Edexcel IGCSE Maths復(fù)習(xí)筆記 2.5.1 Rearranging Formulae - Basics Choosing a method There are lots of different ways of remembering what to do when rearranging formulae – every teacher (and student) ...
Edexcel IGCSE Maths 復(fù)習(xí)筆記 2.4.4 Factorising Quadratics - General What is a quadratic expression? A quadratic expression looks like this:ax2?+ bx + c (as long as a ≠ 0) Note: If there are any hig...
Inorganic Ions An?ion?is an atom (or sometimes a group of atoms) that has an?electrical charge An ion that has a?+ve charge?is known as a?cation An ion that has a?-ve charge?is known as an?a...
Water in Cells Water is of great biological importance. It is the medium in which all metabolic reactions take place in cells. Between 70% to 95% of the mass of a cell is water As 71% of the...
Edexcel IGCSE Maths 復(fù)習(xí)筆記 2.4.3 Difference of Two Squares What is the difference of two squares? A “Difference Of Two Squares” is any expression in the form p2?– q2 Why is it so important? It co...
Hydrolysis of ATP Energy released during the reactions of respiration is transferred to the molecule?adenosine triphosphate?(ATP) ATP is a small and soluble molecule that provides a?short-te...
Evaluating the Watson-Crick Model Watson and Crick were two scientists who worked together to confirm the double-helix structure of DNA in 1953 Watson and Crick also came up with a model by ...
Edexcel IGCSE Maths 復(fù)習(xí)筆記 2.4.2 Factorising Quadratics - Harder What is a quadratic expression? A quadratic expression looks like this:ax2?+ bx + c (as long as a ≠ 0) Note: If there are any high...
Maths Skill: Frequency of Bases All DNA nucleotides contain the same phosphate group and deoxyribose sugar. The nitrogenous?base?attached to the sugar can vary between nucleotides There are?...
