IB DP Chemistry: SL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: SL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: SL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: SL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: SL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 ...
IB DP Chemistry: SL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: SL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...
IB DP Chemistry: SL复习笔记4.1.1 Forming Ions
Forming Ions As a general rule, metals are on the left of the Periodic Table and non-metals are on the right-hand side Ionic bonds involve the transfer of electrons from a metallic element to a non...
IB DP Chemistry: SL复习笔记3.2.3 Periodic Trends: Group 17 - The Halogens
Halogens The halogens These are the group 17 non-metals that are poisonous and include fluorine, chlorine, bromine, iodine and astatine Halogens are diatomic, meaning they form molecules of two ato...
IB DP Chemistry: SL复习笔记3.2.2 Periodic Trends: Group 1 - The Alkali Metals
Alkali Metals The group 1 metals The group 1 metals are called the alkali metals because they form alkaline solutions with high pH values when reacted with water Group 1 metals are lithium, sodium,...
IB DP Chemistry: SL复习笔记3.2.1 Periodic Trends: Oxides Across a Period
Oxides Oxides across a period The acid-base character of the oxides provides evidence of chemical trends in the periodic table The broad trend is that oxides change from basic through amphoteric to...
IB DP Chemistry: SL复习笔记3.1.6 Periodic Trends: Chemical
Metallic & Non-metallic Periodic trends can also be seen in the typical properties of metals and non-metals which are summarised below: The typical properties of metals and non-metals The typic...
