3.1 Relative Atomic Mass & Relative Molecular Mass https://youtu.be/JV5lu_swnlw 3.2 Mole Concept https://youtu.be/wwUOxtnGsGY Mole and Mass: https://youtu.be/pFKEkIXXndE Mole and Volume of gas: https://youtu.be/4m4ffObgHY8 Problem solving Mole – mass – volume – particles : https://youtu.be/oOrr0Q-t3QY 3.3 Chemical Formula: https://youtu.be/FS3LzMeKguI Ionic Formula https://youtu.be/LaYMM91tlB0 Molecular Formula https://youtu.be/W77YHhIMK1g Empirical Formula of MgO https://youtu.be/X1pexe0GImI 3.4 Chemical Equation: Writing a balance Chemical Equation https://youtu.be/Z91UN19RQM0 Problem solving https://youtu.be/p-vQelLn0pE Chemical reactions frequently involve both solid substances whose mass can be measured as well as gases for which measuring the volume is more appropriate. Stoichiometry problems of this type are called either mass-volume or volume-mass problems. mass of given→moles of given→moles of unknown→volume of unknown(12.6.1) volume of given→moles of given→moles of unknown→mass of unknown(12.6.2) Because both types of problems involve a conversion from either moles of gas to volume or vice-versa, we can use the molar volume of 22.4L/mol provided that the conditions for the reaction are STP. ... https://www.youtube.com/watch?v=oOrr0Q-t3QY

In chemistry and physics, activation energy is the energy which must be provided to a chemical or nuclear system with potential reactants to result in: a chemical reaction, nuclear reaction, or various other physical phenomena. The term Activation Energy was introduced in 1889 by the Swedish scientist Svante Arrhenius. ... https://www.youtube.com/watch?v=q9TBlKdjgTo