Introduction to ElectroChemistry

Introduction to ElectroChemistry

View more PowerPoint from azieda86

Very Good Exercises

Here is a very interesting webpage you should go!!!

Please visit it!!!

You can try all the exercises about ElectroChemistry...

http://cikguadura.files.wordpress.com/2010/10/chemistry-perfect-score-module-form-4-set-3.pdf

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

(C) EXERCISE 3

(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				+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

6.2 (b) molten compound

View more presentations from azieda86

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