Interference & Coherence Interference occurs when waves overlap and their resultant displacement is the sum of the displacement of each wave This result is based on the principle of superpositi...
What is Diffraction? Diffraction is the spreading out of waves when they pass an obstruction This obstruction is typically a narrow slit (an aperture) The extent of diffraction depends on the width...
Stationary Waves Stationary waves, or standing waves, are produced by the superposition of two waves of the same frequency and amplitude travelling in opposite directions This is usually achieved b...
Edexcel IGCSE Chemistry 复习笔记 4.8.3 Condensation Polymers Condensation Polymers Condensation polymers are formed when two different monomers are linked together with the removal of a smal...
Edexcel IGCSE Chemistry 复习笔记 4.8.2 Disposal of Addition Polymers Disposal of Addition Polymers Addition polymers are formed by the joining up of many small molecules with strong C-C bond...
Edexcel IGCSE Chemistry 复习笔记 4.8.1 Addition Polymers Monomers Polymers are large molecules of high relative molecular mass and are made by linking together large numbers of smaller molec...
Edexcel IGCSE Chemistry 复习笔记 4.7.2 Practical: Preparation of Ethyl Ethanoate Practical: Preparation of Ethyl Ethanoate Aim: To prepare a small sample of ethyl ethanoate Diagram: &...
The Principle of Superposition The principle of superposition states that when two or more waves with the same frequency travelling in opposite directions overlap, the resultant displacement is the...
Edexcel IGCSE Chemistry 复习笔记 4.7.1 Esters The Esters Making Esters Alcohols and carboxylic acids react to make esters in esterification reactions Esters are compounds with the functional...
