STUDENTS!!
Let's sing a song together...laalaalaalaalaa
Tuesday 21 February 2012
Monday 20 February 2012
Wednesday 15 February 2012
IMPORTANT!! ANNOUNCEMENT!!
Hi Students;
An Educational Trip to Rembau Crystal Sdn. Bhd will be organized by Chemistry Unit..
The trip will be going to Rembau Crsytal Sdn. Bhd to learn how to sysntesis crystal.
The trip will be on 14 April 2012 and bus will leaving the school at 9.30 am.
Those who are interested, please give your name to your chemistry teacher before next week…
The seat is very very limited….HURYY UP GIVE YOUR NAME!!!
Tuesday 14 February 2012
ANNOUNCEMENT!!!
Hi students....
Extra class for coming monthly examination will be held as below:
Date : 16/2/2012
Time : 8.30 pm
Place : Class 505
Hope to see u there…
Wednesday 8 February 2012
STUDENTS!! ATTENTION!!
CHEMISTRY QUIZ...
Assalamualaikum my dear students.
The CHEMISTRY QUIZ will to be held on:
The CHEMISTRY QUIZ will to be held on:
FRIDAY 10 the February 2012
8 PM- 9.30 PM
Be prepared and be there! :)
Tuesday 24 January 2012
Sunday 22 January 2012
Very Good Exercises
Here is a very interesting webpage you should go!!!
Please visit it!!!
You can try all the exercises about ElectroChemistry...
Some Interesting EXERCISES
Here are some EXERCISES that can help you to study in more details about this topic...
Hope it will help you in studies!!!
(A) EXERCISE 1
(B) EXERCISE 2
(D) EXERCISE 4
Note:Electrolysis of molten compound
Electrolysis of molten compound
 | |||
1.All feely moving ions in molten : ______________________ , ______________________
2.When complete circuit , ________ ion move to the cathode and ____________ ion move to
the anode.
3.At the cathode, lead (II) ion accept 2 electron to form lead atom.
Half equation :___________________________________________________________
4. At the anode , bromide ion release 1 electron to form bromine atom. Two bromine atom
combine to form bromine gas.
Half equation :_______________________________________________________________
5.Overall equation : _____________________________________________________________
6.
| Electrode | Observation | Product |
| Anode | ____________ gas. | Bromine gas |
| Cathode | _____________ solid deposited | Lead atom |
7. Please complete the following table.
| Electrolyte (molten) | Substance formed at | Half equation at | ||
| Anode | Cathode | Anode | Cathode | |
| Aluminium oxide | | Aluminium | | |
| Potassium iodide | | | |
|
| Sodium chloride | Chlorine gas | | | |
| Zinc bromide | | |
| |
Electrolysis of aqueous solution
Water is the solvent for the ionic compound.
Ions from salt solution
Ions from water
Which ion is chosen to be discharged ?
Factors that affect the electrolysis of aqueous solution
(i) Position of ions in the Electrochemical Series.
Note:Electrolysis
Electrolysis
Definition :
1.Electrolysis is a process whereby compounds in either molten or aqueous state are broken down into their constituent by passing electricity through them.
2.The electrolysis cell is the set of apparatus needed to conduct electrolysis.
It should consist of the followings:
* battery
* an electrolyte
* two electrodes
 |
3.
4.The electrode which is connected to negative terminal of an electric source is called the cathode while the electrode which is connected to the positive terminal of an electric source is called the anode.
5.Electric current flow from the positive terminal of batte
ry to anode then to cathode through electrolyte and back to negative terminal of battery.
6.Observation : Deflacted of ammeter needle.
Electrolysis process have 2 types :
(a) Electrolysis of molten compound
(b) Electrolysis of aqueous solution
Factors that affect the electrolysis of aqueous solution
Ø Position of ions in the Electrochemical Series.
Ø Types of electrode used in the electrolysis.
Ø Concentration of ions in the electrolytes.
Note:Electrolytes and Non-electrolytes
Electrolytes and Non-electrolytes
| Electrolytes | Non-electrolytes |
| Substances that can conduct electricity when they are in molten states or aqueous solution and undergo chemical changes | Non electrolytes are substances that cannot conduct electricity either in molten state or aqueous solution. |
| Examples : dilute acids and alkalis molten zinc bromide sodium chloride solution
| Examples : naphthalene, benzene alcohol tetrachloromethane |
Here are some exercises you can try...Enjoy and have fun !!!
Classify the following into electrolytes and non-electrolytes.
(a). Hydorchloric acid:_______________
(b). Ammonia solution:_________________
(c). Glucose solution:________________
(d). Solid sodium chloride:______________
(e). Molten lead:____________________
(f). Zinc sulphate solution:______________
Note:Electrochemistry
Hi everyone!! Welcome to this page. Here you will be able to learn about electrocehmistry in a very attractive and simple way.
ELECTROCHEMISTRY
To investigate interchange between chemical energy with electrical energy.
Chem Term
| Terms | Definition / Meaning |
| Electrolyte | substances that can conduct electricity when they are in molten state or aqueous solution and undergo chemical changes |
| Non- Electrolyte | substances that cannot conduct electricity either in molten state or aqueous solution. |
| Electrolysis process | a process whereby compounds in molten or aqueous state are broken down into their constituent elements by passing electricity through them. |
| Electrode | A conductor ( wire/rod/plate) which carry electric current in and out of an electrolyte during electrolysis. |
| Anode | An electrode which is connected to the positive terminal of an electric source |
| Cathode | An electrode which is connected to the negative terminal of an electric source |
| Cation | A positive charged ion |
Subscribe to:
Posts (Atom)