Devise experiments to determine which of five solids is the chloride by using chemicals and apparatus in the laboratory.
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Which detergent is best?

Explain two observations related to the production of a jelly-like solid when two detergents were used in combination.
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Cobalt complexes

Devise structures for cobalt complexes given, decide how to distinguish between the four complexes, and identify some properties that are the same for all four complexes.
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Catalase enzyme reactions

Using four distinct questions, with open-ended methods, to explore catalysts and enzymes.
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Empty space in gaseous argon

How much ‘empty space’ is in a sample of gaseous argon? Students use their knowledge of Avogadro’s number and the concept of atomic size to find out.
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Carbon and copper oxide

Create tests to identify carbon and copper oxide, using knowledge of acids, redox reactions, and metal oxides.
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Measuring CO2 from reactions

Use chemicals and apparatus, devise experiments and determine the amount of carbon dioxide that can be obtained from a mixture of two solids
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Reacting aluminium foil with acid

React aluminium foil and hydrochloric acid with a range of catalysts to discover which serves the reaction best.
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Defining a ‘weak’ acid

Starting from its K_a (or pK_a) value, learners calculate as much information as you need to show what is meant by ‘weak’ in weak acid.