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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.

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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.

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

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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.

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

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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

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-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

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- 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.

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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.

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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

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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.

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

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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

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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.

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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.

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- 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

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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.

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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.

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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)

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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.

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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

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

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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.

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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.

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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

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

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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.

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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.

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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.

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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.

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

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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

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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.

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

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

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Justin JC2G

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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.