Definition
The branch of Natural science which deals with the study of composition, properties, structure, changes and the laws governing the changes that occurring inside the matter is called
Chemistry
The branch of chemistry which deals with the study of the chemistry of elements and their compounds, generally obtained from a non-living organism, i.e. from minerals is known as
INORGANIC CHEMISTRY
“Matter can neither be created nor be destroyed by chemical change.” OR“in any chemical reaction, the initial mass of reacting substance is equal to the final mass of products.”After latest research law can be stated as: “There is no detectable gain or loss of mass in an ordinary chemical reaction.”
LAWS OF CONSERVATION OF MASS
How many grams are there in 5.5 mol of sulphur?
176.0 g sulphur
__________ is that chemical reaction in which a substance is divided into two or more simpler substances.”Example:
CaCO3(s) → CaO(s) + CO2(g)
Decomposition reactions
The branch of chemistry which deals with the laws and the principles governing the combination of atoms and molecules in chemical reaction and study of physical properties of matter is called
PHYSICAL CHEMISTRY
The branch of chemistry which deals with the study of the methods and techniques involved to determine the kind, quality of various components in a given substance is known as
ANALYTICAL CHEMISTRY
PRACTICAL VERIFICATION of Law of mass by a german chemist on his experiment called
(Landolt Experiment)
Calculate the number of moles present in 108 g of aluminium Chloride AlCl3.( Al= 27,Cl=35.5)
0.8 moles
_____________ is that reaction in which two or more substances combine to form a single substance.”
Example:
CaO(s) + CO2(g) → CaCO3(s)
Addition reaction
The branch of chemistry which deals with the study of Hydrocarbon and its derivatives with the exception of CO2, CO, metal carbonates Bicarbonates and carbides are known as
ORGANIC CHEMISTRY
The branch of chemistry which deals with the study of compounds chemical reaction involves in living organism i.e. plants and animals and their metabolism in the living body is known as
BIOCHEMISTRY
Different samples of the same compound always contain the same elements combined together in the same proportion by mass”
LAW OF CONSTANT COMPOSITION OR LAW OF DEFINITE PROPORTIONS:
Balance the equation
N2 + H2 → NH3
N2 + 3 H2 → 2NH3
______________ is that reaction in which one atom or group of atoms of a compound is replaced by another atom or group of atoms.”
Example:
Zn + 2HCl→ZnCl2 + H2(g)
Displacement reaction
The branch of chemistry which deals with the study of different chemical processes involved in the chemical industries for the manufacturing of synthetic products like glass, cement, paper, soda, fertilizers, medicines, etc. is known as
INDUSTRIAL CHEMISTRY.
The branch of chemistry which deals with the study of changes occurring in the nuclei of atoms, accompanied by the emission of invisible radiations is known as
NUCLEAR CHEMISTRY.
If two-element combined to form more than one compound, the masses of one element that combines with a fixed mass of the other element are in the ratio of small whole numbers or some multiple of it”
LAW OF MULTIPLE PROPORTIONS:
2.77 moles
two compounds exchange their partners so that new compounds are formed.”Example:
NaCl + AgNO3 →NaNO3 + AgCl
Double displacement reaction
The branch of chemistry which deals with the study of the interaction of chemical materials and their effects on the environment of animals and plants is known as
ENVIRONMENTAL CHEMISTRY
The branch of chemistry which deals with the study of polymerization and the product obtained through the process of polymerization such as plastic, synthetic fibers, paper etc. is known as
POLYMERIC CHEMISTRY
when two different elements separately combine with the fixed mass of the third element the proportions in which they combine with one another shall be either in the simple ratio or some multiple of it
LAW OF RECIPROCAL PROPORTIONS
Find the mass of 0.75 moles of oxalic acid
94.5 g
“In ___________substances react with oxygen (free oxygen or oxygen of air) to produce eat energy and flame.”Example:
C + O2→CO2 + ∆H
combustion reaction