Class for SSCC1703 - 27/10/2020 Bonding by SHEELA CHANDREN https://padlet.com/sheelachandren/classSSCC1703_27102020 Each person have to post something. Be it a short summary of today's topic or related questions. Attendance will only be counted after you have put up a post in this Padlet. I will be reading and replying to each and every one of you after this. en-us 2020-10-26 13:18:53 UTC 2025-10-18 15:44:08 UTC hello@padlet.com SAHIZANZAIHAN BIN ISMAIL sahizanzaihan114 https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864314829 Thank you for today's lecture dr. I absolutely understand it well and able to recalling what I had learned back in matriculation. There's no question from me but I want to know whether will we learn more about hybridization especially on how to draw it ? once again thank you dr.

]]> 2020-10-27 03:53:24 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864314829 EMERALDISYAH ALIFIA WISAKSONO wisaksono https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864331396 Thank you for today's lecture dr, so for period 1-2 they can only have octet, no more no less?]]> 2020-10-27 04:05:13 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864331396 Ch'ng Zi Long https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864334175 Thank you dr for today class. I had learnt how to draw Lewis structure in a proper and faster way.

Summary:
1) Draw Lewis structure in 5 way.
2) Find shape by using VSEPR.
3) VSEPR has a notation known as AXE.
4) Bond Haber cycle is a way to find lattice energy.

Question:
1) If there is a Lewis base and a Lewis acid, it is necessary to draw an arrow to represent the sharing of the lone pair of electrons? Exp: NH4+.

2) for the Lewis structure, can we use x to represent the valence electron in another element instead of using dot? Example: I use dot to represent valence electron of O but use x to represent valence electron of H in H2O.]]> 2020-10-27 04:07:16 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864334175 CHEW ZI KHANG https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864338895 Thank you Dr. for your understandable explanation. I able to recap all the bonding topics especially for VSEPR. Trying to memorize the name of the shape asap. Thanks again!!

]]> 2020-10-27 04:10:18 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864338895 ALVIN IMRAN BIN AZIZ https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864351858 Thank you Dr. for the explanation. Most of the class today is helping me recall back what I learned in Matriculation especially the Born Haber Cycle.
Thank you again Dr.!!!]]> 2020-10-27 04:18:18 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864351858 Siti Hadijah binti Muslimun https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864379126
Thank you dr for your great explanation. I will try my best to memorize all the  name of VSEPR molecular shapes  and how to draw lewis structure.
 thank you  again dr :)]]> 2020-10-27 04:35:01 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864379126 MUHAMMAD DANISH BIN MOHD ARIF https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864380020 Thank you Dr. for today explanation 
Summary
-5 fundamental geometries that follow VSEPR: linear, trigonal planar, tetrahedral, trigonal bipyramidal, octahedral
-how to draw from lewis to VSEPR
1. Draw lewis structure 
2. Count electron domain around central atom ( bonds and lone pair)
3. Use VSEPR chart to determine the shape

Question:
1) do we need to be precise about the degree to draw the 3d shape according  to VSEPR in exam like need to draw the 140 degree using protector ruler? Or we can just draw it and label after that?]]> 2020-10-27 04:35:34 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864380020 SYAZIEMAH BINTI JASMANI https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864382362 Thankyou Dr for your explaination. 
Summary:
-can recall how ionic and covalent bond form.
-Memorize 5 steps to draw lewis structure.
-Use VSEPR chart to determine and draw shape.
-can recall the type of hybridization .]]> 2020-10-27 04:37:06 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864382362 NURFATINI NASUHA BINTI MOHD NAIM https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864384199 Thank you so much Dr for today's class. It is really helpful for me to recall it again. It is always fun to draw Lewis Structure but not when I need to remember the VSEPR chart. Do you mind sharing the best way of how did you remember it?]]> 2020-10-27 04:38:14 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864384199 WOO JOO LEONG https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864393251 Thank you Dr for the explanation and notes! I have few questions here and hope Dr can advise on that ya

1) Do we need to know how to draw the Born-Haber Cycle?

