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Listed under:  Science  >  Matter  >  Molecular structure
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VisChem topic 14: structure and properties of carbon compounds

This web page contains QTVR objects showing aspects of the structure of selected organic molecules. The QTVR objects can be manipulated by the user so that, as well as being rotated, different ways of modelling the molecules can be seen.

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VisChem topic 6: molecular structure, shape and polarity

This web page contains ten animations of molecules and compound ions as well as nine QTVR objects showing organic molecules. The animations rotate the molecules to show their structure fully. The QTVR objects can be manipulated by the user so that, as well as being rotated, different ways of modelling the molecules can be seen.

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VisChem topic1: chemical bonding in pure substances in different states

This web page contains a collection of animations depicting copper, sodium chloride, water and oxygen at the molecular level. The animations show the arrangement of atoms, molecules and ions in solid, liquid and gaseous states as well as illustrating changes of state. Two animations demonstrate alternative methods of representing ...

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VisChem topic 9: physical properties of water

This web page contains a video, animations and a student worksheet exploring the influence of structure and bonding on the physical properties of water. Two animations showing structure and bonding in oxygen are provided for comparison.

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VisChem topic 11: dynamic chemical equilibrium

This web page contains a video, animations and a student worksheet investigating the dynamic equilibrium associated with the iron(III) thiocyanate complex. The animations show important molecular-level segments from the video.

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VisChem topic 12: acid-base reactions

This web page contains a video, animations and a student worksheet examining the proton-transfer reactions of acids and bases. Self-ionisation of water, acidity of hydrated metal ions, proton gain by ammonia molecules and proton loss from acetic acid are depicted. The animations show important molecular-level segments from ...

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VisChem topic 13: redox reactions

This web page contains a video, animations and a student worksheet investigating the redox reaction between copper metal and silver ions. The animations show important molecular-level segments from the video.

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Building models of organic molecules

Have you seen the model of long-chain carbon molecules first developed by Friedrich August Kekulé? This model enabled chemists to make a great leap forward in their understanding of the structure of organic molecules. See how to represent the structure of methane, ethane, propane, butane and octane. Find out how to rearrange ...

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VisChem topic 2: dissolution of an ionic salt

This web page contains a video clip, animations and student worksheets exploring the dissolving of ionic solids in water. The video clip has both filmed and animated scenes that compare the dissolving of sodium chloride with melting and show how the dissolving process can be represented by chemical equations. Important ...

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VisChem topic 3: precipitation of an ionic salt

This web page contains a video clip, animations and student worksheets exploring the precipitation of silver chloride. The video has both filmed and animated scenes showing the process at observational and molecular levels. It explains how the reaction can be represented by a chemical equation.

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VisChem topic 4: energy in chemical reactions

This web page contains a video and animations exploring the distribution of molecular kinetic energy in solid, liquid and gaseous water, as well as the changes in chemical energy during reactions. Four animations depict the reaction mechanisms and energy profiles involved in organic substitution reactions.

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VisChem topic 5: factors affecting the rates of chemical reactions

This website contains seven animations depicting the factors that influence rates of organic chemical reactions. Three animations explore the significance of collision orientation, two the role of activation energy and two the effects of different solvents.

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VisChem topic 7: intermolecular forces

This web page contains animations demonstrating situations in which dispersion forces, ion-dipole forces and hydrogen bonding occur. Several animations show hydrated ions, and the effect of hydration on dissolving and reaction rates is discussed in explanatory text. A document containing lesson plans and student worksheets ...

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VisChem topic 8: chemical properties of water and aqueous solutions

This web page contains video clips, animations and student worksheets that investigate the chemical properties of water and aqueous solutions. The major topics cover the structure and bonding of water, acids and bases, dissolving, ionic solutions, precipitation and complexation.

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VisChem topic 10: reactions of carbon compounds

This web page contains animations showing reaction mechanisms for organic substitution, addition and elimination reactions. For most reactions there are two animations, one showing molecular models, and the other showing structural formulas with movement of electrons as bonds are rearranged.

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What makes salt and sugar so different?

Have you ever accidentally sprinkled sugar on your dinner or spooned salt into your coffee? Those white crystals might look the same but they taste very different because they are made of different kinds of atoms bonded in different ways. Discover how chemists identify what kinds of atoms a compound is made of, then find ...

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Water molecule showing polarity

This is a colour graphic representation of a water molecule. It depicts the structural formula of water superimposed on a space-filling model and an electron-density isosurface. The diagram is colour-coded to show the dipole nature of the molecule.

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How big are extremely small objects?

Imagine how big you might be compared to an ant, a speck of dust, a molecule or an atom. Explore the world of the very small, and find out just what units scientists use to measure extremely small objects.

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Amazing materials from rearranged carbon atoms

Explore the different forms (allotropes) of the chemical element carbon. You will be surprised at how different the allotropes are.Meet key scientists, such as Harry Kroto, who have made amazing discoveries about new forms of carbon. Visualise how the atoms and outer electrons are arranged in different forms, so you can ...

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Precious metals

Why are some metals prized more for jewellery than others? Listen to presenter Bernie Hobbs explain the chemical reaction that affects the look and durability of metals. Using the periodic table and some dazzling computer graphics, Bernie demonstrates why 'oxygen-proof, low-reactivity, transition metals' such as gold keep ...