Chemistry Assignment Help

Chemistry Assignment Help

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Definition and scope of chemistry: Chemistry is a branch of physical sciences. Chemistry deals with composition, structure, properties and change of matter. Chemistry deals with constituents of a matter like, atoms and molecules; their interactions, transformations and the formation of new chemical substances.It can be divided into the following branches:

1. Inorganic chemistry

The study of inorganic substances and compounds.

2. Organic chemistry

The study of structure, property and reactions or organic compounds.

3. Bio-chemistry

The study of chemical reactions taking place within human beings and other living organisms.

4. Neurochemistry

The study of neuro-chemicals of the living body.

5. Nuclear chemistry

The study of sub-atomic particles.

6. Quantum chemistry

The study of physical basis of the chemical systems using quantum physics.

Basic principles of chemistry

1. Matter

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.

2. Atom

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.

3. Chemical Element

A chemical element is made up of a single type of atom and a particular number of protons.

4. Chemical Compound

A pure chemical substance composed of more than one element is called a chemical compound.8Molecule: Molecule is the smallest indivisible portion of a chemical substance that has a definite set of chemical properties and has the ability to undergo chemical change.

5. Mixture

A collection of substances is called a mixture like air and alloys.

Basic processes of chemistry

Some of the most important chemical processes are the following:

1. Chemical Bond

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.

2. Energy

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.

3. Chemical Reaction

When a chemical substance is transformed because of its interaction with another substance, a chemical reaction is said to have taken place.

4. Acid-Base Reaction

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.

5. Chemical equilibrium

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 which students will need

Chemistry assignment help can be made easy if you keep these chemical laws handy.

1. Avogadro’s laws

“Equal volumes of all gases, at the same temperature and pressure will have the same number of molecules”.

2. Boyle’s law

“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”.

3. Charles law

“When the pressure of simple dry gas is held constant, the Kelvin temperature and the volume will be directly related”.