2) Can we use bond pair / lone pair of electrons instead of boding domain / non bonding domain?

3) Do we need to know how to draw the hybridisation besides of stating the type of hybridisation?

Thank you Dr !!!]]> 2020-10-27 04:43:24 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864393251 SITI RAIHANAH BINTI ROSLAN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864398975 Thank you Dr for the explanation.it really helpful. i can still remember what i learnt in matriculation college especially VSPER. 

question : 
do we have to draw the born haber cycle ?]]> 2020-10-27 04:46:37 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864398975 HANIS SAFIYAH BINTI MOHD AMIN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864402058 Thank you Dr for today's explanation. Little bit hard to remember back those shape but I will try my best to memorize it better. I have a question regarding to resonance

- how can we know which one is the better resonance ? 
and
- is it we will learn more about hybridization?

Thank you again Dr and stay safe  too ^^]]> 2020-10-27 04:48:23 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864402058 HEMLYN HENDRY https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864405442 Thank you for the lecture today doctor!!!
Summary for today:
1) Learn/recall about ionic and covalent bonds
2)Drawing lewis structure with 5 simple steps and also being able to recall the five fundamental geometry of molecular shapes.
3)I have also learnt VSEPR also known as AXE notation]]> 2020-10-27 04:50:23 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864405442 IFFAH IZZATI BINTI AZMAN iffahizzati https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864408627 Thank you Dr for today's lecture. There are lots subtopic that I already forgot, and the video really helps me to recall back all that I had learnt before. I think I have to read back those notes for me to understand better. ]]> 2020-10-27 04:52:15 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864408627 NURHANIS KHALIESAH BINTI MOHAMAD ZAMANI https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864411395 Thank you Dr for your clear explanation! I am able to recall on what I had learnt in bonding topics. The lewis structure video was extremely helpful to me.

Question
1. Is it compulsory to draw Born-Haber cycle in every question?


]]> 2020-10-27 04:53:41 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864411395 Nurul Nasyrah Bt Sahar https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864416888 Tq so much dr fr yr explanation...now i can remember what i had studied in matriculation...and i hope i can memorize back this topic especially the vsepr chart and hybridization😊]]> 2020-10-27 04:56:52 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864416888 SITI KHADHIJAH BINTI NASIR https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864419628 Thank you Dr for today lesson 
Summary for today:
- 3 types of chemical bonds ionic, covalent bond and metallic bond.
- There are 5 fudamental geometries for molecukar shape
- memorize the VSEPR chart

]]> 2020-10-27 04:58:24 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864419628 NUR HANISAH BINTI AZMAN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864432581 2020-10-27 05:05:58 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864432581 TAN JING XUAN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864432662 Thank you dr for the lesson today. After watching your lecture video I would be able to recall back everything that I had learnt in my F6 such as bonding, lewis structure, Born-Haber cycle, VSEPR and so on. Here is my questions about today's topic:
1) When we draw the lewis structure of tetrahedral shape, can we just put the surrounding atom on top-right-down-left or we need to follow the specific shape of tetrahedral?
2) Is it a must to draw the energy level arrow on the left when we draw the Born-Haber cycle?
Thank you dr again!]]> 2020-10-27 05:06:00 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864432662 SYED MUHAMMAD KHAIRI BIN SYED NORDIN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864438926 Thank you Dr for  the lesson today.
Summary for today's lesson
3 types of chemical bonds-ionic bond, covalent bond, and metallic bond.
bond haber cycle
Lewis structure and 5 fundamental geometric shape.
-VSEPR


