Thursday, 2 February 2017

Tuesday, 21 February 2012

Monday, 20 February 2012

EXPERIMENT LEAD BROMIDE

Students..

Here I attach the EXPERIMENT that related to electrolysis in molten state

EXTRA NOTES IN ELECTROLYSIS

Hi students,,

Here is an extra NOTES for your revision!!
Enjoy...Study Smart students,,

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!!!

Wednesday, 8 February 2012

STUDENTS!! ATTENTION!!

CHEMISTRY QUIZ...

Assalamualaikum my dear students.

The CHEMISTRY QUIZ will to be held on:

FRIDAY 10 the February 2012
8 PM- 9.30 PM

Be prepared and be there! :)

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!!!




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

+àK

Sodium chloride

Chlorine gas

Zinc bromide

à+



Electrolysis of aqueous solution

Water is the solvent for the ionic compound.

Therefore , aqueous solution salt have two set of ions :

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.



Power Point Presentation

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.Battery is the electrical source.

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