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.

Monday, September 13, 2010

properties of ionic compounds

Let us learn about properties of ionic compounds

Ionic compounds are generally defined as being compounds where 2 or more ions are held next to each other by electrical attraction. 1 of the ions has a positive charge called a "cation" & the other has a negative charge "anion". Cation is usually metal atoms & anions are either nonmetals or polyatomic ions. Think back to grade 12 school: The same thing that makes the positive & negative ends of a magnet stick to each other is what makes cation & anions stick to each other.

All most all ionic compounds form crystals

Ionic compounds tend to have high melting points & boiling points

Ionic compounds are very brittle & very hard

Ionic compounds organize electricity when they dissolve in water


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



Sunday, September 12, 2010

born-haber cycle

Let us learn about born-haber cycle

The Born–Haber cycle is referred as an approach to analyzing reaction energies. Born-haber cycle was named after & developed by the 2 German scientists Max Born & Fritz Haber.

The Born–Haber cycle include the formation of an ionic compound from the reaction of a metal often a Group I or Group II element with a non-metal. Born–Haber cycles are applied primarily as a means of calculating lattice enthalpies that cannot otherwise be measured directly.

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

Wednesday, September 8, 2010

importance of chemistry

Let us learn about importance of chemistry

Chemistry has a reputation for being a complicated & boring science, but for the most part, that reputation is undeserved. Fireworks & explosions are based only on chemistry, so it's definitely not a boring science.

Chemistry is refers as science which deals with the properties of organic & inorganic substances & their interactions with other organic & inorganic substances.

We use chemicals every day life & perform chemical reactions without thinking much about them. Chemistry is very important because everything we do is chemistry! Even our body is made of chemicals. Chemical reactions occur when we breathe, eat, or just sit there reading. All matter is made of chemicals; therefore the importance of chemistry is that it's the study of each & everything.


In our next blog we shall learn about generating awareness on disaster management I hope the above explanation was useful.Keep reading and leave your comments.

Tuesday, September 7, 2010

properties of lithium

Let us learn about properties of lithium

Lithium is the 1st of the alkalis in the periodic table. In nature Lithium found like a mixture of the isotopes Li6 and Li7. Lithium is the lightest solid metal; Lithium is soft, silvery-white, with a low melting point & reactive. Many of Lithium’s physical & chemical properties are more similar to those of the alkaline earth metals than to those of Lithium’s own group.

Lithium is most commonly wheedling out from spodumene.

Lithium salts color flames bright red

Lithium is not used for structural applications


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


Monday, September 6, 2010

physical properties of hydrogen

Let us learn about physical properties of hydrogen

Hydrogen is originated in the atmosphere at trace levels. Hydrogen is synthesized from hydrocarbons & from water where it constitutes the lightest fraction of the H2O molecule. Hydrogen gas cannot sustain any life.

1) Hydrogen is Colorless 2) Hydrogen is Highly flammable 3) Hydrogen is Light in weight 4) Density: 0.0899*10 -3 g.cm -3 at 20 °C 5) Melting point: - 259.2 °C 6) boiling point: - 252.8 °C 7) Pure hydrogen is a gas under normal conditions. 8) Hydrogen is diatomic & much lighter than air. 9) Hydrogen has such small mass that it can escape earth's gravitational pull and fly off into space. 10) The gas mixes well with air, explosive mixtures are very easily formed. 11) The Hydrogen is gas is lighter than air.

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

Sunday, September 5, 2010

types of colloids

Let us learn about types of colloids

Colloids are mixtures whose particles are smaller than particles but larger than the size of a molecule which can be seen with the naked eye. Colloids are 1 of 3 major types of mixtures, the other 2 being solutions & suspensions. The 3 types of mixtures are distinguished by the size of the particles that make them up. The particles in a solution are about the size of molecules, approximately 1 nanometer 1 billionth of a meter in diameter. Those which make up suspensions are larger than 1,000 nanometers. Finally, colloidal particles range in size between 1 & 1,000 nanometers. Colloids are said to be as colloidal dispersions because the particles of which they are made are dispersed, or spread out, through the mixture.

Types of colloids

Some examples include mayonnaise, milk, butter, gelatin, jelly, whipped cream, muddy water, plaster, colored glass, & paper.

Every colloid consists of 2 parts: colloidal particles & the dispersing medium. The dispersing medium is the substance in that the colloidal particles are distributed. In muddy water, the best example, the colloidal particles are tiny grains of sand, clay & silt. The dispersing medium is the water in that these particles are suspended.

Colloids can be made from almost any combination of gas, solid & liquid. The particles of that the colloid is made are called the dispersed material. Any colloid consisting of a solid dispersed in a gas is said to be as smoke. A liquid dispersed in a gas is considered to as a fog.


Dispersing medium

Dispersed phase

Name

Solid

Solid

Solid sol

Solid

Liquid

Gel

Solid

Gas

Solid foam

Liquid

Solid

Sol

Liquid

Liquid

Emulsion

Liquid

Gas

Foam

Gas

Solid

Solid aerosol

Gas

Liquid

Aerosol

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

Thursday, September 2, 2010

valence shell

Let us learn about valence shell

The copper atom has only 1 electron. This represents that the copper atom has 1 electron that is near the outer portion of the atom. The outer shell of any atom is said to be as valence shell.

Valance shell electronic configuration which is the representation of the participation of electrons in orbits of atom.

The outermost shell of an atom is the valence shell that contains the electrons most likely to account for the nature of any reactions involving the atom & of the bonding interactions Valance shell has with other atoms. Electrons in the valence shell are termed as valence electrons

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

Wednesday, September 1, 2010

kingdom animalia

Let us learn about kingdom animalia

Each animal is the members of the Kingdom Animalia & also called Metazoa. This kingdom animalia does not contain the prokaryotes Kingdom Monera, includes bacteria, blue-green algae or the protists Kingdom Protista, and includes unicellular eukaryotic organisms. All members of the Animalia are multicellular, & all are heterotrophs which are, they rely directly or indirectly on other organisms for their nourishment. Most ingest food & digest it in an internal cavity.

With over 2 million different kinds of animals Kingdom Animalia is the biggest & largest of the kingdoms. But when we think of an "animal", what image comes to our mind? While animals like bears, fish, & birds are the most familiar to us, over half of all the animals on Earth belong to a group of animals known as "arthropods". Arthropods include animals such as centipedes, insects, crabs, & spiders. This means that the preponderance of animals come from a group of critters that give most folks the creeps!

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