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.