Relationship Between Trigonometric Ratios What relationships between trigonometric ratios should I know? If you know a value for one trig ratio you can often use this to work out the value for the ...
Edexcel IGCSE Chemistry 复习笔记 1.2.5 Practical: Investigating Paper Chromatography Practical: Investigate Paper Chromatography Using Inks & Food Colourings Objective: Investigate how paper ch...
Synchronous Orbits A synchronous orbit is: When an orbiting body has a time period equal to that of the body being orbited and in the same direction of rotation as that body These usually re...
Edexcel IGCSE Chemistry 复习笔记 1.2.4 Interpreting Chromatograms Identifying Mixtures Pure substances will produce only one spot on the chromatogram If two or more substances are the same, ...
Double Angle Formulae What are the double angle formulae? The double angle formulae for sine and cosine are: These can be found in the formula booklet The formulae for sin and cos can be found in t...
今年夏天，英国的学生参加了自疫情以来的第一场线下GCSE 和 A-Level 考试。GCSE和A-Level考试是英国学子必经的“大考”，虽说这次是疫情后的首次线下考试，但是在考试难度、考试水平上考试局还是保持着一贯的水准。...
Edexcel IGCSE Chemistry 复习笔记 1.2 3 Separation Techniques Simple Distillation This is used to separate a liquid and soluble solid from a solution (e.g., water from a solution of salt wate...
Escape Velocity To escape a gravitational field, a mass must travel at the escape velocity This is dependent on the mass and radius of the object creating the gravitational field, such as a ...
Edexcel IGCSE Chemistry 复习笔记 1.2 2 Pure Substance vs Mixture Pure Substance vs Mixture In everyday language we use the word pure to describe when something is natural or clean and to whi...
