එළකිරි රසායන විද්‍යාව පන්තිය

[fishD]

එළකිරි රසායන විද්‍යාව පන්තිය

එළකිරි රසායන විද්‍යාව පන්තිය

EXAM ඉවර වෙලා දෑන් ගොඩාක් නිදහස්

ඉතින් පොඩි වෑඩක් පටන් ගන්න තමා හදන්නෙ !!

ඔක්කොටොම කලින් අද ආපු නන්ගිලා මල්ලීලා හෑමදෙනාටම ජයවේවා කිවුවා !!

හරි වෑඩි කතා ඔනී නෑ

කෙලින්ම වෑඩට බහිමු

ඔයාලා දන්නවා නේ A/L වලට රසායන ව්ද්යාව හරිම වෑදගත්

අපි මේ එකේ ඔයාලට තියෙන රසායන ව්ද්යා ගෑටලු ගෑන කතා කරමු

මම දන්න දන්න විදියට කියලා දෙන්නම් , බෑරි නම් කාගෙන් හරි අහල හරි කියලා දෙන්නම් (අපි එහෙමයි )

THREAD එක BUMPකරලා තියාගමු !!!

දෑන් ඉතින් BUMP එකක්වත් නොදා යනවා නෙමෙයි ඕන් ... ගහනවා ACID !!!​

 

[Pink panther]

 

[fishD]

Balancing Chemical Equations

 

[yama_palla]

gud wrk bro.....keep it up.

 

[fishD]

gud wrk bro.....keep it up.

thanks machan
aniwa

 

[Mr.Truth]

appata.
matanam eda idan pennanna bari wishayak.
ane manda matanam okkoma eka wage.

 

[Pathum921]

WOW maara patta subjct eka bun. Mamanam hena asai

 

[fishD]

appata.
matanam eda idan pennanna bari wishayak.
ane manda matanam okkoma eka wage.

 

[fishD]

WOW maara patta subjct eka bun. Mamanam hena asai

elakiri ah !!!
loweth

 

[sameerasadaru]

අපෝ මේකෙත් පටන් ගත්තද මේ මගුල
උබට වෙන විශයක් තිබ්බෙම නැද්ද වෙන මදැයි ටිකක් නිදහසේ ඉන්න එලකිරි ආවා

එල මචන් ගොඩක් අයට වැදගත් වෙයි දිගටම කර ගෙන යන්න

 

[fishD]

අපෝ මේකෙත් පටන් ගත්තද මේ මගුල
උබට වෙන විශයක් තිබ්බෙම නැද්ද වෙන මදැයි ටිකක් නිදහසේ ඉන්න එලකිරි ආවා

එල මචන් ගොඩක් අයට වැදගත් වෙයි දිගටම කර ගෙන යන්න

 

[fishD]

Using the Oxidation Number Technique

Tip-off – If you are asked to balance an equation and if you are not told whether the reaction is a redox reaction or not, you can use the following procedure. ​

General Steps

Step 1: Try to balance the atoms in the equation by inspection, that is, by the standard technique for balancing non-redox equations. (Many equations for redox reactions can be easily balanced by inspection.) If you successfully balance the atoms, go to Step 2. If you are unable to balance the atoms, go to Step 3.
Step 2: Check to be sure that the net charge is the same on both sides of the equation. If it is, you can assume that the equation is correctly balanced. If the charge is not balanced, go to Step 3.
Step 3: If you have trouble balancing the atoms and the charge by inspection, determine the oxidation numbers for the atoms in the formula, and use them to decide whether the reaction is a redox reaction. If it is not redox, return to Step 1 and try again. If it is redox, go to Step 4.
Step 4: Determine the net increase in oxidation number for the element that is oxidized and the net decrease in oxidation number for the element that is reduced.
Step 5: Determine a ratio of oxidized to reduced atoms that would yield a net increase in oxidation number equal to the net decrease in oxidation number (a ratio that makes the number of electrons lost equal to the number of electrons gained).
Step 6: Add coefficients to the formulas so as to obtain the correct ratio of the atoms whose oxidation numbers are changing. (These coefficients are usually placed in front of the formulas on the reactant side of the arrow.)
Step 7: Balance the rest of the equation by inspection.
​

 

[fishD]

PART 1

PART 2

PART 3

 

[fishD]

ANOTHER EXAMPLE

Fe2+(aq)

Fe3+(aq) (oxidation)
MnO4-(aq)

Mn2+(aq) (reduction)


mewata thamai half reactions kiyanne ,,, eeta passe e half reactions balance kara ganna one
menna mehema


Fe2+(aq)

Fe3+(aq) + e-
MnO4-(aq) + 8H+(aq) + 5e-

Mn2+(aq) + 4H2O



dan overall reaction eka liya ganna menna mehema




5Fe2+(aq)

5Fe3+(aq) + 5e-
MnO4-(aq) + 8H+(aq) + 5e-

Mn2+(aq) + 4H2O
------------------------------------------------------------
5Fe2+(aq) + MnO4-(aq) + 8H+(aq)

5Fe3+(aq) + Mn2+(aq) + 4H2O




mokak hari seen ekak tiyenawa nam PM ekak danna .........

 

[fishD]

Compressibility factor


The compressibility factor (Z) is a useful thermodynamic property for modifying the ideal gas law to account for behavior of real gases.[1][2][3][4][5] It is a measure of how much the thermodynamic properties of a real gas deviate from those expected of an ideal gas. It may be thought of as the ratio of the actual volume of a real gas to the volume predicted by the ideal gas at the same temperature and pressure as the actual volume.
For an ideal gas, Z always has a value of 1. For real gases, the value may deviate positively or negatively, depending on the effect of the intermolecular forces of the gas. The closer a real gas is to its critical point or to its saturation point, the larger are the deviations of the gas from ideal behavior.

The ideal gas law is defined as:

and the ideal gas law corrected for non-ideality is defined is:

where:

= pressure

= molar volume of the gas

= compressibility factor

= Universal gas constant

= temperature and thus:

 

[fishD]

What is a Mole?

A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 1023).



6.023 X 1023 kiyanne constant ekak. e thamai AVOGADRO's number kiyala kiyanne

 

[fishD]

PV=nRT

 

[shehan12345]

el 3L

 

[fishD]

Aldol Condensation

In some cases, the adducts obtained from the Aldol Addition can easily be converted (in situ) to α,β-unsaturated carbonyl compounds, either thermally or under acidic or basic catalysis. The formation of the conjugated system is the driving force for this spontaneous dehydration. Under a variety of protocols, the condensation product can be obtained directly without isolation of the aldol.


AND THE MECHANISM IS

 

[fishD]

MECHANISM OF THE ALDOL CONDENSATION
Step 1: