جميع المواضيع المتعلقة بـ ‘molecular’

 

kinetic molecular theory

kinetic molecular theory

1 – The particles are so small compared with the distances between them that the volume of the individual particles can be assumed to be negligible (zero).

2  – The particles are in constant motion. The collisions of the particles with the walls of the container are the cause of the pressure exerted by the gas.

3 – The particles are assumed to exert no…

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Chemical Nomenclature

Chemical nomenclature is the system of names that chemists use to identify compounds precisely. The systematic method of naming compounds is vital to the study of chemistry, because when a new substance is formulated, it must be named in order to distinguish it from all other substances.

Using this systematic method of naming compounds, the positive part is named and written first, followed by the negative part. The…

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Mole and chemical formulas

Because the individual atoms in a compound are combined in integer ratios, and each element has a specific atomic mass, it is possible to use mole calculations to determine chemical formulas. The two types of chemical formulas are molecular formulas and the empirical formulas.

– Often, the empirical formula is the same as the molecular formula.

The molecular formula shows the actual number of atoms in a substance….

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Molecular Mass of the Elements and compounds

Molar mass  means the mass of one mole. The molar mass concept can be applied to elements and to compounds. Molar mass is expressed in grams. For example, one mole of carbon has amass of 12 grams. Therefore, carbon’s molar mass is 12 grams. This is equivalent to the statement that 6. 02 x 1023 atoms of carbon have a mass of 12 grams. Consider this example: chemists know that…

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