electrochemical cells contd...

The electrodes used in the cells discussed so far, deteriorate with the passage of current and cannot offer a constant emf indefinitely. However, there was a few cells called standard cells, which can maintain a fairly constant emf over very long periods of time..

Spontaneous redox reactions are the metal displacement reactions. Therefore such reactions have been used for producing electricity. This is done by carrying out these reactions in specially designed units called electrochemical cells. An electrochemical cell..

Electrochemical Cells - The fact that chemical reactions produce electrical effects was discovered accidentally in 1791 by Luigi Galwani, professor of anatomy at the University of Bologna, Italy. He found that an electric current flowed across two dissimilar metals between which..

The fact that chemical reactions produce electrical effects was discovered accidentally in 1791 by Luigi Galwani, professor of anatomy at the University of Bologna, Ital..

A zinc rod is dipped in ZnSO 4 solution and a Cu rod in CuSO 4 solution. The Zn rod is externally connected to the copper rod through a rheostat, a galvanometer and a plug key. fig 5.10 The two aqueous solutions are interlinked through a salt bridge which is an inverted 'u' tube which is filled wit..

In general, the electrode at which reduction takes place is written on the RHS of the salt bridge and the electrode at which oxidation takes place is written on the LHS of the salt bridge. The salt bridge linking the aqueous solutions is represented by two vertical parallel lines having ions on bo..

Electrochemical Cell Electrolytic Cell It converts chemical energy into electrical energy It converts electrical energy into chemical energy It is based upon the redox reactions which are spontaneous The redox reactions are non- spontaneous an..

White Blood Corpuscles - The WBCs are larger in size than the RBCs but much lesser in number. They are different from the erythrocytes in the following aspects. a) They have no haemoglobin b) They are bigger in size c) They are nucleated and amoeboid d) They have a longer life span e) There are sev..

1) Reactive metals are placed on top (e.g., Li) and they have a great tendency to get oxidized. Non-reactive metals like Ag and Au. 2) Any metal above hydrogen can displace it from dilute acids. Example: Any metal which is above another can displace that from its salt solutions Example: If two meta..

They are round biconvex cells that do not have a distinct nucleus. They are also called the thrombocytes. They number 250,000 to 400,000 per cubic mm of blood. Their life span is 8 to 14 days. They are involved in blood clottin..