8月A-Level大考成績(jī)放榜，成績(jī)公布時(shí)間和查分攻略請(qǐng)收好！
此前由于疫情原因，各個(gè)國(guó)際大考相繼出現(xiàn)考試形式的更改問(wèn)題，其中個(gè)別地區(qū)的A-Level大考就因此轉(zhuǎn)換為POE或TAG形式，許多同學(xué)不免擔(dān)憂評(píng)估出分會(huì)導(dǎo)致高分通脹情況。 同學(xué)們的擔(dān)憂是否會(huì)成為既定事實(shí)？相信隨著今...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.15 Inter & Intramolecular Forces
Comparing Bonds to Intermolecular Forces Intramolecular forces Intramolecular forces?are forces?within?a molecule Ionic bonding?is the?electrostatic attraction?between?positive?(cations) and?negati...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.14 Van der Waals' Forces
van der Waals' Forces & Dipoles Covalent bonds are strong?intramolecular forces Molecules also contain weaker?intermolecular forces?which are forces?between?molecules These intermolecular force...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.13 Polarity & Dipole Moments
Polarity & Dipole Moments Electronegativity?is the ability of an atom to draw a pair of electrons towards itself in a covalent bond Electronegativity?increases?across a Period and?decreases?goi...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.12 Hydrogen Bonding
Hydrogen Bonding Hydrogen bonding Hydrogen bonding?is the?strongest?form of?intermolecular bonding Intermolecular bonds are bonds?between?molecules Hydrogen bonding is a type of?permanent dipole – ...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.10 Bond Energy & Length
Covalent Bonding: Bond Energy & Length Bond energy The?bond energy?is the energy required to?break?one mole of a particular covalent bond in the gaseous states Bond energy has units of kJ mol-1...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.9 Hybridisation
Covalent Bonding: Orbitals & Hybridisation Bond overlap in covalent bonds A single?covalent?bond?is formed when two nonmetals combine Each atom that combines has an?atomic?orbital?containing a ...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.8 Coordinate Bonding
Dative Bonding: Definition & Examples In?simple?covalent?bonds?the two atoms involved shares electrons Some molecules have a?lone?pair of electrons that can be donated to form a bond with an?el...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.7 Covalent Bonding
Covalent Bonding: Definition & Examples Covalent?bonding occurs between two?nonmetals A covalent bond involves the?electrostatic?attraction?between nuclei of two atoms and the bonding electrons...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.6 Metallic Bonding
Metallic Bonding: Definition Metal?atoms are tightly packed together in?lattice?structures When the metal atoms are in lattice structures, the electrons in their outer shells are free to move throu...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.5 Ionic Bonding Examples
Ionic Bonding: Examples Sodium chloride Sodium is a Group 1?metal It?loses?its outer electron to form a sodium ion with a +1 charge (Na+) Chlorine is a Group 7?non-metal It?gains?1 electron to form...
CIE A Level Chemistry復(fù)習(xí)筆記1.3.4 Ionic Bonding
Ionic Bonding: Definition As a general rule,?metals?are on the?left?of the Periodic Table and?nonmetals?are on the?right-hand?side Ionic?bonding?involves the?transfer?of electrons from a?metallic?e...
