All Resource articles – Page 21

View all stories of the same content type.

  • Sea salt crystals
    Resource

    Chemistry and electricity

    Demonstrate movement of ions in solution and make coloured writing using electricity and indicators

  • Scuba diver
    Resource

    A Cartesian diver

    Use this famous experiment to illustrate the changes in density of gases and liquids when compressed

  • Image
    Resource

    Viscosity

    Compare the viscosity of treacle-like and water-like liquids

  • Ammonium vanadate in conical flask
    Resource

    The oxidation states of vanadium

    Introduce your students to the idea that different oxidation states of transition metal ions often have different colours and that electrode potentials can be used to predict the course of the redox reactions.

  • A burning splint
    Resource

    Burning milk powder

    Produce a spectacular fireball by sprinkling milk powder over a flame and witness how an increased surface area can also increase reaction rates.

  • Image
    Resource

    A visible activated complex

    A simple demonstration of catalysis also introducing the idea of an activated complex and to allow discussion of the mechanism of catalysis.

  • Red foaming reaction in conical flask
    Resource

    Hydrogen peroxide decomposition using different catalysts

    Demonstrate the effectiveness of different catalysts for the decomposition of hydrogen peroxide by assessing the reaction rate of varying mixtures of hydrogen peroxide, washing up liquid and a selection of catalysts.

  • Image
    Resource

    Competition for oxygen

    This experiment involves the reaction of a metal with the oxide of another metal. When reactions like these occur, the two metals compete for the oxygen. The more reactive metal finishes up with the oxygen (as a metal oxide). If the more reactive metal starts as the oxide then no ...

  • Image
    Resource

    Electrolysis of potassium iodide solution

    Filter paper soaked in potassium iodide solution which also contains starch and phenolphthalein is placed on an aluminium sheet which forms one electrode of an electric circuit. The other electrode is used as a ‘pen nib’ to ‘write’ on the filter paper. When this electrode is made positive and the ...

  • Image
    Resource

    An alternative to using compressed gas cylinders

    Cylinders of hydrogen, oxygen and carbon dioxide are very expensive. Getting gas under pressure allows exciting demonstrations such as igniting balloons filled with hydrogen gas.

  • Nylon thread
    Resource

    Making nylon: the ‘nylon rope trick’

    Perform this ‘trick’ with a solution of decanedioyl dichloride in cyclohexane floated on an aqueous solution of 1,6-diaminohexane. As nylon forms at the interface, it can be pulled out as fast as it is produced forming a long thread: the ‘nylon rope’.

  • Image
    Resource

    Flame tests (the wooden splint method)

    Watch this experiment in our practical video Identifying ions. The method described in this experiment is intended for students to carry out and avoids the need for the use of concentrated hydrochloric acid. It also avoids the cost and contamination problems associated with the use of nichrome or platinum wires.

  • Image
    Resource

    Neutralisation circles

    Drops of dilute acid and alkali are placed a few centimetres apart on a sheet of filter paper and allowed to spread out until they meet. A few drops of Universal indicator are then placed over the moist area of the filter paper and a band of colours showing the ...

  • Image
    Resource

    The methane rocket

    A strong plastic bottle is filled with a 2:1 ratio of oxygen to methane and the mixture ignited with the bottle standing on a suitable ‘launch pad’. The mixture ignites with a loud bang and the bottle flies several metres.

  • Image
    Resource

    Extracting limonene from oranges

    This experiment demonstrates the extraction of plant oils. The experiment also links for tests for unsaturation, and at a higher level, chirality.

  • Image
    Resource

    The effect of concentration on reaction rate

    Sodium thiosulfate solution is reacted with acid – a sulfur precipitate forms. The time taken for a certain amount of sulfur to form can be used to indicate the rate of the reaction.

  • Image
    Resource

    Diffusion of gases – a safer alternative to bromine

    Demonstration of the diffusion of gases.

  • Sand explosion
    Resource

    Making silicon and silanes from sand

    Heat magnesium and sand together to produce silicon by an exothermic reaction. 

  • Weighing a powder on a balance
    Resource

    Reduction of copper(II) oxide by hydrogen

    Determine the formula of copper(II) oxide by reducing it using hydrogen or methane.

  • Image
    Resource

    Testing for negative ions

    This activity is in two parts; first, students make observations while carrying out tests for various negative ions, then they use their observations to help identify the negative ions present in a number of solutions.