Mole of Molecules

Mole of Molecules:The mass of a mole of molecules of a substance is the molecular mass expressed in grams.  Forexample, an oxygen molecule (O2) has a molecular mass equivalent to 32.0 grams because each oxygen atom has a molecular mass of 16.0 gra...

Read more »

The Mole

The Mole:A single atom or a few atoms are rarely encountered.  Instead, larger, macroscopic quantitiesare used to quantify or measure collections of atoms or molecules, such as a glass of water, agallon of alcohol, or two aspirin.  Chemists have introduced a large unit of matter, the mole, todeal with macroscopic samples of matter.  One mole represents a definite number of objects, substances, or particles. For example, a moleof atoms, a mole of ions, a mole of molecules. A mole is defined as the quantity of a pure substance that contains 6.022 x 10^23 units of that substance.  In other words, a mole is Avogadro's number of anythi...

Read more »

Molecules(Molecules of an Element and Molecules of a Compound)

MoleculesMolecules are groups or clusters of atoms held together by means of chemical bonding.  Thereare two types of molecule; molecules of an element and molecules of a compound. Molecules of an Element                                                                                                                  In certain cases, two single atoms of an element can be attracted to one another by a bond to form a molecule.  Examples of this are hydrogen, oxygen, and bromine. Molecules of a Compound  ...

Read more »

Atomic Mass Number

The sum of the total number of protons, Z, and the total number of neutrons, N, is calledthe atomic mass number. The symbol is A.  Not all atoms of the same element have thesame atomic mass number, because, although the Z is the same, the N and thus the A aredifferent.  Atoms of the same element with different atomic mass numbers are calledisotop...

Read more »

Atomic Number

The number of protons in the nucleus plays such an important role in identifying theatom that it is given a special name, the atomic number. The symbol Z is often used foratomic number. Hydrogen has an atomic number of 1 andlawrencium has an atomic number of 103.  The atomic number is also equal to thenumber of electr...

Read more »

Atom (The atom structure)

An atom is composed of a positively-charged nucleus orbited by one or more negatively-charged particles called electrons.The neutrons are electrically neutral, and the protons are electrically positive. Together the neutrons and protons give the nucleus its mass.The particles that orbit the nucleus are electrons. Each electron is negatively charged, and the charge of one electron is equal in magnitude (but opposite in sign) to the charge of one proton. Each electron is negatively charged, and the charge of one electron is equal in magnitude (but opposite in sign) to the charge of one proton.   An atom is an extremely small electrically-neutral...

Read more »

Characteristics of Matter

The term states of matter refers to the physical forms in which matter exists:  solid, liquid, andgas. Solids are characterized as having both a definite shape and a definite volume.  In a solid,the forces that keep the molecules or atoms together are strong. Therefore, a solid does notrequire outside support to maintain its shape.Liquids have definite volumes but indefinite shapes and are slightly compressible.  Liquids takethe shape of their containers.  The forces that keep a liquid's molecules or atoms together areweaker than in the solids.Gases are readily compressible and capable of infinite expansion. They have indefinite shape andindefinite volume.  Of the three states, gases have the weakest forces holding their molecules oratoms together.The different states...

Read more »

Branches of Computer

1-Computer Sciences 2-Computer Engineering 3-Information Technology 4-Information Sys...

Read more »

Branches Of Chemistry

Add caption Organic Chemistry Inorganic Chemistry Physical Chemistry Biochemistry Analytical Chemistry Nuclear Chemistry Organic Chemistry Inorganic Chemistry  ...

Read more »

Branches of physics

There are many branches and subbranches of Physics but some most popular branches and subbranches of physics are here. Mechanics Heat and thermodynamics Nuclear Physics Plasma Physics Solid State Physics AstroPhysics GeoPhysics BioPhysics Atomic and molecular physics Cosmology Theoretical physics Quantum Mechanics. ...

