Gopi Kupuchitty: Reflection on Lecture 1 by Pooganeswari Siteram Pillai https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax Please write your reflection on what you have learned for today's lesson on lattice energy, electron affinity and Born Haber cycle. Please indicate the part that you are still having trouble to understand as well. Write your name and campus at the title part so that I can get to know you better. en-us 2021-07-25 17:25:29 UTC 2026-03-15 22:59:55 UTC hello@padlet.com My reflection pooganeswaripiks https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660375104 I have learnt about definitions and how to draw a Born-Haber cycle. I am still having doubts on the trends of electron affinity but I will look at it again using the notes.]]> 2021-07-25 17:42:17 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660375104 I really enjoyed today's lecture, the examples were very clear and easy to follow. Thank you so much https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660876185 2021-07-26 07:29:30 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660876185 The explanation was very detailed and clear. Perfect learning pace especially with the inclusion of checkpoints and great examples. https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877092 2021-07-26 07:30:56 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877092 Today's lecture was a success! The lesson was very clear and I learnt a lot today. https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877165 2021-07-26 07:31:04 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877165 very clear explanations, very comprehensive. https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877285 2021-07-26 07:31:17 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877285 Very nice lecture, the method of teaching is amazing. christhen2 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877478 2021-07-26 07:31:35 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877478 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877750 Very clear voice and good explanation]]> 2021-07-26 07:32:05 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877750 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877849 Have more idea about the topic.]]> 2021-07-26 07:32:13 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877849 The explanations were clear and the the example questions was really helped us understand the topic deeper. https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877886 2021-07-26 07:32:17 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660877886 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660878097 The explanations were quite clear and I think I have a better understanding of the trends across a period and down a group :)]]> 2021-07-26 07:32:37 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660878097 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660878206 I love you sir Gopi tqqq]]> 2021-07-26 07:32:48 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660878206 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660879152 Sir you are very impressive 🤩-Josh]]> 2021-07-26 07:34:06 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660879152 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660879859 The lecture is entertaining and clear]]> 2021-07-26 07:35:16 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660879859 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660879877 amazing.]]> 2021-07-26 07:35:17 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660879877 best teaching i've ever experience, the explanations are clear and i can understand the examples https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660880231 2021-07-26 07:35:51 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660880231 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660887850 Very clear explanation about the concept, well organized, well paced, clear examples.]]> 2021-07-26 07:46:08 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660887850 PIKS_Arwen https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660918953 We were re-introduced to the definition of lattice energy and that it is mainly affected by its ionic charge (smaller charge, decreases; larger charge; increases). We reviewed the lattice energy equations of NaO, MgBr2 and MgS, the definitions of atomisation, ionisation enerrgy and electron affinity and re-emphasised the importance of the states of matter of Cl2(g), Br(l) and I2(s). I have not fully grasped the trends of ionisation energies and electron affinities and still struggle to draw Born Haber diagrams; I will look to the textbook's new version as advised.]]> 2021-07-26 08:36:47 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660918953 PIKS_Thomson https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660936938 an understandable and clear explanation about charge density, Haber-Born cycle and enthalpy changes]]> 2021-07-26 09:05:58 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660936938 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660945252 Really good teaching method. I was able to understand a lot of things ]]> 2021-07-26 09:21:34 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660945252 Nicholas T - PIKS https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660949323 Very good ]]> 2021-07-26 09:29:49 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660949323 PIK_Elizabeth Donna https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660949494 Review about :
- Atomisation
- Lattice energy : 
1. Always exo
- IE :
1.Always endo because break bond
2. Going across the periodic table : Increase , because it is held more strongly to the nucleus, harder to remove so more energy is needed
3. Going down the periodic table : decrease , because shielding effect increase, distance increase , outweigh increase in protons 
- Electron Affinity :
1. 2nd and 3rd Ea : endo, because electrons repel electrons 
2. Trend of Ea :
* Going across : more negative 
* Going down : less negative 
- How to draw Born- Haber cycle 
1.  Clockwise = anticlockwise 
- Factor effect lattice energy :
1. Smaller ionic size
2. Greater ionic charge 