  ]]> 2020-10-27 05:09:45 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864438926 WAN NUR ANIS FAQIHAH BINTI WAN MAT https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864445295 First of all, thank you for those explaination but here are my summary for today and also a question from me.
SUMMARY :
   There are 3 types of bond which is ionic, covalent and metallic bond. Ionic bond formed when metal transfer the electron to non metal to achieve octet , has the electrovalent bond which is strong so the boiling point and melting point is higher (>300 degree celcius). Covalent bond formed when the non metals shared the electron to achieve octet  and has lower boiling point and melting point as the covalent bond easily to break down than ionic bond. Covalent bond has two type of molecules which is non polar and polar. Metallic bond is the bond in the bond. Lewis structure has 5 steps to follow to make sure it is the right structure.
Single, double and triple bond and also lone pair count as one domain. Need to remember the VSEPR. Theres no sp4 for the hybridization.
QUESTION
1) Why for example 1 we do not need to divide by 2 for the entalphy of atomisation and meanwhile for example 2 we need to multiply with 2 ? Is it for example 2 as the final is MgCl2? And why not divide by 2 for example 1 so it will be KCl ?
Thank you and sorry cause I feel little bit confuse about it.]]> 2020-10-27 05:13:28 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864445295 NUR QISTINA IZZATI BT MOHD FITRINAZRIN POON https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864454067 Hello dr sheela ! First of all,thnk you for all of ur explanation today regarding to this chapter. To be honest, im quite slow in Lewis, VSEPR n hybridization since im in matriculation. BUT, i will try to improve myself by read a lot n do a lot. My question is : Its's important to remember the degree in the 3D structure? Thank you again.]]> 2020-10-27 05:18:27 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864454067 MUHAMMAD AKMAL AQIL BIN ROZIMAN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864461233 Thank you Dr for today's explanation
Summary for today's lesson
- 3 types of chemical bond, ionic, covalent & metallic bond
-  recall how  to draw Lewis Structure
- memorize VSEPR


Question
-Do we have to draw the hybridization or just state the type of hybridization?]]> 2020-10-27 05:22:30 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864461233 IRDINA BINTI AZUWIR irdina01 https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864469406 Summary of today's class
-3 types of chwmical bonding: ionic, covalent, metallic
- born-haber cycle
- Lewis Structure steps and rules to draw basic strtuctures of molecules
- Relationship between bond length and bond strength
- Using VSPER to get 3D shapes of molecules
- Hybridisation which is the overlapping of orbitals of opposite spin

Question: how do you draw resonance structure that summarise the multiple Lewis structure?

Thank you for the clear explaination Dr.! It helped me recall info quickly and able to keep up with your pace.]]> 2020-10-27 05:27:13 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864469406 ZULFA ANNISA BINTI MOHD NOOR zulfaa480 https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864473729 Thank you for today's lesson Dr. .What I can summarize about today lesson are there are 3 types of bonding which is ionic , covalent and metallic bond., Ionic bond form between metal and non metal while covalent bond form between non metal and non metal . I also manage to remember a little bit back about the Born- Haber cycle , how to draw Lewis structure and VSPER . Once again, Thank you for the video it is very helpful for me because I can revise back and understand more about the topic today . :) ]]> 2020-10-27 05:29:33 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864473729 AISYAH BINTI MASHURE aisyahm1 https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864546592 Thankyou dr for the explanation.
What can i conclude that
. 
1)there are three types of bonding which are
 -ionic bond between polar
-covalent bond,can be polar and non polar
-metallic bond tht only between metal 
. 
2)Lewis structure 
-has 5 steps
-some of the compounds have resonance 
-exception octet rule[having less ex B and Be & having more 3rdperiod onward]
.
3)Shape 
-VSEPR
-5 fundamental geometries 
 - linear, triginal planar, tetrahedral, trigonal bipyramidal, octahedral 
-must know bonding domain,non bonding domain 
-remember the VSPER chart 
. 
4)LEWIS - >VSEPR
Three steps
   i) draw lewis structure 
  ii) at central atom, count electron domain
 iii)draw shape by referring VSEPR chart 
. 
5)VSEPR notation *look at central atom only
AX(nobondingdom)E(nolonepair) 
. 
6)Hybridization
-orbital atom overlap form bonds 
- 7 types and its geometries
.]]> 2020-10-27 06:08:20 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864546592 TAN SIN JOE sjtan2000 https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864546639 Thank you Dr. Sheela for today's lecture.
I have a few questions here:
The slide Remember: Electron "domains" are all negatively charged so they want to spread out from each other as possible to minimize as much as possible to minimize like-to-charge-repulsion within a molecule. Doing this allows the molecule to be more stable(low energy)
1. what does the 'electron "domains" are all negatively charged means?
2. what does the "low energy" means? Is it means the more the electrons spread out, the less the repulsion within molecules, the lower the energy so more stable?
3. Is it the VSEPR chart not giving in exam?

