Home   Forum   Help Search Calendar Links Login Register   **
Welcome, Guest. Please login or register.
Did you miss your activation email?
May 25, 2012, 03:07:10 AM

Login with username, password and session length
Program
EduWebTVLatih TubiLINUSManaging Challenging SchoolsGerakan Memperkasakan SekolahLDPICTL SMICTL SRMalaysian Grid for Learning (MyGfL)ProtimPPSMISIP
Recent
introduce myself
by ruslizasalleh
[Yesterday at 11:56:50 PM]
Bayaran Elaun Pedalaman
by Zulkiflee b. Sebli
[Yesterday at 10:34:14 PM]
URUSAN PEMANGKUAN PEGAWAI...
by Irin ak Banying
[Yesterday at 10:23:08 PM]
Selamat Bertugas di Pejab...
by Sia Soh Hoong
[Yesterday at 09:45:39 PM]
WARAN..WARAN..WARAN
by Dharma Harun
[Yesterday at 08:34:38 PM]
TIME BASED
by Goh Yong Juan
[Yesterday at 05:51:30 PM]
PSKPP peringkat Negeri Sa...
by Robert Anak Adam
[Yesterday at 11:53:44 AM]
Some tips for answering E...
by Mary Jane Telma Teo
[Yesterday at 09:14:15 AM]
jadual gaji ssm baru utk ...
by Zulkifle B. Abdullah
[May 23, 2012, 09:30:31 PM]
Danny Arthur (SMK DPM, Pe...
by Arthur
[May 23, 2012, 08:37:00 PM]
 

engkabang.net > Forum > Sijil Pelajaran Malaysia > 4541 Chemistry (Moderator: Jong Kah Yin) > average of reaction, solution?
Pages: [1]   Go Down
« previous next »
  Print  
Author Topic: average of reaction, solution?  (Read 1153 times)
0 Members and 2 Guests are viewing this topic.
Tay Guan Piang
SMK St. Augustine
Teacher
Veteran Member
*

Fame: 12
Offline Offline

Gender: Male
Posts: 730


Be Smart :)
« on: February 11, 2009, 07:15:58 AM »
Hi, all Chemistry teachers, i came across a question from my students about this topic? may i know which of the following solution is the right one? any sharing will be kindly appreciated.

The table shows the total volume of gas collected at regular intervals in a reaction.

Time (s)             0          30            60              90               120               150             180              210
Volume of         0.0        4.0            7.4            10.4              12.8              14.6           17.2             17.2
gas (cm3)

What is the average rate of reaction in the second minute?

Solution A

Average rate of reaction = 12.8/120

Solution B

Average rate of reaction = (12.8-7.4)/(120-60)

Among Solution A & B, which one is the right solution for the above question?
Logged
SMK St. Augustine
Elegant & Charming
Ting Tin Chung
SMK Bandar Bintulu
Teacher
Senior Member
*

Fame: 3
Offline Offline

Gender: Male
Posts: 243


Be your self...... 相信自己...一定能!!
« Reply #1 on: February 11, 2009, 11:13:20 AM »

What is the average rate of reaction in the second minute?

Solution A

Average rate of reaction = 12.8/120

Solution B

Average rate of reaction = (12.8-7.4)/(120-60)

Among Solution A & B, which one is the right solution for the above question?
[/quote]

What is the average rate of reaction in the second minute?
The answer should be solution B... pls refer to the slide i attach... hope can help u
There are 1 attachment(s) in this post which you cannot view or download
rate.ppt
Logged
Ting Tin Chung
Guru Data
SMK Bandar Bintulu 民都鲁市镇中学
Km 8, Jln Tun Hussein Onn,
97008 Bintulu
Tay Guan Piang
SMK St. Augustine
Teacher
Veteran Member
*

Fame: 12
Offline Offline

Gender: Male
Posts: 730


Be Smart :)
« Reply #2 on: February 11, 2009, 11:36:30 AM »
Thanks a lot, Mr. Ting. At least i'm not misleading the students cause the answer was provided by teachers in my school. and students got confused and they came and approaching me for seeking the right answer. 
Logged
Cosmas Smith@Amir Ridzwan
SMK Saribas
Teacher
Senior Member
*

Fame: 55
Offline Offline

Gender: Male
Posts: 375
« Reply #3 on: February 11, 2009, 11:58:35 AM »
Quote from: Tay Guan Piang on February 11, 2009, 11:36:30 AM
Thanks a lot, Mr. Ting. At least i'm not misleading the students cause the answer was provided by teachers in my school. and students got confused and they came and approaching me for seeking the right answer. 
kirim salam pada cikgu rodin sapong
Logged
saya kawan anda
Tay Guan Piang
SMK St. Augustine
Teacher
Veteran Member
*

Fame: 12
Offline Offline

Gender: Male
Posts: 730


Be Smart :)
« Reply #4 on: February 11, 2009, 12:29:09 PM »
Quote from: Cosmas Smith@Amir Ridzwan on February 11, 2009, 11:58:35 AM
kirim salam pada cikgu rodin sapong

Sure Cikgu Cosmas. I'll pass ur regards to him later.
Logged
Ting Tin Chung
SMK Bandar Bintulu
Teacher
Senior Member
*

Fame: 3
Offline Offline

Gender: Male
Posts: 243


Be your self...... 相信自己...一定能!!
« Reply #5 on: February 11, 2009, 01:56:57 PM »
Quote from: Tay Guan Piang on February 11, 2009, 11:36:30 AM
Thanks a lot, Mr. Ting. At least i'm not misleading the students cause the answer was provided by teachers in my school. and students got confused and they came and approaching me for seeking the right answer. 

You are welcome Mr Tay...   Grin Grin i will try my best to help you
Logged
Jong Kah Yin
SM Sains Kuching
Moderator
Full Member
*

Fame: 1
Offline Offline

Gender: Male
Posts: 133


Kimia
« Reply #6 on: February 11, 2009, 09:44:11 PM »
Hi,
The answer as shown in solution A is meant for average rate for the 1st 2 minutes whereas the answer as shown in solution B is average rate in / during second minute.
Rate at 2nd minute ( also known as instantaneous rate) = gradient of tangent at 2nd minute.
Try to teach students to draw a good tangent as there is a range whereby the answers will be accepted.

With regards
« Last Edit: February 12, 2009, 07:53:10 AM by Jong Kah Yin » Logged
Jong Kah Yin
Guru Cemerlang Kimia
SM Sains Kuching
082-642544 (Pejabat)
019-8899922 (HP)
Tay Guan Piang
SMK St. Augustine
Teacher
Veteran Member
*

Fame: 12
Offline Offline

Gender: Male
Posts: 730


Be Smart :)
« Reply #7 on: February 12, 2009, 06:48:54 AM »
Thank you very much, Mr. Jong. Now i know how to overcome this matter when having students with such a misconceptions.
Logged
Pages: [1]   Go Up
  Print  
« previous next »
 
Jump to:  

Search
Stats
Members
Total Members: 21259
Latest: PloloftotteHR
Stats
Total Posts: 254478
Total Topics: 21163
Online Today: 265
Online Ever: 718
(May 16, 2012, 08:58:21 PM)
Users Online
Users: 0
Guests: 112
Total: 112
PIPPBahagian Pembangunan Kurikulume-Paymente-Hasil
Powered by MySQL Powered by PHP Powered by SMF 1.1.16 | SMF © 2011, Simple Machines | Sitemap Valid XHTML 1.0! Valid CSS!
Page created in 0.126 seconds with 26 queries.