AQA A Level Biology复习笔记1.1.3 Monosaccharides
Monosaccharides: Common Examples Sugars can be classified as reducing or non-reducing; this classification is dependent on their ability to donate electrons Reducing sugars can donate electr...
AQA A Level Biology复习笔记1.1.2 Biological Molecules: Reactions
Biological Molecules: Reactions A covalent bond is the sharing of two or more electrons between two atoms The electrons can be shared equally forming a nonpolar covalent bond or unequally (w...
AQA A Level Physics复习笔记2.5.1 Collisions of Electrons with Atoms
Ionisation & Excitation Ionisation of an atom is: The removal, or addition, of an electron from, or to, an atom when given sufficient energy Excitation of electrons is: When an electron ...
AQA A Level Physics复习笔记2.4.1 The Electronvolt
The Electronvolt The electronvolt is a unit which is commonly used to express very small energies This is because quantum energies tend to be much smaller than 1 Joule The electronvolt is de...
AQA A Level Physics复习笔记2.3.1 The Four Fundamental Interactions
The Four Fundamental Interactions There are four fundamental interactions, or fundamental forces, that exist. These are: Gravity Electromagnetism Strong Nuclear (or Strong Interaction) Weak ...
AQA A Level Physics复习笔记2.2.1 Hadrons
Baryons & Mesons Hadrons Hadrons are the group of subatomic particles that are made up of quarks Therefore, hadrons can feel the strong nuclear force There are two classes of hadrons: Ba...
AQA A Level Physics复习笔记2.1.1 Atomic Structure
Atomic Structure The atoms of all elements are made up of three types of particles: protons, neutrons and electrons. Protons and neutrons are found in the nucleus of an atom while electrons ...
AQA A Level Physics复习笔记1.1.1 SI Units
SI Base Quantities There is a seemingly endless number of units in Physics These can all be reduced to six base units from which every other unit can be derived These seven units are referre...
AQA A Level Physics复习笔记1.2.1 Sources of Uncertainty
Random & Systematic Errors Measurements of quantities are made with the aim of finding the true value of that quantity In reality, it is impossible to obtain the true value of any quanti...
