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  • smarttuition.sg's Avatar
    439 posts since Jan '11
  • Moderator
    H2 Chemistry @ BedokFunland JC (near VJC & TJC)
    UltimaOnline's Avatar
    11,863 posts since May '05
  • Moderator
    H2 Chemistry @ BedokFunland JC (near VJC & TJC)
    UltimaOnline's Avatar
    11,863 posts since May '05
  • TIB987K's Avatar
    1,632 posts since Oct '12
  • Moderator
    H2 Chemistry @ BedokFunland JC (near VJC & TJC)
    UltimaOnline's Avatar
    11,863 posts since May '05
    • Originally posted by ramsey tang:

      Hi! This is a relatively general question but how do I predict the products of inorganic reactions given the reactants and I am asked to balance such a reaction equation? Is there a thought process to deduce the products? E.g a reaction between Fe2O3 and CO. Thanks!


      There is no shortcut to predicting products. You've got to apply all your chemistry knowledge from across different topics to determine which (in tougher questions, more than one type of reaction is possible, hence a mixture of different products may be obtained).

      For Fe2O3 and CO, unless otherwise specified by the (eg. data based) question, otherwise at O and A levels, the only possible reaction (covered by the syllabuses) is redox, where iron is reduced and carbon is oxidized.

      Fe2O3 + 3CO --> 2Fe + 3CO2


      Originally posted by ramsey tang:

      Sorry to clarify, assuming I know it is a redox reaction, is there any way of knowing which oxidation state an element would be oxidised/reduced to in order to help predict a product? 


      For A levels, use the Data Booklet's redox potentials to determine which is the most thermodynamically feasible (ie. change in Gibbs free energy most negative), PLUS use familiarity of expected knowledge within syllabus PLUS look for clues in the question.

      For O levels, use familiarity of expected knowledge within syllabus, ie. memorize the most stable OSes and expected redox products for commonly tested compounds.

  • Moderator
    H2 Chemistry @ BedokFunland JC (near VJC & TJC)
    UltimaOnline's Avatar
    11,863 posts since May '05
    • Originally posted by ramsey tang:

      Sorry to clarify, assuming I know it is a redox reaction, is there any way of knowing which oxidation state an element would be oxidised/reduced to in order to help predict a product? 


      For A levels, use the Data Booklet's redox potentials to determine which is the most thermodynamically feasible (ie. change in Gibbs free energy most negative), PLUS use familiarity of expected knowledge within syllabus PLUS look for clues in the question.

      For O levels, use familiarity of expected knowledge within syllabus, ie. memorize the most stable OSes and expected redox products for commonly tested compounds.

  • SMB42P's Avatar
    4,996 posts since Jan '12
    • 280517 (Sunday)

      67:
      SG1705G
      SMB5024J
      SG5597A
      SMB8020A
      Unknown USB A95

      172:
      TIB1153T
      SG5065T
      SG5135A

      188:
      SG5046Z
      SG5049R
      SG5152A
      SG5454D
      SG5800M (perm?)

      188R:
      SMB3130Z
      SMB3133R
      SMB3134M

      190:
      SMB1649H (975-190-32)
      SMB3601G
      SG5577H

      300:
      TIB1036Z
      SMB1376U
      SMB1570A
      SMB1591P
      SG1709X

      301:
      SMB83X
      SMB117H
      SMB1409J
      SMB1443J
      SG1714E (still perm?)

      302:
      TIB1062Y
      TIB1238H (still perm?)
      SMB1410D
      SMB1583M (AM by 307 Malay S BC)
      SG1711M (perm?)
      SG1712K

      307:
      SMB252A (307-307-1) >> 340D slot
      SMB1485M (307-307-7)

      **SMB310R (307-307-3), SMB311M (307-307-2 >> 312K slot), SMB312K (307-307-4 >> 311M slot), SMB313H (307-307-5), SMB315C (307-307-6)

      308:
      SMB53H
      SMB133K

      927:
      SMB3159S

      975:
      SMB251C
      SMB1447Z
      SMB1467R
      SG1708Z
      SMB3088M (still perm?) (975-975-17)

      975B:
      TIB1035B

      979/979M:
      SMB1418H (979M)
      SMB1646R

      983:
      SMB1511X
      SMB1594G

      985:
      SMB22Y
      SMB116K
      SMB1582R
      SMB1641D
      SG5132H
      SMB5890A

  • qdtimes2's Avatar
    253 posts since Jun '09
    • ... higher? Why is ths so? Does that mean that ppl who enter Biz Acct in NUS is mostly frm those good JCs like Raffles, HCI etc? You basically learn stuffs in NUS and NTU Biz/Acct. Going under Accountancy does not mean that you cannot go to Finance. ...

