All Group work articles – Page 3

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Jets of liquids

Investigate what happens when different charged plastics are held near a jet of water issuing from a burette, and explain your observations.
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Hydrogen peroxide

Find the best catalyst for the decomposition of hydrogen peroxide from solutions provided.
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Three 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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Hair

Estimate the approximate rate of growth of human hair in ms⁻¹ and use this figure to estimate the number of amino acid molecules which are incorporated in a growing hair every second.
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What compound?

Identify a given solid; make a list of all of the compounds the solid could be, suggest as many ways as possible of identifying the solid and use this information to devise an analytical procedure; use this procedure to identify the solid.
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H⁺ ions in water

Estimate the number of H⁺(aq) ions in a single drop of: water; 1.0 mol dm⁻³ HCl; 1.0 mol dm⁻³ NaOH.
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What makes it go?

Carry out certain experiments in a given order. Then without doing any calculations, explain what the driving force of the reaction is in each case – ie qualitatively rather than quantitatively.
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Four solutions

Devise experiments to label some bottles correctly, using two different approaches.
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Which set of ionic compounds?

Devise a procedure to identify four solids and then use this to carry out the identification.
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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 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 chloride

Devise experiments to determine which of five solids is the chloride by using chemicals and apparatus in the laboratory.
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Detergency

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 or characteristics that are the same for all four complexes.
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Amount of CO₂

By using chemicals and apparatus in the laboratory, devise experiments to determine the amount of carbon dioxide that can be obtained from a mixture of two solids - barium sulphate and potassium carbonate.
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A weak acid

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

Label five white solids correctly by using chemical tests and any suitable apparatus.
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Vegetable oils as fuel

2016-05-16T10:43:00Z In association with Twig World

Discover the processes involved in using vegetable oil as a biofuel. Could it become a viable alternative to fossil fuels?
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Tales of the riverbank: environmental

This problem-based case study looks at the environmental problems found within the fictitious Coley River system in the county of Midshire. The environmental problems found in the river are organic, inorganic and physical in nature.