Grinding solid crystals increase the rate of dissolving for a solid solute in water because smaller crystals have more surface area. The solubility of a substance depends on the physical and chemical properties of the solute and solvent as well as the temperature, pressure and the pH of the solution. For example increase in temperature increases the rate at which a solute dissolves in a solvent.
        
             
        
        
        
Answer:
2.15 mg of uranium-238 decays
Explanation:
For decay of radioactive nuclide-
                          
where N is amount of radioactive nuclide after t time,  is initial amount of radioactive nuclide and
 is initial amount of radioactive nuclide and  is half life of radioactive nuclide
 is half life of radioactive nuclide
Here  ,
,  and
 and 
So,
so, N = 2.446 mg
mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg
 
        
             
        
        
        
Answer:
The half-cells separate the oxidation half-reaction from the reduction half-reaction and make it possible for current to flow through an external wire.
Explanation:
 
        
                    
             
        
        
        
Explanation:
Since liquid isopropanol is a polar liquid and water is also a polar solvent. So, when both of them are added together then according to the like dissolves like principle they get dissolved. 
At the molecular level, the polar molecules of isopropanol get attracted towards the polar molecules of water at the surface of water.
As a result, water molecules get surrounded by isopropanol. Thus, water molecules enter the solution and evenly spread into the solution. 
 
        
                    
             
        
        
        
Answer:
group two elements are called alkaline earth metals
Explanation:
Because their oxides form in the earth and are water soluble