Daily Chemistry Tricks

Radioactivity Property of a nucleus emitting alpha beta and gamma rays is known as radioactivity and the substance possessing the this property is called a radioactive substance the emission of these particles take place because of the instability of nucleus Alpha particle. nuclear size- the radius r of various nuclei can be approximately calculated in cm by using the relation .         r = r'A^1/3 where r' is a constant which is equal to 1.4 × 10^- 13 cm and A is  the mass number of a given nucleus. Types of radioactive decay The types of radioactive decay that occurs usually depends on whether the nucleus is above or below are to the right or to the stability belt. There are five common types of radioactive decay . Alpha emission- Beta emission- Position emission- Electron capture- Gamma emission-    

Acid-   Those subtances which gives H (positive)  ions after dissolving in water . (Acid ve subtance hote hai jo pani me gholne par H positive ions dete hai ) Example - CH3COOH (acetic acid ), HCOOH(farmic acid ),HCl (hydrochloric acid ) ,H2SO4 (sulphuric acid ) ,HNO3 ( nitric acid )  Note - jo acid jitna adhik H ions deta hai wah utna hi jyada acidic hota hai . For example - H2SO4 water me dissolve hone par 2 H ions deta hai aur HCl water me dissolve krne par kewal 1 H ions deta hai ,bcoz H2SO4 jyada yani ki 2 H ions deta hai isiliye ye HCl se jyada acidic hoga ."agar same concentration hoga to ." Note 1 - those acid which completely dissolve in water means 100% solubility ,those acid known as strong acid . Example - H2SO4 ,HCl Note 2 - Those acid which is not completely dissolve in water known as weak acid . Example - CH3COOH ,HCOOH. Base - those subtances which gave OH negative ions after dissolving in water . (Ve subtance jo water me dissolve krne par OH negative ions...