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，英國的學生參加了自疫情以來的第一場線下GCSE 和 A-Level 考試。GCSE和A-Level考試是英國學子必經的“大考”，雖說這次是疫情后的首次線下考試，但是在考試難度、考試水平上考試局還是保持著一貫的水準。...
Edexcel IGCSE Chemistry 復習筆記 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 復習筆記 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...
Edexcel IGCSE Chemistry 復習筆記 1.2.1 Element, Compound or Mixture Classify an Element, Compound or Mixture You need to know the following definitions Classify an Element, Compound o...
Compound Angle Formulae What are the compound angle formulae? There are six?compound angle formulae?(also known as?addition formulae), two each for?sin,?cos?and?tan: For?sin?the +/- sign on the lef...
Edexcel IGCSE Chemistry 復習筆記 1.1.5 Practical: Investigate the Solubility of a Solid in Water at a Specific Temperature Practical: Investigate the Solubility of a Solid in Water at a Specific Te...
Edexcel IGCSE Chemistry 復習筆記 1.1.4 Solubility Solubility Solubility is?a measurement of how much of a substance will dissolve in a given volume of a liquid The liquid is called the solve...
