Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 2.2.1 Group 7 (Halogens) Physical Properties The elements in group 7 are known as the halogens These are fluorine, chlorine, bromine, iodine and astatine &nb...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 2.1.2 Group 1: Reactivity & Electronic Configurations Group 1: Reactivity & Electronic Configurations The reactivity of the group 1 metals?increases?...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 2.1.1 Group 1 (Alkali Metals) How Alkali Metals React with Water The group 1 metals are known as the alkali metals They form?alkaline solutions?when they rea...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.9.4 Practical: Investigate the Electrolysis of Aqueous Solutions Practical: Investigate the Electrolysis of Aqueous Solutions Aim: To electrolyse aqueous solution...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.9.3 Writing Half-Equations Writing Half-Equations In electrochemistry we are mostly concerned with the?transfer of electrons, hence the definitions of oxid...
Edexcel IGCSE Chemistry 復(fù)習(xí)筆記 1.9.2 Electrolysis Experiments Electrolysis of Molten Compounds Lead(II) bromide is a binary ionic compound meaning that it is a compound consisting of just ...
Nuclear Radius Values The radius of some nuclei are shown in the table below: In general, nuclear radii are of the order 10–15?m or 1 fm The nuclear radius,?R, varies with nucleon number,?A?...
Closest Approach Estimate The Coulomb equation can be used to give an estimate for the radius of a nucleus When the alpha particle reaches its closest approach (to the nucleus), all of its k...
Estimating Nuclear Radius Closest Approach Method In the Rutherford scattering experiment, alpha particles are fired at a thin gold foil Some of the alpha particles are found to come straigh...
