This collection of over practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Sometimes performance does not reflect understanding. Connect your curriculum teaching on materials to engaging sustainability contexts. This topic web suggests classroom activities linked to sorting plastics for recycling and melting plastics for new uses.
Connect your curriculum teaching on water and the water cycle to engaging sustainability contexts. This topic web suggests classroom activities on pollution in the water cycle, how water is cleaned and how we can use less of it. Use this practical to investigate how solutions of the halogens inhibit the growth of bacteria and which is most effective. Site powered by Webvision Cloud. Skip to main content Skip to navigation. Additional information This is a resource from the Practical Chemistry project , developed by the Nuffield Foundation and the Royal Society of Chemistry.
Level years years years. Use Practical experiments. Category Compounds and mixtures Properties of matter Rates of reaction. The same amount of energy is transferred in each case. AQA Combined science: Synergy 4. AQA Combined science: Trilogy 5.
Edexcel Chemistry Topic 4 - Extracting metals and equilibria Reversible reactions and equilibria 4. For elements in the fourth period of the periodic table or above, you only need to focus on three types of orbitals, namely, s, p and d.
To get a feel for the shape of these orbitals, see the link in the resources section. It has nine electrons in its outermost energy level or shell; these so-called valence electrons all occupy 3d orbitals. The water molecules and sulfate ions are attracted to the positive charge on the copper ion, so they approach it and arrange around it in an octahedral configuration.
Ultimately, then, two of the five 3d orbitals have increased energy; these are called the eg orbitals. The other three, by contrast, have decreased energy and are called the t2g orbitals. A photon of light will be absorbed by the coordination complex if it has an energy equivalent to the difference between the state an electron now occupies and the energy of another state available to it. Consequently, the copper sulfate complex can absorb photons of light with energies equivalent to the difference in energy between t2g and eg orbitals.
As it happens, the difference in energy for the copper sulfate complex is equivalent to the difference in energy for photons of light in the red-orange region of the spectrum. Since reddish light is absorbed while blue light is transmitted, the copper sulfate appears blue. When the copper sulfate dissolves in water, the copper and sulfate ions dissociate.
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