All Group work articles – Page 3

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Six solutions

Devise experiments to label six numbered solutions correctly using chemicals and apparatus in the laboratory.
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Pheromones

Suggest some chemical and physical properties of a pheromone described and answer some problems related to it.
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Paint

Calculate the thickness of a paint film and estimate roughly its thickness in titanium atoms/ions.
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Making copper

Make some copper metal starting from copper(II) nitrate crystals.
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On the acid trail

Find out and list as much information as possible about a weak acid from experimental results shown.
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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.