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Viewing 15 posts - 16 through 30 (of 104 total)
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  • #1875

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi All A-Level/JC/H2/H1 Chemistry Students

    We have completed the final week revision on physical and organic.

    Topics covered as follow:
    Chemical Bonding
    Reaction Kinetics
    Chemical Eqm
    Ionic Eqm
    Electrochemistry
    Elucidation 2 and 3

    All the Best for your coming Mid Year Exam
    From Alvin and Mr Ong

    #1896

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi All A-Level/JC/H2/H1 Chemistry Students

    In the month of July, we will be revising on physical chemistry on the first three week and the last will be revising on Organic Chemistry

    This week we will be revising on Atoms, Molecules, Stoichiometry. Redox and Gases

    JC/H2/H1 Chemistry Tutor Singapore

    #1988

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi All A-Level/JC/H2/H1 Chemistry Students

    Catalyst

    A catalyst is a substance that increases the rate of a chemical reaction without itself being chemically changed at the end of the reaction

    Characteristics of the catalyst:
    1. Required in small amounts
    2. Do not affect the enthalpy change of the reaction
    4. Increase the rate constant of the reaction.
    5. Accelerates the reaction, rather than initiate it.

    An autocatalyst is a product of a chemical reaction which is capable of acting as a catalyst for the reaction.

    A homogeneous catalyst exists in the same phase as the reactants

    A heterogeneous catalyst exists in a different phase from the reactants.

    Cheers! From A-Level Chemistry Tutor

    #1989

    SY Lew
    Participant

    Hi Mr Ong, I would like to request for solutions for A-level chemistry papers from 2002 to 2007. Thanks

    #1990

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi Shu Yuan

    Noted

    Cheers! From A-Level Chemistry Tutor

    #1991

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi Chu Wen

    2HI ——-> H2 + I2
    <——
    Initial – 0.5 0.5
    Change 2x -2x -2x
    Eqm 2x 0.5-2x 0.5-2x

    Kp = (PH2 * PI2)/PHI^2 = ( 0.5 – x)^2/2x = 4.44
    solving x = 0.096
    PH2 = 0.5 – 0.096 = 0.404 atm

    Cheers! From A-Level Chemistry Tutor

    #2006

    Justin Ng
    Participant

    MCQ Periodicity
    11) Nov’09/7
    12) NJC’09/H1/6 – why Ga then Ca?
    19) TJC’09/27 -∆H of vaporization graph implication?
    34) CJC’09/6 -AlF3 ionic cpd?
    49) HCI’09/14 – why not Al?
    63) MI’09/14 – Why transition metals have greater densities than Group II metals?
    67) VJC’09/36 – How to read 2nd IE Graph? all elements 1st IE ‘shift’ right from 1st IE Graph?
    76) RI’09/26- Why electronegativity between elements in each cpd do not increase?

    MCQ – Intro to Org Chem
    13) MI’09/23
    15) NJC’09/H1/17
    18) NJC/09/18
    25) RI’09/20
    26) NYJC ‘09/21
    27) AJC’09/20
    31) HCI’09/21

    RI H2 Chem Revision Tutorial: Isomerism
    Q1)
    Q4)
    Q5)
    Q7)
    Q11)
    Q12)
    Q23)
    Q24)
    Q26)
    Q30)

    #2043

    Justin Ng
    Participant

    MCQ Chemical Bonding
    ACJC’09/6
    ACJC’09/32
    AJC’09/H1’8
    CJC’09/H1/26
    CJC’09/7
    DHS’09/H1/6
    HCI/09/31
    IJC/09/32
    MI’09/H1/8
    MJC’09/H1/27
    MJC’09/31
    NJC’09/H1/7
    NJC’09/33
    Nov’09/H1/7
    Nov’09/32
    NYJC’09/H1/6
    PJC’09/H1/5
    RI’09/4
    YJC’09/H1/7

    #2129

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi All A-Level/JC/H2/H1 Chemistry Students

    Good effort for those students completed 2007 A Level papers

    Please complete 2008 A level Papers by this week.

    Contact me if you have any questions

    All the Best to the students whose are taking exam this week

    Cheers1
    From A level Chemistry Tutors

    #2140

    Justin Ng
    Participant

    MCQ Hydrocarbons
    AJC’09/25
    AJC’09/39
    AJC’09/H1/27
    CJC’09/23
    CJC’09/39
    HCI’09/26
    MJC’09/H1/17
    PJC’09/22
    RI’09/20
    RI’09/21
    TJC’09/13

    #2234

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi All A-Level/JC/H2/H1 Chemistry Students

    2012 J2 Chemistry Revision Programme start 7 Oct

    Topics Covered

    AMS Challenging Qns/Gases
    Chemical Bonding/Redox
    Reaction Kinetics
    Chemical/Ionic Equilibrium
    Chemical Energetics
    Electrochemistry
    Organic – Distinguishing Tests
    Organic -Planning
    Organic – Elucidation
    Inorganic Chemistry

    From A Level Chemistry Tutor

    #2261

    Genevieve Chia
    Participant

    Hi Mr Ong,
    Could you post the solutions for the 2010 and 2011 A level H2 Chem papers please?
    Thank you!

    #2290

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi Genevieve

    Posted

    Cheers!

    #2446

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi All A-Level/JC/H2/H1 Chemistry Students

    You are encourage to do 2012 Prelim Papers

    1) JJC
    2) YJC
    3) CJC
    4) PJC
    5) TPJC
    6) SRJC

    Cheers! From A level Chemistry Tutors

    #2507

    admin
    Member

    A-Level Chemistry Tuition Singapore/H2 Chemistry Tuition/JC Chemistry Tutor

    Hi All A-Level/JC/H2/H1 Chemistry Students

    Answers for the last min cheimistry revision

    1) O2 produced because water in excess in aqueous NaCl. Cl2 produced because Cl- in excess in conc NaCl.

    2) Cathode Reaction: 4H20 + 4e -> 2H2 + 4OH-
    Anode Reaction: 2H20 -> O2 + 4H+ + 4e

    3) Chloride is bigger in size as compared to fluorine. It is hence more
    easily polarised to form a covalent bond

    4) dative bond between nitrogen and boron

    5) maximum density of water is at 4degrees. when water cools below 4 degrees, the volume expands. The hydrogen bonds traps the molecules into a rigid 3D structure that aligns water molecules in such a way as to create huge gaps between the molecules

    Finally remember the 5Cs

    Confidence
    Concept
    Careful
    Conscious – Time
    Check

    From A Level Chemistry Tutors

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