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What is Chemistry?
The word chemistry comes from the word alchemy. It was an ancient set of practices, which encompassed elements of magic and science. An alchemist was one who practiced this art of alchemy. Later on an alchemist was called a chemist in popular speech from which the word chemistry was derived by adding a “ry” in the end.
Chemistry as a science was developed as a science only under the influence of scientists such as Sir Francis Bacon, Robert Boyle and John Mayow. Organic chemistry was developed by Justus Von Liebig and Friedrich Wohler.
Basic Principles of Chemistry:
Chemistry is basically a study of matter. A matter is defined as anything with rest mass and volume. A matter can be a pure chemical substance or a combination of substances. Any matter we can touch, taste or feel is made up of atoms.
An atom is a constitutive element of a matter. It is made up of a dense core called nucleus. It is made up positively charged protons and uncharged neutrons. It is surrounded by an electron cloud made up of negatively charged electrons.
A chemical element is made up of a single type of atom and a particular number of protons.
A pure chemical substance composed of more than one element is called a chemical compound.
A collection of substances is called a mixture like air and alloys.
Basic Processes of Chemistry:
Atoms sticking together in molecules and crystals are said to be in a chemical bond. New chemical substances are formed when chemical bonding takes place between two different atoms.
It is the attribute of a substance because of its atomic, molecular or total structure. During a chemical reaction, the chemical structure changes, as such it is accompanied an increase or decrease of energy.
When a chemical substance is transformed because of its interaction with another substance, a chemical reaction is said to have taken place.
A substance can be classified either as an acid or a base. An acid is a chemical substance which is characterized by its sour taste, its ability to transform blue litmus red and its ability to react with base. A base on the other hand is a substance that in an aqueous solution is slippery to touch, tu
s red litmus paper blue and reacts with acid to form salts. A chemical reaction between an acid and a base is called acid-base reaction.
Chemical equilibrium is that stage in a chemical reaction when both the reactants and the products are present in concentrated forms and have no further ability to change with time.
Basic Chemical Laws:
Chemistry assignment help can be made easy if you keep these chemical laws handy.
“Equal volumes of all gases, at the same temperature and pressure will have the same number of molecules”.
“The absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remains unchanged within a closed system”.
“When the pressure of simple dry gas is held constant, the Kelvin temperature and the volume will be directly related”.
“The solubility of a gas in a liquid is directly proportional to the partial pressure of the gas in equilibrium with that liquid”
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