Thank you :D]]> 2020-10-27 06:08:22 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864546639 YEE SHI WEE https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864619801 Thank you Dr Sheela for your explanation video :D
Here are the summaries of today's lesson
1. Types of chemical bonds:
-ionic bonds (transferring electrons)
-covalent bonds (sharing electrons)
-metallic bonds (very strong and can be found in metals)

2. Lewis Structure
-Follow the 5 steps to draw a basic lewis structure
-Resonance: more than 1 lewis structure can be drawn for one molecule
-There are exceptions like B(6e) and Be(4e) not obeying the octet rule

3. VSEPR 
-Memorize the VSEPR chart
-identify number of domain of central atom in a molecule to draw a 3d molecule structure

4. Hybridization
-Bonds form when orbitals of two atoms overlap]]> 2020-10-27 06:43:16 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864619801 SITI MASYITHAH BINTI MOHAMAD JAN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864668410 Thank youuu Dr Sheela for your details explainantion . 
Summary :
* 3 types of chemical bonds which are covalent , ionic and metallic bonds.
* I remembered about Born Haber Cycle and Lewis Structure.
* Types of covalent bonds which are non polar and polar molecules.
* VSEPR theory . I need to memorize VSEPR chart and molecular shapes.
*Hybridization. Bonds form when orbitals on atoms which is there are 2 electrons of opposite spin in the orbital]]> 2020-10-27 07:05:15 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864668410 SITI NAZURAH BINTI NAZARUDDIN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864688462 Thank you for today's lecture Dr. the summary for today's class:
-There are 3 types of bonding which are ionic bonding, covalent bonding and mettalic bonding. we learn about the properties and the types of those bonding.

-There are 5 steps we need to follow in order to draw a basic lewis structure. and we also learn about the exceptions to octet rule.
-determining the shape of a molecule by using VSEPR and there are 5 fundamental geometries that need to memorize.

- we also learn about the "domain" and a bit about orbital hybridization.  

]]> 2020-10-27 07:14:04 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864688462 NAURAH AFNAN BINTI KAMARUDIN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864741957 Thank you Dr. Sheela for the explanation video.I don't have any question because your explanation very clear.All the example in the slide i already have in my matriculation's note so i just need to check again.
Summary for today

-There are 3 type chemical bond
1.ionic bond(transfer electron)
2.covalent bond(share bond)
3.metallic bond(hold metal strongly)
-Lewis Structure
1.Lone pair more stronger  than bond pair
2.Draw lewis structure
Total no.of electron,least electron in the centre,put electron between atom,complete the octet on the outside,form double/triple bond if central atom do not have octet
-VSPER
5 fundametal geometries
1.linear
2.trigonal planar
3.tetrahedral
4.trigonal bipyramidal
5.octahedral

