INDIVIDUAL REFLECTION ON P2 AS PRELIMS by Pooganeswari Siteram Pillai

Ella Suita JC2 Grace

2021-09-08 09:25:42 UTC

I have learnt to read through the questions more carefully and to pay greater attention to detail. Furthermore, I have realised the importance of answering the questions after reading them as a whole, rather than basing my answers from something I have seen in the textbook. The excruciating loss of one mark due to a calculation error is a constant reminder for me to reread the questions when reviewing my answers.

I learnt that I have to revise more thouroughly and read the questions properly.

2021-09-08 10:25:09 UTC

Justin JC2G

michelle jc 2 grace

2021-09-08 11:14:02 UTC

most of the questions were pretty straightforward in this paper but i failed to answer some. i think i need to revise more on my drawings because i have a hard time drawing curly arrow diagrams and also learn to manage my time more for this paper. i also need to memorize certain equations and learn more about the different types of bonding. i think i managed to do the calculations part but need to revise more on the pH of different substances.

Jasmine JC2T

2021-09-08 14:37:36 UTC

I realized that we must learn how to apply the theories we learnt from those lectures, textbooks, notes, etc. These things requires deep understanding.

Revised on :
- trends in group 2
- trends across the period
- curly arrow diagrams
- enthalpy change and ICE method
- structural isomerism
- carbonyl compounds’ tests

Davis JC2Grace

2021-09-08 16:19:17 UTC

I've learnt to read all questions carefully and thoroughly. I've also learnt to memorise imporant equations and drawings.

Catherine JC2T

2021-09-08 17:11:10 UTC

I learnt that I have to revise more on my periodicity and I am weak at making equations so i have to revise more on that.

Thomson JC2T

2021-09-09 06:32:24 UTC

I have to be more careful next time during calculation. I also have to remember some equations that i have forgotten. Catalysts and conditions for reaction are some other things for me to work on.

Keira JC 2 Grace

2021-09-09 16:30:42 UTC

I need to read the questions more carefully next time. When writing the equations, I learned to be more attentive to the number of moles. For calculations, I have to pay attention to obtain the correct value from the data booklet. Lastly, I need to manage my time properly to be able to finish the paper and re-check it.

Nevan kho

2021-09-10 09:45:42 UTC

Again, i lost marks for periodicty and trends of ionic crystals. Regret

Jacksen JC2T

2021-09-10 10:00:59 UTC

prelim chem P2
- work on calculation part
- equilibrium chapter revise
- More careful when drawing reaction mechanism for organic chem
- Be more careful on polymerization
- Practice calculations for enthalpy change
- Ged gud in maths

Geoffrey Jc2 Truth

2021-09-11 15:48:34 UTC

For this paper i did not do so well i believe that i should revise more and do more past year questions for the revision to familiarize with the questions in the paper 2. i should also pay more attention to the questions and what they are asking more importantly i should also put the answers in more details.

Michael JC2T

2021-09-12 00:10:29 UTC

I should revise more on bond forming and bond breaking. I should also revise more on the reaction of acidic oxides and other compounds, drawing displayed formulas, and also the equilibrium chapter.

Cleantha

2021-09-12 04:17:41 UTC

I should revise and memorise all the key concepts and the points of all the chapters and do more practices

Frederic

2021-09-12 04:46:55 UTC

For this paper i did many careless mistakes and lost a lot of marks as a result thus i should practice more by doing a lot of past year papers

Jonathan JC2G

2021-09-12 05:25:19 UTC

I made a lot of careless mistakes related with calculations, so I should revise on these types of questions more in order to avoid these types of mistakes in the future.

Jordan Jc2G

2021-09-12 05:31:00 UTC

I realised that sometimes i make a lot of careless mistakes in my calculations and i should improve on that. Moreover when drawing diagrams, I should remember to include everything. Example: displayed formula (O-H bond)

Ryan JC2Truth

ryanant2004 — 2021-09-12 07:14:22 UTC

I made a lot of careless mistakes, and I especially need to revise more on drawing displayed formula. I feel that I haven't done much practice in drawing displayed formula when I was doing the past year paper and it caused me to lose marks. I also made careless mistakes in the calculation due to the fact that I was quite in a hurry to finish the exam.

Megan JC2T

2021-09-12 08:17:35 UTC

Things I need to revise more at :
-When writing IE equations, don't forget to add state symbols.
-Practice how to write dissociation reaction of acid in water
-Be careful when calculating equations and which to subtract from.
-When drawing displayed formula that has alcohol group, you need to show the bonds between them too.

Dylan JC2G

2021-09-12 08:50:37 UTC

I have learnt to revise more on using the ICE method and writing down equations, for example, the reaction between BrCl and H2O. Moreover, I have learnt to manage my time, review the things that are important for Paper 2 and be more careful when it comes to answering the questions. Other than that, for the upcoming mocks, I believe that it is important to keep on practicing past year papers and read through the textbooks.

