![]() ![]() Figure 1: Blank periodic table for students to use in the Introductory Investigation.3.2.1 Enthalpy changes a) explanation that some chemical reactions are accompanied by enthalpy changes that are exothermic (ΔH, negative) or endothermic (ΔH, positive) Edexcel Chemistry.Did you know that neodymium is used in microphones? Or europium in Euro bank notes to help stop counterfeiting? These are just two of the absorbing facts in our customisable app, based on our popular and well-respected Royal Society of. Ideal if you’re a student, teacher or just have an interest in the chemical sciences. This fact-filled, image-rich app is the only periodic table you need.Standard Pressure for OCR 100 kPa (kiloPascals) - this isn't precisely 1 atmosphere but previous OCR A levels have always accepted this as an answer. ![]()
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