Learn :
- If Cl-Cl have a bond energy of 244kJ need to divide by 2 for enthalpy change of atomization ]]> 2021-07-26 09:30:08 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660949494 PIKS_Jasmine https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660956898 Learnt :
Lattice energy - always exothermic
Ionization energy - always endothermic, across the period increases, down the group decreases 
Electron affinity - 1st —> exothermic, 2nd,3rd —> endothermic
Enthalpy change of atomization
Factors affecting lattice energy - size of ion, ionic charge
Born haber cycle - clockwise = anticlockwise

It was a pretty quick, but very detailed revision about the chapter. I still need to get used to drawing the Born Haber cycle]]> 2021-07-26 09:45:04 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660956898 PIK_Catherine https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660958318 Review on lattice energy and electron affinity. Trend of electron affinity across period (more negative)  and down the group (less negative). Explanation on how to draw a Born Haber cycle. Factors that affect lattice energy: ion size and ionic charge.
Overall the lecture was very detailed, especially with the usage of checkpoints. I still need to further learn on how to draw a Born Haber cycle.]]> 2021-07-26 09:47:39 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660958318 PIK_Kevin https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660967716 1. The reason why the 1st EA going down group 15 16 17 becomes less negative              2.   Lattice energy is always exothermic(bond forming)          3. 1st EA is endothermic, 2nd and 3rd EA are exothermic.

]]> 2021-07-26 10:04:58 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660967716 Lecture notes 1 pooganeswaripiks https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660967966 2021-07-26 10:05:35 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660967966 Quizizz pooganeswaripiks https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660968454 You can try again the quizizz until 8pm on 27/7/21]]> 2021-07-26 10:06:53 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660968454 Answer for Lecture Notes 1 pooganeswaripiks https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660969651 2021-07-26 10:09:41 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660969651 RECORDED VIDEO OF LECTURE 1 pooganeswaripiks https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660974126 2021-07-26 10:22:08 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660974126 PIKS Audrey https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660979435 I have learnt about the trends in ionization energy and electron affinity across and down the periodic table.
I have learnt how to draw and understand the Born Haber Cycle and the enthalpy change required.
I have learnt examples of lattice energy and the factors affecting it.]]> 2021-07-26 10:32:27 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660979435 Piks_Jacksen_Jc2T https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660984138 Reviewed about 

Lattice energy (examples equations trend and definition) 
Enthalpy change 
Electron affinity (as well as second and third electron affinity) 
Born haber cycle ]]> 2021-07-26 10:40:15 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1660984138 PIKS_Frederic https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661012262 Reviewed about lattice energy, enthalpy changes which are: atomisation and solution and finally electron affinity. Sir Gopi also reviewed about the trends of IE and EA going across and down the group for group 11 and 17. There was also a very simple diagram of the born haber cycle which is very easy to understand. Sir gopi marvelously explained that the charge density is essentially the reason for the amount of lattice energy. Sir Gopi also briefly explained why the 1st EA is always negative and why the 2nd and so forth EA is always positive. Overall, the lecture was a good review and I would partake in the lecture again.

I still need to differentiate faster between EA, IE and LE regarding the factors and trends]]> 2021-07-26 11:32:30 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661012262 PIKS_Nathan https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661023640 The teacher did a thorough yet clear explanation on:
1. The enthalpy reactions: Atomisation, lattice, etc.
2. Electron affinity
3.Trends of the IE and EA both going across and down the group.
4. Born-Haber cycle, which was drawn simple so it was easy to understand.
5. Charge density.

Overall it was quite an enjoyable lesson, very clear and straight-to-the-point.]]> 2021-07-26 11:54:16 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661023640 PIKS_Ryan ryanant2004 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661041727 Review on:
1. Lattice energy
2. Enthalpy changes of atomization and solution
3. Electron Affinity
4. Charge Density
5. Born-Haber Cycle

Learnt that:
-Lattice energy is always exothermic because it is bond forming
-Ionization energy is always endothermic as it breaks bond
-Factors that affect the lattice energy, which are the size of the ion and the ionic charge

Overall, the lecture was very good as it was explained in a detailed and quick manner. I was able to understand it quite  easily and have a better understanding on this topic.]]> 2021-07-26 12:27:18 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661041727 PIKS_Chris https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661128518 We have learned about:
- The enthalpy changes of atomization, ionization energy, electron affinity, lattice energy and formation.
- The trends and reasoning behind the Electron Affinity, Lattice Energy and others, including how the charge density and the factors that affect it is responsible for the trends in Electron Affinity and Lattice Energy.
- How to draw the Born-Haber Cycle and how to use it.

