Thursday, September 23, 2010

abiotic factors of the desert

Let us learn about abiotic factors of the desert

Deserts are always hot & dry. The abiotic factors of such an ecosystem include soil, sunlight, temperature, air and water. The scarcity of water, winds, high temperature, heat & land covered with sand makes the habitat fit to those kinds of animals which can survive such extreme climatic conditions. Hence, we mostly find animals like scorpions, camels, sand boa, lizards, insects, coyotes, & eagles. A few plants like cactus & other species of succulent plants which are adapted to hot & dry conditions are found in the deserts.

Abiotic factors are nonliving things which shape an organism's environment. These can include temperature, moisture, air currents, light, etc. In a desert biome: hot temperature, little precipitation, amounts of sun, lack of humidity, wind.

Some of the deserts in world are Sahara desert, Arabian desert, Gobi desert, Thar desert, Atacama, & Kalahari desert to name a few


In our next blog we shall learn about food labels explained I hope the above explanation was useful.Keep reading and leave your comments.


Wednesday, September 22, 2010

lewis acids and bases

Let us learn about lewis acids and bases

When a Lewis base reacts with Lewis acid, a covalent bond is produced.

Best example, CO2 Lewis acid reacts with OH- Lewis base to give HCO3- bicarbonate ion, BF3 boron trifluoride behaves as a Lewis acid & NH3 ammonia as a Lewis base.

Calcium oxide (CaO) behaves as a Lewis base, & sulphur trioxide (SO3) as a Lewis acid in the reaction between the 2.

CaO + SO3 ------------------> CaSO4

Lewis Lewis Calcium

Base acid sulphate

The Lewis concept of acids & bases suffers from the following limitations.
  • It fails to account for the relative strength of bases & acids, as it is not based on ionization.
  • An acid-base reaction essence an electron-transfer reaction should be pretty fast. Hence, many Lewis acid-base reactions are slow.

In our next blog we shall learn about transpiration excessive I hope the above explanation was useful.Keep reading and leave your comments.


Monday, September 20, 2010

chalcogens

Let us learn about chalcogens

The chalcogens are referred as the chemical elements in group sixteen of the periodic table. This group is also called as the oxygen family. Chalcogens consists of the elements oxygen (O), selenium (Se), sulfur (S), tellurium (Te), the radioactive element polonium (Po), & the synthetic element ununhexium (Uuh).

Oxygen, selenium, sulphur, tellurium & polonium constitute the group 16 of the periodic table of elements. The 1st 4 elements are collectively known as CHALCOGENS.


In our next blog we shall learn about chemical reaction calculator I hope the above explanation was useful.Keep reading and leave your comments.

Sunday, September 19, 2010

what is soil erosion

Let us learn about what is soil erosion?

Erosion is refers to a natural process, but Soil erosion has been increased dramatically by human land use, especially industrial agriculture, deforestation, & urban sprawl

Soil erosion occurs when the soil is blown away by the wind or washed away by the rain. Soil erosion is common in region with steep slopes, where trees & plants have been cut down, in droughts when crops & other vegetation grow poorly & in rural areas which are overpopulated.

Soil erosion can be stopped by building terraces on hillsides, irrigation schemes to overcome droughts, planting more & more trees to bind the soil together & make wind breaks, & using fertilizers in overpopulated areas to make the soil more fertile. It is important that the farming techniques applied do not damage the structure of the soil, as this makes it easily eroded. A good farming technique consists of contour ploughing, crop rotation and keeping the soil rich in humus.


In our next blog we shall learn about elements compounds and mixtures I hope the above explanation was useful.Keep reading and leave your comments.

Thursday, September 16, 2010

beam balance

Let us learn about beam balance

Beam balance is used in many stores to measure masses very precisely; the reading error is 0.05 gram.

The physical balance used in the science laboratory is pivoted in the middle with equal arms. The 2 scale pans of equal weights are dangled from the upper edge of wedge shaped supports at either end of the beam. When the beam is increased for weighing, it swings freely about the lower edge of a wedge shaped support in the center. The position the balance is in equilibrium.

Therefore l1 = l2 & m1 = m2, according to the principle of moments,

m1 x l1 = m2 x l2

Now let us place a mass of 1 kg in 1 pan & an unknown mass 'x' on the other pan so that the balance is in equilibrium.

then, (m1 + x) l1 = (m2 + 1) l2

As m1 = m2 and l1 = l2 Therefore x = 1 kg

In our next blog we shall learn about nonmetals I hope the above explanation was useful.Keep reading and leave your comments.


Wednesday, September 15, 2010

exothermic reaction

Let us learn about exothermic reaction

An exothermic reaction is referred as a chemical reaction which releases energy in the form of heat. Exothermic reaction is the opposite of an endothermic reaction. The chemical reaction in that heat is evolved is known as exothermic reaction.

Many chemical reactions release energy in the form of light, heat, or sound. These are called as exothermic reactions. Exothermic reactions may generate spontaneously & result in higher randomness or entropy (ΔS > 0) of the system. Exothermic reaction is denoted by a negative heat flow & decrease in enthalpy (ΔH <>

Bond breaking always needs energy while bond making always release energy. The balance between 2 processes result in 2 types of reactions exothermic & endothermic reaction. When the energy generated by bond forming is greater than the energy consumed by bond breaking there is a net generate of chemical energy. This type of reaction is known exothermic reaction.


In our next blog we shall learn about integral calculator step by step I hope the above explanation was useful.Keep reading and leave your comments.


list of organic compounds

Let us find list of organic compounds

An organic compound is 1 of the chemical compounds which the molecules contain carbon. Otherwise, organic compounds are referred as the compounds of carbon commonly containing carbon-carbon bonds.

list of organic compounds are follows

· Acyl/acid chlorides

· Cycloalkanes

· Cycloalkenes

· Annulenes

· Sulfides

· Sulfates

· Hydrochlorides

· Esters

· Ethers

· Sugars

· Cyanates

· Isocyanates

· Cyanides

· Cyanohydrins

· Fullerenes

· Phenols

· Phenyls and benzyls


In our next blog we shall learn about phosphorus cycle diagram I hope the above explanation was useful.Keep reading and leave your comments.