factors influencing corrosion (relative areas of the anode and cathode)

'. This layer is produced by electrolytic deposition. Dipping the iron/steel object in molten zinc and using it as the negative cathode zinc is coated on it. Zinc preferentially corrodes or oxidizes to form a zinc oxide layer that does not flake off like iron oxide rust. Also, if the surf..

>This 'rusting' can be prevented by connecting iron to a more reactive metal (e.g., zinc or magnesium). This is referred to as sacrificial protection or sacrificial corrosion, because the more reactive protecting metal is preferentially oxidised away, leaving the protected metal intact. I..

. Turgidity of guard cells is regulated by K + fluxes between them and the surrounding epidermal cells. Transpiration is also influenced by environmental factors such as light, temperature, availability of soil water and atmospheric humidity. Transpiration facilitates the moveme..

Climatic Factors - Rainfall and Water - Rainfall is a source for ground water and relative humidity. The amount of rainfall greatly affects the vegetation as well as animal population of a particular region. In tropical areas with heavy rainfall throughout the year, ve..

Sodium hydroxide is commonly called caustic soda because of its corrosive action on animal and vegetable tissues. Large quantity of sodium hydroxide is prepared by electrolytic process called the 'Chlor-alkali process'. Here, chlorine gas is given of at the anode and hydrogen g..

The charge to mass ratio is found by measuring the deflection of a ray under the simultaneous influence of electrical and magnetic fields, applied perpendicularly to each other as well as to the direction of the flow of light. This is illustrated in the figure below:..

If a current I flows through a potential drop V, the energy lost per second by the drifting charges is VI. In a resistor of resistance R, the loss of energy appears as heat. The rate of heat production P is P = VI = I 2 R = V 2 /R and is independent of the direction of current Electrolysis of ..

Hydrogen peroxide can be prepared on a large scale by the electrolysis of ammonium hydrogen sulphate dissolved in excess of sulphuric acid, using platinum electrodes and a high current density. In order to have high current density (i.e., current strength per unit area of the electrode) ..

The plane of the coil is horizontal and the split ring S 1 touches the brush B 1 while the split ring S 2 touches the brush B 2 . The brush B 1 is connected to the anode of the d.c. battery while the brush B 2 is connected to the cathode. The current flows in the coil in the dir..

It is the isolation in space of the two populations of the same species, due to geographical barriers such as the sea, deserts, mountains and rivers, for land plants and animals. Geographical isolation plays an important role in 'allopatric speciation'. Allopatric species are the related..