# Simulations

 Image: Halacious, Unsplash, 2017.
 Link IB topic Syllabus reference Lab or potential IA? Grab bag? ​Pearson​ Stoichiometry (topic 1) ​1.3 Obtaining and using experimental values to calculate the molar mass of a gas from the ideal gas equation ​Lab - Gas laws and ideal gas equation No ​PraxiLabs​ Stoichiometry (topic 1) 1.3 Solution of problems relating to reacting quantities, limiting and excess reactants, theoretical, experimental and percentage yields ​Lab - Titrations - how to standardise a solution Yes ​ChemCollective​ Stoichiometry (topic 1) 1.3 Solution of problems involving molar concentration, amount of solute and volume of solution. ​Lab - Virtual titration Yes ​cK-12​ Atomic structure (topic 2) 2.2 Emission spectra are produced when photons are emitted from atoms as excited electrons return to a lower energy level. ​Lab - Spectral lines - Practical on emission and absorption spectra No ​PhET​ Atomic structure (topic 2) 2.1 Atoms contain a positively charged dense nucleus composed of protons and neutrons (nucleons). Negatively charged electrons occupy the space outside the nucleus ​Lab - Build an atom - Practical on atomic structure No ​University of Missouri - Gary Bertrand Bonding (topic 4) 4.1 Explanation of the physical properties of ionic compounds (electrical conductivity) in terms of their structure. ​Lab - Conductivity of solutions Yes ​ChemDoodle​ Bonding (topic 4) 4.3 Shapes of species are determined by the repulsion of electron pairs according to VSEPR theory ​Lab - 3D visualisation of structures No ​PhET​ Acids and bases (topic 8) 8.3 Students should be familiar with the use of a pH meter and universal indicator Lab - Practical on pH scale Yes ​SUNY Oneonta​ ​Acids and bases (topic 18) 18.3 Selection of an appropriate indicator for a titration, given the equivalence point of the titration and the end point of the indicator. ​Lab - Titration curves - determination of Ka by half equivalence Yes