I am still memorizing the trends and reasoning behind the trends, as it can get a little confusing.]]> 2021-07-26 14:15:11 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661128518 PIKS_Yeewen yeewenpoh https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661166385 Learnt about:
- Lattice energy is always exothermic
-  Electron affinity can be both negative and positive, 1st electron affinity is exothermic while 2nd and 3rd electron affinity is normally endothermic.
- Electron affinity decreases along the group and increases down the period.
- How to draw Born-Haber cycle
- Born-Haber cycle is used to calculate lattice energy

I still need to review on the reasonings behind all the trends and try to be able to produce an answer instinctively as sometimes i still get confused]]> 2021-07-26 14:57:27 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661166385 PIKS_Wilson https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661172738 Today, we reviewed about Lattice energy and how to find it by drawing the Born-Haber Cycle. We learnt that Lattice energy is always exothermic. We also learnt about the Electron affinity and Ionization Energy as well as it's trends. Overall, it was a great review to our new topic that we learnt during the first week.]]> 2021-07-26 15:04:54 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661172738 BDG_Melissa https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661510466 We have learnt about lattice energy and how to draw the Born-Haber Cycle. We also learnt the factors that affect lattice energy    . We learnt that lattice energy is always exothermic. I think the lessons was very informative and it helped me review and understand the lessons better. ]]> 2021-07-27 00:39:59 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661510466 BDGS_Claire https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661511261 i love how it refreshes my memory about enthalpy change of electron affinity, lattice energy, atomisation and formation.]]> 2021-07-27 00:40:55 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661511261 https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661511869 We have learnt about the Born-Haber cycle, lattice energy, charge density and electron affinity. Clear and thorough explanations.]]> 2021-07-27 00:41:37 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661511869 PIKS_Geoffrey https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661568724 Today we reviewed about the definitions of lattice energy, enthalphy change of atomisation,   1rst ionization energy and electron affinity. We also reviewed the trend and the properties of these topics and also learnt how to calculate the born haber cycle diagram .
The lecture detailed revision about the chapter. It was clear and straight to the point. However the  drawing the Born Haber cycle is still quite difficult for me

]]> 2021-07-27 01:39:07 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1661568724 PIKS_Nicholas (Revised) https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1662099057 In this lecture, i learned:

1) the definition of lattice energy (always exothermic) + the factors affecting lattice energy (charge density = charge/volume, the higher the charge density the more negative the value)

2) the definition of standard enthalpy change of atomisation (always endothermic) + the bond energy in the data booklet is for 2 atoms, bond energy divided by 2 is the standard enthalpy change of atomisation.

3) the definition of 1st ionisation energy (1st and so on is always endothermic) + the trend of 1st ionisation energy across the period & down the group in the periodic table (increase across the period and decreases going down the group)

4) the definition of first electron affinity (1st is always exothermic, 2nd and so on is always endothermic) + the trend of first electron affinity across the period for non metals (across the period the charge increases)  + the trend of first electron affinity down the group 15,16,17 (down the group the volume increases)

5) the definition of standard enthalpy change of formation (can be exo/endothermic)

6) how to make use of the Born-Haber cycle.

I still have trouble understanding why the first electron affinity is exothermic while the second and onwards are endothermic.


]]> 2021-07-27 12:54:13 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1662099057 MLGS_JC2_Gisella https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1662428778 very clear explanation about the concept and very well paced with clear examples. ]]> 2021-07-27 20:49:06 UTC https://padlet.com/pooganeswaripiks/6mjzzh2t1ih2pax/wish/1662428778