Elizabeth Donna Jc2 T

2021-09-12 09:35:03 UTC

- Going to the right : Atomic radius is smaller, sheilding effect constant , proton number increases , nuclear charge increase, attraction of nucleus will be stronger , making radius smaller
- Z(g) --> Z+(g) + e-
- Group 1,2,3 (metal oxide) : Giant ionic lattice , boiling and melting point higher
- SiO2 : Giant covalent , melting point higher
- P4O10 & SO3 : Simple molecular, melting point lower
- SiO2 - Giant covalent structure, Si and O bonded with strong covalent bonds . Si -> 4O atoms.
- H2SO3 (aq) <=> H+(aq) + HSO3- (aq)
- If pressure increase : look at mols , position shifted to the left to favor more molecules
- Nitrogen : Nitrogen is triple covalent bonds, high energy needed to break it
- Bond breaking : positive , Bond making : negative
- Mg : pH (6)
- Si : pH (1- 2)
- P : pH (1- 2)
- Cl2 is non polar , BrCl polar
- NaI - High mp , do not conduct electricity
- I2 - Solid , low melting, conduct electricity
- Positional isomerism : OH can be move
- Geometixal isemerism : double bond to different group (cis and trans)
- Optical isomerism : Have Chiral center
- Fehling -> Blue -> Red
- Tollen -> silver
- triiodomethane : do not have methylketone
- HCN / NaCN with acid

Practice :
- All organic chem : especially reactions and reagent
- Be careful when reading questions
- Do not over think some questions

Arwen JC2T

2021-09-12 11:08:57 UTC

I have to revise all concepts, especially those in organic chemistry. I have to revise all equations; drawing polymerisation is not a difficult skill, yet I failed in it. I also have to reflect on what I learned more when doing past papers; most - actually, all - of the concepts I failed to grasp are things we have discussed over and over in class.

Josh JC2G

2021-09-12 12:09:21 UTC

From watching the video, I've just further proven my lack of checking skills, especially with the fact that I missed out an entire question and didn't even notice 🤡. Careless mistakes are the bane of my existence. Besides that, I need to clarify my queries on the bond energies in the date booklet and when to use them. I lost marks using the wrong bond energy unfortunately

Raphael JC2 Grace

2021-09-12 12:23:26 UTC

I learnt that I struggle more in periodicity and that I have to study more to achieve the best I can.

Ashley JC2G

2021-09-12 12:31:34 UTC

I learnt that periodicity is a lot more harder than I thought it was??? The devil is in the details, especially Group 2 pHs. Questions of salts are definitely No 1 Public Enemy, and I should definitely be less overly confident when answering organic chemistry testing questions.

Jennifer JC2G

2021-09-12 12:45:43 UTC

I learnt that I should revise more on how to draw diagrams. I knew how to do curly arrow diagram but couldn't draw the formula so I lost a lot of marks. I was also unable to draw the polymer because I couldn't draw the formula.

I need to read the questions properly and make sure my answer matches what is asked in the questions

Angela JC2G

2021-09-12 12:50:27 UTC

From this prelims paper, I learned that I should manage my time better so that I can recheck my answers, avoid careless mistakes and remember to go back and answer questions I skipped. I need to revise more on calculating equilibrium questions, forming equations (for example the reaction between BrCl and H2O), practice and do more questions, and also read questions carefully.

Chris JC2T

2021-09-12 12:53:42 UTC

- In the first, second, ..., ionization energy, the atom must be in gaseous form.

- Calcium Carbide (CaC2) is a solid.

- Na4SiO4 is a compound.

- When an acid with more than one H atom dissociates in water, only one H atom will be removed.

- How to draw the bonding for an azide ion.

- Carbon Monoxide has a triple bond.

Yeewen JC2T

yeewenpoh — 2021-09-12 13:09:38 UTC

-Remember to write state symbol for equation of ionisation energies.

-I should also read more on real life applications of chemical compounds.

-Be careful when calculating and not leave out any values that should be considered.

-Try to remember all the bonds and structures.

I need to practice drawing the chemical structures and also practice more on identifying the mechanism of the reactions

Lindsay JC2G

mwm6s5yc99 — 2021-09-12 13:23:24 UTC

For this prelims, I learned that I should try to not spend too much time on earlier questions since I tend to not have enough time for the last few questions. Because of this, I don’t have enough time to check my answers and I end up getting minus points for that. A lot of my methods to do the paper was also inefficient and I think I should have revised more

Benedict JC2T

2021-09-12 14:46:24 UTC

From the prelims, i've learnt that i really need to polish up on some chapters. I aslo need to analyze the question carefully to scavaneg for any hints that it might give me so i can get the answer easily. Careless mistakes were also made which i will hopefully resolve.

Nicholas JC2Truth

2021-09-12 15:24:07 UTC

- BrCl + H2O -> HCl + HOBr
- Carbon monoxide -> C≡O
- Practise more on questions that uses ICE & Partial Pressure

Earlene JC2G

2021-09-12 16:48:05 UTC

Through this paper, I learnt that it would be in my best interest to practice on more past year papers so that I may learn to apply more of what I have learnt. I tend to struggle with the things that are not found in the book which proves that I have not actually fully mastered the topics being taught. I also realised that I made a lot of careless mistakes along the way (inputing the wrong enthalpy value when calculating, not drawing the bond in OH in displayed formula, etc.) I think I need to improve on the speed at which I answer questions so that I will have more time to answer the paper better as I realised that the lack of time towards the end made me commit a lot of careless mistakes which sadly cost me a lot of marks. I need to review more on periodicity and equilibrium as well.

Kevin JC 2T

2021-09-13 00:30:30 UTC

I learnt that i still need to do more practice and memorize more on reaction related to salts.

Wilson

2021-09-13 03:46:22 UTC

From this paper, I also plenty of careless mistakes. I need to memorize the equations of organic chemistry as I usually doubt my answers. I also need to memorize other equations, properties and trends.

Audrey JC2T

2021-09-13 06:33:19 UTC

From Paper 2, I learnt that I have to learn more about how to write equations such as BrCl + H2O -> HCl + HBrO. I need to analyse the questions more clearly in order to write the correct points. I should also do the questions slowly as I am careless, and that I should process my thoughts first before writing answers. Since I have been doing a lot of past papers, I felt as if my answering skills have improved as I have a better understanding on how to answer the questions. For the upcoming mocks, I should revise on more past papers and memorise and understand how to draw mechanisms, trends and tests and theories.