Answer:
Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic. Typical acid rain has a pH value of 4.0.
Explanation:
keep smiling (θ‿θ)
 
        
             
        
        
        
Answer:
Explanation:
specific heat of granite s = .79 J / g / k 
let the mass of granite = m 
heat lost by granite = heat gained by water 
heat lost = mass x specific heat x drop in temperature 
= m x .79 x (80 - 20.45)
heat gained by water 
= 3000 x 4.186 x (20.45- 20)
heat lost by granite = heat gained by water 
m x .79 x 59.55  =  3000 x 4.186 x .45
m = 120.12 g . 
 
        
             
        
        
        
The hydrogen one because who doesnt like snoballs'
        
             
        
        
        
Answer:   C2H4 + 3O2 → 2CO2 + 2H2O 
Explanation:
2Al + 2O2 → 2AlO + O2            Not Balanced Properly:  2Al + O2 = 2AlO  
C2H4 + 3O2 → 2CO2 + 2H2O  Looks Good
2CH4 + O2 → 2CO + 4H2          Not Correct:  CO should be CO2
Ca + O2 → CaOH                        Not Balanced and No source for the H
 
        
                    
             
        
        
        
All Elements are obtained in the periodic table & water is Not an element it is a compound.