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They are printable or can be used online. Here are masses of quiz questions for age eight and upwards. Shown here is the original by Mendeleev, the usual modern one, and another six. If you thought there was only one way of organising a periodic table, these might be quite a shock. This Science Superstars site provides details about Mendeleev and his major achievement, with the discovery of periodic law and the table.įrom here you can obtain and print various formats of the table, from a blank version to ones with atomic number listed, element symbols, element names, 1991 IUPAC masses and 1997 IUPAC approved names. Further information is available on its history/discovery, how it might be made or isolated, what compounds of it are to be found, its uses, physical data, electronic data, nuclear data, biological data, geological data and structure. A puzzle 'element' is included, too.Ĭlicking on each element brings up information on its atomic number (proton number), atomic weight (mass number), group, period and block, as well as a description. This is a superb Java Applet that allows users to select various properties and then see on the periodic table, or a section of it, how they compare element to element. If it is not here, it probably does not exist. There are links here to just about everything and anything to do with the periodic table. There is a lot to look at, so do spend time well in advance to work out what would be useful. Beware the quite lengthy downloads to a browser even if you are on a broadband connection. NaCl(s) Na+(aq) + Cl-(aq)DH° = 1.9 kJ/mol TDS° = 4.6 kJ/mol DG° = -2.For a really visual periodic table, and information about it, this Royal Society of Chemistry website is hard to beat. DH 0 then DG |TDS|, then DG 0 and DS > 0, but |DH| < |TDS|, then DG < 0. If both enthalpy and entropy favour the reaction: i.e. There are three possible ways that this can happen with respect to DH and DS.

Na(s) Na(g)  Na+(g) ½ Cl2(g) Cl(g) Cl-(g) DH°sub DH°ie NaCl(s) Lattice Energy, U DH°d DH°ea DH°f Why should we care about these enthalpies? They will provide us information about the strength of bonding in both molecules and extended solids.įree Energy Change, DG = DH - TDS At STP: DG° = DH° - (298.15 K) DS° The two factors that determine if a reaction is favourable: If it gives off energy (exothermic) DH= SHproducts - SHreactants DH 0 If DG 1 and equilibrium lies to the right. Standard Enthalpy of Formation, DH°f DH° for the formation of a substance from its constituent elements Standard Enthalpy of Fusion, DH°fus Na(s) Na(l) Standard Enthalpy of Vapourization, DH°vapěr2(l) Br2(g) Standard Enthalpy of Sublimation, DH°sub P4(s) P4(g) Standard Enthalpy of Dissociation, DH°d ½ Cl2(g) Cl(g) Standard Enthalpy of Solvation, DH°sol Na+(g) Na+(aq)

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Review of Concepts Thermochemistry: Standard state: 298.15 K, 1 atm, unit concentration Enthalpy Change, DH° DH° = SH°products - SH°reactants Entropy Change, DS° Free Energy Change, DG DG = DH - TDS At STP: DG° = DH° - (298.15 K)DS°

Introductory Inorganic Chemistry What is Inorganic Chemistry?įor more information about these periodic tables visit the site where I obtained the pictures:

Www chemlab pc maricopa edu periodic periodic html