IB DP Chemistry: HL复习笔记4.2.2 Shapes of Molecules
Shapes of Molecules When an atom forms a covalent bond with another atom, the electrons in the different bonds and the non-bonding electrons in the outer shell all behave as negatively charged clou...
IB DP Chemistry: HL复习笔记4.2.1 Resonance Structures
Resonance Structures The delocalization of electrons can explain the structures of some species that don’t seem to fit with a Lewis structure Delocalized electrons are electrons in a molecule, ion ...
IB DP Chemistry: HL复习笔记4.1.6 Lewis Structures
Lewis Structures Lewis structures are simplified electron shell diagrams and show pairs of electrons around atoms. A pair of electrons can be represented by dots, crosses, a combination of dots and...
IB DP Chemistry: HL复习笔记4.1.5 Bond Polarity
Bond Polarity When two atoms in a covalent bond have the same electronegativity the covalent bond is nonpolar The two chlorine atoms have identical electronegativities so the bonding electrons are ...
IB DP Chemistry: HL复习笔记4.1.4 Covalent Bonds
Covalent Bonds Covalent bonding occurs between two non-metals A covalent bond involves the electrostatic attraction between nuclei of two atoms and the electrons of their outer shells No electrons ...
AQA A Level Maths: Pure复习笔记2.7.3 Solving Equations Graphically
Solving Equations Graphically Solving (simultaneous) equations graphically This is a way to solve simultaneous equations (see Simultaneous Equations) Coordinates of the intersections are the...
AQA A Level Maths: Pure复习笔记2.7.2 Reciprocal Graphs - Sketching
Reciprocal Graphs - Sketching What are reciprocal graphs? Reciprocal graphs involve equations with an Χ term on the denominator e.g. There are two basic reciprocal graphs to know for A level...
IB DP Chemistry: HL复习笔记4.1.3 Formulae & Names of Ionic Compounds
Formulae & Names of Ionic Compounds Ionic compounds are formed from a metal and a nonmetal bonded together Ionic compounds are electrically neutral; the positive charges equal the negative char...
IB DP Chemistry: HL复习笔记4.1.2 Ionic Compounds
Ionic Lattices The ions form a lattice structure which is an evenly distributed crystalline structure Ions in a lattice are arranged in a regular repeating pattern so that positive charges cancel o...