]]> 2020-10-27 07:37:00 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864741957 ROSE SYAZWANI BINTI RAMLI https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864811200 Thank you Dr Sheela for the explaination as i can recall what i have been learning from high school and foundation times.
1.Does putting the angle on the shape give us mark? What if we didn't  remember how much is the angle is?
2. Do we need to draw the Bond Haber cycle when we want toway find lattice energy?]]> 2020-10-27 08:05:41 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864811200 LIANA FAQIHAH BINTI MOHD JAFFRI https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864859211 Hello Dr . Thankyou for your explanation .What i got from the lesson today is
-There are 3 types of bonding which are covalent bonding,ionic bonding and metallic
- How to do lewis sturcture 
- Do the VSEPR chart to know the 3D shape 
-AXE notation
-Hybridazation

My question is 
1. What it means by repel ? 
2. Does we need to remember the definition of each enthalphy ?]]> 2020-10-27 08:27:09 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864859211 FOO SZE TING https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864906068 Thank you Dr. Sheela for your explanation. Your explanation is very clear.
Summary for today's lesson:
1)Types of Bonding
2) Draw Lewis structure using the 5 steps.
3) Determine the shape of a molecule using VSEPR
4)VSEPR Notation
4)Orbital hybridization

Hi doctor, I have some questions:
1) Do we need to know the ways to do Born-Haber Cycle? If yes, could you give us more practices on conducting Born-Haber Cycle.

2)Since we need to memorise the VSEPR chart, will we be asked to draw the shape of the molecule with angle or just merely the no. of electron pairs and lewis structure?

3) Sorry for asking doctor, could you share the link for hybridization in the comments? As I couldn't copy the link because it's inside the video, and when I copy the link by typing, it shows error.

Thanks again.]]> 2020-10-27 08:47:46 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/864906068 SITI AINA AISHAH BT AZIZAN https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865264850 The summary's class:
- There are 3 types of chemical bond: ionic, covalent and metalic)
-Draw the Lewis structure according to the 5 steps
-Resonance: has more than 1 Lewis structure
-Difference between bond length and bond strength
-VSEPR: identify the bonding and the non-bonding. Draw the structure by following the VSPER to get 3D structure
-Hybridisation: bond will form when the orbital of 2 atoms overlap

]]> 2020-10-27 11:51:49 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865264850 Puteri Farisah Balqis binti Erwan https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865359463 Thank you dr for today class!! 
Here is summary of today video based on my opinion 
1) Ionic bonding 
Must know how to draw haber cycle
2) Covalent bonding
3) Drawing Lewis Dot Stucture 
and exceptione of octet rule 
4) VSEPR molecular shape 

My question is do you have the ideas or formula to memorise the vsepr molecular shapes faster dr? ]]> 2020-10-27 12:28:52 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865359463 SITI NOR SYAFIQAH BT MOHAMAD https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865396524 First of all,thankyou dr for your explaination for today classes.
Summary for today's classes is
- There are three types of bonding which is ionic bonding,covalent bonding, and metallic bonding.
- How to draw Lewis structure by using 5 steps
- Shape of molecule which is 3 dimensional shape and we can find it by using VSPER
-Single,double and triple bonds counts as one domain
- The effect of lone pair
- How to write using AXE notation
-Hybridization

]]> 2020-10-27 12:40:18 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865396524 AHMAD IMRAN BIN AHMAD BASRI ahmadimran https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865574704 Thank you dr for the lecture video on the explanation of types, structure shape and the properties. From this your lecture, we can summarize that there's 3 type of bond which are covalent, ionic and metallic bond. Each of these bonds have their own unique properties. Then, we have the lewis structure. It is determined by VSEPR. There's alot to memorise on VSEPR part. I hope that with alot of exercises, ill manage to memorise the notation and name of the VSEPR shape.]]> 2020-10-27 13:24:46 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865574704 Low Jin Wei https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865917725 Thank you Dr.Sheela for the lecture video.I really enjoyed it .My summary of today :
1) ionic and covalent bond
2)drawing bond
3)VSEPR molecular shape

I'm still confusing about the how to determining the shape of a molecule.

]]> 2020-10-27 14:35:45 UTC https://padlet.com/sheelachandren/classSSCC1703_27102020/wish/865917725