  • ramsey tang's Avatar
    3 posts since May '17
    • Sorry to clarify, assuming I know it is a redox reaction, is there any way of knowing which oxidation state an element would be oxidised/reduced to in order to help predict a product? 

  • SBS8478D's Avatar
    2,611 posts since Apr '15
    • Cameo 28/5
      SBS8731Y 5 (BNDEP 81)
      SBS8828C 22 (AMDEP SP)
      SBS8966L 25 (AMDEP SP)
      SBS8729E 28 (BRBP 131)
      SBS8963U 59 (AMDEP 265)
      SBS6054G 60 (HGDEP SP)
      SBS8766Y 60 (HGDEP 63)
      SBS8279L 70M (AMDEP 24)
      SBS6869Y 87 (HGDEP 112)
      SBS6243C 93 (ARBP 273)
      SG1155T 103 (HGDEP SP)
      SBS8381Z 116 (HGDEP 60)
      SBS8779K 133 (AMDEP SP)
      SBS6816A 153 (HGDEP 159)
      SBS6616K 156 (HGDEP SP)
      SG1175K 156 (BBDEP 33)
      SBS5211B 157 (BRBP 238)
      SBS8496B 157 (BRBP 238)
      SBS5228D 159 (HGDEP 100)
      SBS8236K 159 (HGDEP 156)
      SBS8511R 159 (HGDEP SP)
      SBS6782M 161 (HGDEP 63)
      SG5402D 161 (HGDEP 147)
      SBS6789U 315 (HGDEP 103)

      SMB3112B 61 (KJDEP 983)
      SG5580Y 67 (KJDEP 188)
      TIB1116B 67 (KJDEP 188)
      TIB1128S 176 (KJDEP 184)
      SG1047Y 854 (AMDEP SP)
      SMB3573D 854 (AMDEP 857)
      TIB1136T 854 (AMDEP SP)
      SMB3108P 855 (AMDEP 803)
      SMB335U 963R (AMDEP 858)
      SMB1638P 970 (KJDEP 922)
      SMB1582R 985 (KJDEP 307)

      SBS3346J 66 (BUDEP SP)
      SBS3381G 66 (BUDEP SP)
      SBS3401H 66 (BUDEP 143)
      SBS3412B 66 (BUDEP SP)
      SG5001C 66 (BUDEP SP)
      SG5006P 66 (BUDEP SP)
      SG5011Z 66 (BUDEP SP)
      SMB3057C 77 (BUDEP SP)
      SMB3064G 77 (BUDEP 106)
      SMB3038H 173 (BUDEP SP)
      SMB3047G 173 (BUDEP SP)
      SMB3051T 173 (BUDEP SP)
      SMB3034T 941 (BUDEP SP)
      SMB3048D 941 (BUDEP 173)
      SMB3070M 941 (BUDEP 106)
      SMB3029J 947 (BUDEP SP)
      SMB3030D 947 (BUDEP SP)
      SMB3061P 947 (BUDEP SP)

      SBS6435R 17 (LYDEP SP)
      SBS1Z 43 (LYDEP SP)
      SBS6K 43 (LYDEP SP)
      SBS3318R 43 (LYDEP SP)
      SBS3435K 43 (LYDEP SP)
      SBS3445G 43 (LYDEP SP)
      SBS3465Z 43 (LYDEP SP)
      SBS3509G 43 (LYDEP SP)
      SBS3510B 43 (LYDEP SP)
      SG5090U 62 (LYDEP SP)
      SG1191M 82 (LYDEP SP)
      SBS3491Y 83 (LYDEP SP)
      SBS6515T 119 (LYDEP SP)
      SBS6546D 119 (LYDEP SP)

