What is the primary cause of diffusion? some substances can dissolve in solvents heat added to a substance random internal motio
n of atoms and molecules attraction of opposite atomic charges
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
Answer:
random internal motion of atoms and molecule
Explanation:
The primary cause of diffusion is the random internal motion of atoms and molecules. 
Randomness of atoms and molecules results in diffusion. 
- Diffusion is the movement of particles from a region of high concentration to that of lower concentration. 
- Substances often tend to spread out over the concentration gradient. 
- Therefore, they have this propensity to be randomized. 
 
                                
             
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