In this site we focused on the the areas of science incluod analytical chemisty, general chemistry, inorganic chemistry, organic chemistry, physical chemistry, and spectroscopy.(Online Chemistry Dictionary )

Yalla Science on Facebook

Follow @yallascience

Donate

Contact Form

Name

Email *

Message *

Followers

13.9.18

Theses and dissertations search engine


How can you find the theses and dissertations related to your study?


Dissertations and theses are an important and valuable tool for the library and the student and researcher in all areas of a subject.
Browse millions of science Free PDF articles Papers - Patents - Posters Institutional Repository · peer-reviewed journals · Free download · Open Access

Theses and dissertations search engine 






Free theses and dissertations- free scientific books pdf- free online research papers - free scientific articles pdf Download Free full PDF of Scientific Publications from a lot of scientific resources Physics sciences- Life sciences - Health sciences - Mathematics - Social sciences - Humanities

8.11.17

Best chemistry textbook pdf


Best chemistry textbook pdf 

You can download a lot of chemistry textbook from this post, it is easy to download free books of chemistry.
Now you are lucky to find this post because it has a lot of best pdf textbooks of chemistry for free and also you can see it online if you want.


Best chemistry textbook pdf

You can download the first package of  the best chemistry textbook pdf  or see it online from here












Source:
1-Freefullpdf for Scientific Publications

2.10.17

Weight percent w/w, w/v, v/v %- Percentage Concentration




Weight percent w/w, w/v, v/v %


weight per weight (W/W), weight per volume (W/V), volume per volume (V/V) meanings and how to use it in chemistry

w/w , w/v, v/v %


These variations on percentage concentration are used in chemistry and biology when making up solutions and have the following meanings.

% w/w
weight per weight: used where the weight of each chemical is used and not the volume (e.g. If I dissolve 10 g of fat in 90 g ethanol so the total mass of the whole solution is 100 g, then I have made a 10% w/w solution of fat)

% w/v
weight per volume: used where a solid chemical is dissolved in a liquid (e.g. if I dissolve 10 g of table salt, sodium chloride, to make up a total volume of 100 mL of a solution then I have made a 10% w/v solution of sodium chloride)

% v/v
volume per volume: used where both chemicals are liquids (e.g. if I dilute 50 mL of acetic acid by adding it to 50 mL of water there is now 50 mL of acetic acid in a total volume of 100 mL, hence the acetic acid concentration is now 50% v/v

% volume per volume (v/v), % weight per volume (w/v) and % weight per weight (w/w)

Source:

Freefullpdf for Scientific Publications

Some classes of organic compounds and their functional groups


Some classes of organic compounds and their functional groups

Fifteen of the classes of functional groups are shown, along with the general structural formula associated with that class. The key features are shown in red in the second column

Some classes of organic compounds and their functional groups


Tage: organic chemistry, structural formula, table

Source:
Freefullpdf for Scientific Publications

1.10.17

Propane models


Propane models

Propane, used as a fuel, is shown in 3 different representations commonly used for molecules. Each format is used to convey different information about the structure and components of propane.
Propane models
Propane models


Tage: propane, ball and stick, models, fuel, molecular formula

Source:
Freefullpdf for Scientific Publications

Ethane, minor component of natural gas



Ethane, minor component of natural gas

Ethane, a minor component of natural gas, is shown in representations. Each model conveys different information about the structure and components of ethane.


Ethane, minor component of natural gas
Ethane, minor component of natural gas

See also,
Methane Representations

Tage: ethane, natural gas, ball, and stick, model, molecular formula
Source:
Freefullpdf for Scientific Publications

30.9.17

Formula unit of NaCl, sodium chloride


Formula unit of NaCl, sodium chloride


The compound sodium chloride consists of Na+and Cl- ions held together by electrostatic forces of attraction in a very large ordered network called a crystal. The hypothetical combination of the one Na+ and one Cl- ion indicated is a formula unit. It is the smallest collection of ions from which we can deduce the formula NaCl.


Formula unit of NaCl, sodium chloride
Formula unit of NaCl, sodium chloride


Tage: sodium chloride, NaCl, empirical formula, electrostatic, salt
Source:
Freefullpdf for Scientific Publications

Symbols & periodic table locations of some monatomic ions


Symbols & periodic table locations of some monatomic ions


In general, (a) the metals of Groups 1A and 2A and aluminum have just one cation, which carries a positive charge equal in magnitude to the A-group number; 
(b) the metals of the B-group have two or more cations of different charges, though in some cases only one of these cations is commonly encountered; and 
(c) the nonmetals of Groups 7A and 6A, nitrogen and phosphorus form anions with a charge equal to “ the group number minus eight.” l

Symbols & periodic table locations of some monatomic ions
Symbols & periodic table locations of some monatomic ions


Symbols & periodic table locations of some monatomic ions

Scheme based on the periodic table to assist in writing formulas



Scheme based on the periodic table to assist in writing formulas

The lines trace a continuous path from boron (B) to fluorine (F). 

The element that is generally written first in the formula of a binary molecular compound is the one that is closer to the beginning of this path






Tage: periodic table, naming, binary compounds

Source:
Freefullpdf for Scientific Publications