  • SBS8478D's Avatar
    2,611 posts since Apr '15
    • Cameo 27/5
      SBS3018G 10 (BBDEP 166)
      SBS6223K 10 (BNDEP SP)
      SBS6794D 10 (BNDEP SP)
      SBS6883E 10 (BNDEP SP)
      SBS6249L 16 (BNDEP CT18)
      SBS6574Y 16 (BBDEP SP)
      SBS6740J 30 (BNDEP SP)
      SBS6567T 31 (BNDEP SP)
      SBS8907H 32 (BNDEP 293)
      SBS8237H 33 (BBDEP 170)
      SBS8310D 33 (BBDEP 10)
      SBS8576D 33 (BBDEP 201)
      SBS6800U 40 (BNDEP 9)
      SBS3721J 46 (BNDEP 47)
      SBS3969L 46 (BNDEP 47)
      SBS3787U 47 (BNDEP 81)
      SBS6040X 48 (BBDEP 175)
      SG1168G 48 (BNDEP SP)
      SBS3660B 51 (SLBP 179)
      SG5352P 196 (BNDEP SP)
      SG5377T 196 (BNDEP SP)
      SBS7558M 197 (SLBP 174)
      SG1101Z 197 (BNDEP 222)
      SBS6787A 401 (BNDEP SP)
      SBS6793G 401 (BNDEP SP)
      SBS6795B 401 (BNDEP SP)
      SBS6796Z 401 (BNDEP SP)

      TIB1127U 854 (AMDEP SP)
      SG5793A 966 (AMDEP SP)
      SG5794Y 966 (AMDEP SP)
      SG5798L 966 (AMDEP 963)
      SMB5045Z 966 (AMDEP 856)

      SG5069H 2 (LYDEP SP)
      SG5107G 2 (LYDEP SP)
      SBS5M 12 (LYDEP SP)
      SBS3444J 12 (LYDEP SP)
      SBS3492U 12 (LYDEP SP)
      SG5074S 12 (LYDEP SP)
      SG5078G 12 (LYDEP SP)
      SBS6417T 15 (LYDEP SP)
      SBS6439E 15 (LYDEP SP)
      SBS6487R 15 (LYDEP SP)
      SBS6563D 15 (LYDEP SP)
      SG1189X 15 (LYDEP SP)
      SBS6414B 36 (LYDEP SP)
      SBS6422C 36 (LYDEP SP)
      SBS6437K 36 (LYDEP SP)
      SBS6452R 36 (LYDEP SP)
      SBS6498J 36 (LYDEP SP)
      SBS6531X 36 (LYDEP SP)
      SBS6550R 36 (LYDEP SP)
      SBS1Z 43 (LYDEP SP)
      SBS3309S 43 (LYDEP SP)
      SBS3448Z 43 (LYDEP SP)
      SBS3456A 43 (LYDEP SP)
      SBS3505S 43 (LYDEP SP)
      SG5071A 43 (LYDEP SP)
      SG5079D 43 (LYDEP SP)
      SG5090U 43 (LYDEP SP)

  • SBS8478D's Avatar
    2,611 posts since Apr '15
    • Rides 28/5
      SGZ6084Z (Just Grab) Bedok North St 4 to Chai Chee St
      - Layover @Bethesda Cathedral -
      SBS8429X 45 Bedok North Rd to Upp Serangoon Rd
      SBS3787U 81 Upp Serangoon Rd to Serangoon Ctrl
      SBS3509G 43M Serangoon Ctrl to Sengkang East Rd
      - Layover @Compass One -
      SBS6782M 161 Sengkang East Way to Buangkok Green
      SBS1Z 43M Buangkok Green to Yio Chu Kang Link
      SBS8888D 109 Yio Chu Kang Link to Boundary Rd
      SMB33R 853C Boundary Rd to Ang Mo Kio Ave 1
      SG1147S 53 Ang Mo Kio Ave 1 to Bishan Rd
      SG1175K 156 Bishan Rd to Thomson Rd
      SBS6243C 93 Thomson Rd to Adam Rd
      SMB131R 852 Adam Rd to Bukit Batok Int
      SBS3412B 66 Bukit Batok Ctrl to Jln Jurong Kechil
      SMB123P 985 Jln Jurong Kechil to Jln Toa Payoh
      SBS8731Y 5 Jln Toa Payoh to Bedok Reservoir Rd
      SBS3401H 66 Bedok Reservoir Rd to Bedok North Ave 3
      SBS8418C 46 Bedok North Ave 3 to Bedok North Rd

