第426页-国际课程-翰林国际教育

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Edexcel A Level Chemistry:复习笔记5.4.1 Introducing Entropy

2022-09-20

Introducing Entropy You may have wondered why it is that endothermic reactions occur at all, after all, what can be the driving force behind endothermic reactions if the products end up in a...

2023年AP计算机科学A课程报名开启！社会考生也可报名

2022-09-20

AP计算机既可以作为计算机专业的导论课，也可以作为其他专业学生成为当今信息社会入门课程之一。这也是很多同学选择计算机这门科目的原因。2023年AP计算机科学A课程报名开启！社会考生也可报名~ AP计算机科学A课...

Edexcel A Level Chemistry:复习笔记5.3.4 Enthalpy of Solution

2022-09-20

Solution & Hydration Definitions Enthalpy of solution The standard enthalpy change of solution (ΔHsolꝋ) is the enthalpy change when 1 mole of an ionic substance dissolves in sufficient w...

Edexcel A Level Chemistry:复习笔记5.3.3 Polarising Power

2022-09-20

Polarisation of Ions Theoretical lattice energies assume a perfect ionic model where the ions are 100% spherical and the attractions are purely electrostatic So overall, there has a been a c...

Edexcel A Level Chemistry:复习笔记5.3.2 Born-Haber Cycles

2022-09-20

Born-Haber Cycles A Born-Haber cycle is a specific application of Hess’ Law for ionic compounds and enable us to calculate lattice enthalpy which cannot be found by experiment The basic prin...

Edexcel A Level Chemistry:复习笔记5.3.1 Lattice Energy

2022-09-20

Lattice Energy Lattice energy As with bond enthalpy, lattice energy (ΔHlattꝋ) can be expressed as a formation or dissociation process As a formation process, it is the enthalpy change when 1...

Edexcel A Level Chemistry:复习笔记5.2.8 Weak Acid - Strong Base Titration

2022-09-20

Weak Acid - Strong Base Titration In this example, strong sodium hydroxide, NaOH (aq), is being added to weak ethanoic acid, CH3COOH (aq) NaOH (aq) + CH3COOH (aq) → CH3COONa (aq) + H2O (l) T...

Edexcel A Level Chemistry:复习笔记5.2.7 Buffers

2022-09-20

Action of a Buffer Solution A buffer solution is a solution which resists changes in pH when small amounts of acids or alkalis are added A buffer solution is used to keep the pH almost const...