Read more »

History of Physics

Physics is a branch of science that developed out of philosophy, and was thus referred to as natural philosophy until the late 19th century - a term describing a field of study concerned with "the workings of nature". Currently, physics is traditionally defined as the study of matter, energy, and the relation between them. Physics is, in some senses, the oldest and most basic pure science; its discoveries find applications throughout the natural sciences, since matter and energy are the basic constituents of the natural world. The other sciences are generally more limited in their scope and may be considered branches that have split...

Read more »

History of Chemistry

The earliest record of man's interest in chemistry was approximately 3,000 B.C, in the fertile crescent. At that time, chemistry was more an art than a science. Tablets record the first known chemists as women who manufactured perfumes from various substances. Ancient Egyptians produced certain compounds such as those used in mummification. By 1000 B.C, chemical arts included the smelting of metals and the making of drugs, dyes, iron, and bronze. Iron making was also introduced and refinement of lead and mercury was performed. The physical properties of some metals such as copper, zinc, silver, and gold were understood. Many groups of people...

Read more »

History of Biology

The history of biology traces the study of the living world from ancient to modern times. Although the concept of biology as a single coherent field arose in the 19th century, the biological sciences emerged from traditions of medicine and natural history reaching back to ayurveda, ancient Egyptian medicine and the works of Aristotle and Galen in the ancient Greco-Roman world. This ancient work was further developed in the Middle Ages by Muslim physicians and scholars such as Avicenna. During the European Renaissance and early modern period, biological thought was revolutionized in Europe by a renewed interest in empiricism and the discovery of many novel organisms. Prominent in this movement were Vesalius and Harvey, who used experimentation and careful observation in physiology, and naturalists...

Read more »

Branches Of Biology

Botany In general there are two main branches of Biology Botany The scientific study of plants (about the structure, growing and particular region).   Zoology      2.  Zoology. The scientific study of animals including human. In the zoology exmining the internal and external structure of animals....

Read more »

Foundations of mathematics

Foundations of mathematics is the study of the basic mathematical concepts and how they form hierarchies of more complex structures and concepts, especially the fundamentally important structures that form the language of mathematics (formulas, theories and their models giving a meaning to formulas, definitions, proofs, algorithms...) also called mathematical concepts, with an eye to the philosophical aspects and the unity of mathematics. The search for foundations of mathematics is a central question of the philosophy of mathematics; the abstract nature of mathematical objects presents special philosophical challenges. But the foundations of mathematics as a whole does not aim to contain the foundations of every mathematical topic. Generally, the foundations of a field of study, refers...

Read more »

Branches of Mathematics

There are many branches of mathematics. Foundations Numbers Algebra Trignometry Geometry Mechanical Calculus...

Read more »

Disease

 Disease A disease is a affect which change the current condition of living or nonliving organisms internal or external or both. The normal condition of body disturb by some factors. The Main factors are Germs and Versus. There are two General types of Diseases.  Psychological Diseases. Biological Diseases. In this word every thing which exist affected by diseases. Like trees, Stones, mountains, Rivers and Oceans etc. We do not care of these things much because we do not feel his pain. We care those which used by us. (will be updating with the passage of time) ...

Read more »

History of Computer

 Computer Image From Past The history of computers starts out about 2000 years ago.A number of early cultures have developed mechanical computing devices.The abacus probably existed in Babylonia about 3000 B.C. The Chinese abacus is an excellent remaining unsurpassed in speed and accuracy of operation well into this century. The classical abacus was called "suan pan" by the Chinese- which meant “counting” or “reckoning” board. The ancient Greeks developed some very sophisticated analog machines. In 1901, an ancient Greek shipwreck was discovered off the island of Antikythera. The Romans used their hands to calculate. Because of their extremely cumbersome system of numbers, they evolved very elaborate “finger” arithmetic Arabic numbering system that came originally from India had...

Read more »

Origin of Mathematics

Origin of MathematicsThe word math comes from Greek Word "mathema" which mean learning and instruction. Mathematics has its origin like others technologies and subject.The origin of math is based on needs of mankind.When mankind face the problem in calculation then discover new methods for calculation. Some evidence From Past The  records of counting  come from physical evidence like scratches on sticks or stones or bones on the following images. ...

Read more »