  • SBS8478D's Avatar
    2,611 posts since Apr '15
    • Rides 27/5
      SBS3969L 46 Bedok North Rd to Bedok North Rd
      SBS8278P 24 Bedok North Rd to New Upp Changi Rd
      SBS3875Z 14 New Upp Changi Rd to East Coast Rd
      - Layover @Parkway Parade -
      SG5550J 134 Marine Parade Rd to Marine Parade Rd via Marine Terrace
      SBS6795B 401 Marine Parade Rd to Old Airport Rd
      - Spot Bus @Bus Stop 81171-
      SG1162Y 32 Old Airport Rd to Dunman Rd
      SBS3767C 30 Dunman Rd to New Upp Changi Rd
      SBS8660T 222 New Upp Changi Rd to Chai Chee St
      - Layover @Bethesda Cathedral -
      SBS6165U 222 Chai Chee St to Bedok North Rd

  • TIB 585L's Avatar
    8,900 posts since Apr '11
    • SMB8009J SMB8010D SMB8011B

                              AM 811 > WL 901
                              
                              Replacing 3 Habit
                              
                              SMB8013X SMB8014T SMB8008L > WL 913
                              
                              Replacing ex 8027G 8026J + 1 more bus slot
                              
                              SMB8036E SMB8015R > WL 900 for WAB
                              
                              SMB8003A SMB8004Y SMB8005U SMB8006S  > WL 912
                              
      Edited by TIB 585L 28 May `17, 10:51PM
  • EMERGENCY AMBULANCE
    QX179R's Avatar
    80,284 posts since Feb '08
  • hairycrab138's Avatar
    306 posts since Oct '10
    • Suggestion:

      When Bukit Panjang ITH opens:

      Service 75 withdrawn

      973 (Merge with 75) - Bukit Panjang Int to Marina Centre Terminal
      (Via Hillview / Hume Avenue)
      (All buses from 75 goes to enhancing Service 973 frequency)

      Svc 973 - Original
       
      Bukit Panjang Int
      Jelebu Road
      Bukit Panjang Road
      Pending Road
      Petir Road
      Dairy Farm Road
      Hillview Road
      Hillview Ave
      Hume Ave
      Upper Bukit Timah Road
      Service 75 route to Marina Centre Terminal

      Service 75 withdrawn

      Service 700 / 700A Amendment
      Service 75 original route
      Bukit Panjang Int
      Petir Road
      Service 700 / 700A original route 

      Service 176
      (Takeover 75's portion)
      Hillview Ave
      Hillview Road
      Upper Bukit Timah Road
      Cashew Road 
      Bukit Panjang Int

      Integrated Service 180 - Yishun to Boon Lay
      Service 171 - Yishun to Jelebu Road 
      Service 180 - Jelebu Road to Boon Lay Int
      (Service 171 deleted sector - Upper Bukit Timah Rd - Marina Centre Terminal)
      Deleted sector covered by Service 170/170A, 700/700A & 960.

      Service 177 dont call at Bukit Panjang Int - uses current route

      Service 184 & 920 as per normal.
       
      Service 922 (Amended)
      Bukit Panjang Int
      Petir Road
      Gangsa Road
      Bukit Panjang Road
      Bukit Panjang Ring Road
      Segar Road
      Bukit Panjang Ring Road (Greenridge Sec Sch)
      Fajar Road (Towards Fajar Shopping Centre)
      Segar Road
      Bukit Panjang Ring Road
      Bukit Panjang Road
      Gangsa Road
      Petir Road
      Bukit Panjang Int

      Service 970 turns straight to Bukit Panjang Road (Skips Gangsa Road)

      Service 972 as per normal.
      Service 975 as per normal.
      Service 979 / 979M to call at Bukit Panjang Int

      Edited by hairycrab138 28 May `17, 10:32PM
  • EMERGENCY AMBULANCE
    QX179R's Avatar
    80,284 posts since Feb '08
  • EMERGENCY AMBULANCE
    QX179R's Avatar
    80,284 posts since Feb '08
  • EMERGENCY AMBULANCE
    QX179R's Avatar
    80,284 posts since Feb '08
  • Afia291's Avatar
    1 post since May '17
    • Hi! I'm doing some simple survey about digital cameras and it would really be helpful if you could fill it out. The link is:  https://goo.gl/forms/9L0Gaeuwinbp9YY83

      I'd really appreciate your contributions in responding to the survey. Thank you.

