What is General Chemistry




What is General ChemistryThe ancient Phoenicians extracted dyes from a species of sea snail however at the same time just to obtain a single ounce of Tyrian purple dye 2 hundred thousands of snails were needed and became the choice of the royalty due to its hue and scarcity.

Chemists started looking for substitutes to these types of natural substances which were important but rare to acquire and thus started the search for precise or perfect form of tests.

Matter is regarded as the natural expression for any material things close to us and the fundamental definition for this would be whatever uses up space and can be perceived through our senses.

Principles of General Chemistry

Chemists understood the main principle and the real nature of chemicals, molecules, atoms and thus started the trip of fashioning molecules to order. This fascinating molding of chemical order starts with basics of chemical reactions, the types, the general characteristics of chemicals involved and also the fundamental stoichiometry involved in turning these simple elements into complex, crucial large molecules.

Chemists could also correlate these molecular structures using the characteristics of the materials mold and used components with special characteristics.

General Chemistry Formulas:

Chemical equations express which kind of and how much reactant must be employed to obtain certain quantity of product. From the law of conservation of mass, the mass of the reactants in a reaction should be equal to the mass of the products. Specifically chemical equations has to be balanced so that there are the identical number of atoms of each element within the products as you can find the same number of atoms of each element in the products as there are in the reactants.

General Chemistry Practice Problems

Below you could see problems

Solved Examples

Question 1: What is the percentage of lead in galena, PbS? Calculate to 0.one%

Solution:

The formula weight of PbS is acquired by adding the atomic weights of lead and sulfur, which we get fron the standard table.

Weight of 1 PbS = 239.3d

Weight of one sulfur atom (1S) = 32.1d

Weight of one lead atom (1 Pb) = 207.2 d

Hence 239.3d of PbS includes 207.2d of lead.  We see that 100.0g of PbS would contain

207.2d of lead

239.3d of galena X 100.0g of galena = 86.6g of lead

Hence the percentage of lead in galena is 86.6%.





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