Answer:
a). The energy released by the alpha decay of 222 Rn is to 218 Po :
= 5.596 MeV
b).The energy of the alpha particle is 5.5 MeV
c) The recoil energy of Po = 0.096 MeV
Explanation:
The equation for the alpha decay of Rn to Polonium is:
 
 
The energy of the decay process can be calculated using:

 = Change in the mass
 = Change in the mass 
Mass of Po = 218.008965 u
Mass of He = 4.002603 u
Mass of Rn = 222.017576 u
 = mass of Po + mass of He - mass of Rn
 = mass of Po + mass of He - mass of Rn
=  4.002603 + 218.008965-222.017576  
= - 0.006008


= -5.596 MeV
<u><em>The negative sign means energy is released during the process.</em></u>
b) The energy of the alpha particle is :



= 5.494 MeV
= 5.5 MeV
c).
Recoil energy: When the parent nucleus is at rest before the decay then , there must be the some recoil of daughter nucleus to conserve the momentum.This is termed as recoil energy.
<u><em>The energy of the recoil polonium atom :</em></u>
The formula for recoil energy is :
<em>The total energy - the kinetic energy</em>
<em>= 5.596 - 5.5 </em>
<em>= 0.096 MeV</em>
 
        
             
        
        
        
it is a great change because the salt goes in and turn the water to salt water
 
        
                    
             
        
        
        
Explanation:
For a compound to show hydrogen bonding it is necessary that the hydrogen atom of the compound should be attached to more electronegative atom like fluorine, oxygen or nitrogen.
For example,  ,
,  and
 and  all these compounds contain an electronegative atom attached to hydrogen atom.
 all these compounds contain an electronegative atom attached to hydrogen atom.
Therefore, these pure compounds will exhibit hydrogen bonding.
Thus, we can conclude that out of the given options  ,
,  and
 and  are the pure compounds which will exhibit hydrogen bonding.
 are the pure compounds which will exhibit hydrogen bonding.
 
        
             
        
        
        
Answer:
the one with less thermal energy
Explanation:
thermal energy is heat