  • NeverSayGoodBye's Avatar
    8,271 posts since May '05
    • PETALING JAYA: If you are ever in California and see a four-wheel drive go by with a “Kopi O” licence plate, relax.

      He’s not that kind of “kopi-O licence” driver Malaysians are all too familiar with, but someone showing how much he loved his time in Malaysia while announcing his favourite drink to fellow motorists.

      After returning home from a round-the-world trip, 29-year-old Scott Burkhalter decided to register the personalised plate, or vanity plate, because he developed a taste for kopi-O (black coffee) on his visit here and also as a reminder of his travels.

      “I love coffee, and since my car is black and the new vanity plate is in California’s classic black, I thought black coffee would be the most suitable.

      “Getting that in English would be fine, but I thought it would be more unique to get something related to my travel experiences. ‘Kopi O’ was the perfect choice!” said Burkhalter, a tow truck driver for a police department.

      During his 26-month trip, Burkhalter and his girlfriend visited Australia, South-East Asia, India and Europe.

      They visited peninsular Malaysia last year and wanted to leave after only three weeks as they did not feel a strong connection to the country.

      However, things changed when they were invited by outdoor travel company Radak Adventure to volunteer at the company’s guest house in Gopeng, Perak.

      “We helped prepare the Gopeng Guesthouse for its opening, worked at the riverside camp for the company, enjoyed observing Ramadan with our crew, and had plenty of kopi O,” Burkhalter said.

      “Two months went by and I grew to love Malaysia. I made lots of new friends and developed a deeper understanding of local life.”

      Radak Adventure founder Mohd Hasrol Kamis, who introduced the drink to Burkhalter, said the adventurous American drank kopi-O every morning.

      “Today he texted me. He said he just got a new car, a new job in the US, so he will put ‘Kopi O’ as his licence plate to show that he really loves and wants to come back to Malaysia,” Mohd Hasrol said.

      Burkhalter said his relationship with kopi-O was love at first taste.

      “Beverages, and how to order them, are unique to Malaysia. The first time I ordered kopi-O, I didn’t know exactly what I would get, and like all the other drinks (in Malaysia), I loved it immediately,” he said.

      After leaving Malaysia to continue his travels, he felt a need to return to Gopeng to see his friends and savour the food again before going back to California.

      “We returned to Malaysia once more before ending our long trip to see Gopeng Guesthouse open and running, and reunite with our friends, and of course indulge in the amazing food!”

      Burkhalter may have left Malaysia, but with “Kopi O” on his car, he will always have a reminder of the country with him wherever he goes.


  • sfirenze's Avatar
    154 posts since Sep '16
  • BusAnalayzer's Avatar
    10,170 posts since May '12
    • Future extension for 258

      Joo Koon Interchange >> JW St 64 (BNL MRT) >> Boon Lay Way >> Corporation Rd >> Jurong Bird Park (loop)

      ** New stops along Jalan Ahmend Ibrahim

      (1) SPH Print Center

      (2) World of Districts

      (3) Jurong Bird Park (existing where 194 calls), return via old 194 route.

      Jurong Pier Rd (express)

      (4) Ila Technologies

      Corporation Road & back.

      178

      Jurong East Interchange >> Woodlands Interchange

      ** Missing sector covered by svc 49 and svc 258.

  • Moderator
    H2 Chemistry @ BedokFunland JC (near VJC & TJC)
    UltimaOnline's Avatar
    11,863 posts since May '05
    • Top 10 Best Magicians on America's/Britain's Got Talent... the blindfolded girl clairvoyant machiam Marvel mutant... Professor X, is that you in a skirt wearing a wig? Whichever dude marries her, good luck trying to hide your extramarital affair from her...

      https://www.youtube.com/watch?v=DHz2yTHPU8c

      Edited by UltimaOnline 28 May `17, 5:24PM
  • Redvelvett's Avatar
    13 posts since Sep '15
    • Originally posted by Chemguide7:

      Can you go personally to NTU admin office and enquire?

      Decisions and deadlines have to be respected by all.

       

      Yes I understand that it was my fault for not accepting NTU in the first place .. 

      Anyw NTU admin office and hotline is only available from Mon to Fri but the appeal closes today, can I appeal to the programme that was offered to me previously first? Will they consider my appeal? :(

      Edited by Redvelvett 28 May `17, 5:19PM