Um to my best knowledge I believe  it is the carbonated water 
        
                    
             
        
        
        
Answer:
Al2(SO4)3 and Mg(OH)2
Explanation:
1. Al has a charge of 3-, and SO4 of 2-
when you cross multiply the charges you get 
Al2 and (SO4)3
*the reason theres a bracket around the sulfate ion is that the charge 3 is not for oxygen only, but the entire sulphate ion*
Hence, Al2(SO4)3
2. Mg has a charge of 2- and OH of 1-
again cross multiply
Mg (you dont need to add the 1) and (OH)2
again, the bracket around OH means the charge appiles to Oxygen AND hydrogen
hence, Mg(OH)2
 
        
                    
             
        
        
        
Answer:
 
  
Explanation:
Given that
d= 35 μm ,yield strength = 163 MPa
d= 17 μm ,yield strength = 192 MPa
As we know that relationship between diameter and yield strength 


d = diameter
K =Constant

So now by putting the values
d= 35 μm ,yield strength = 163 MPa
 ------------1
      ------------1
d= 17 μm ,yield strength = 192 MPa
 ------------2
           ------------2
From equation 1 and 2

K=394.53 
By putting the values of K in equation 1
 
 


Now when d= 12 μm


 
        
             
        
        
        
If a metal is less reactive than carbon, it can be extracted from its oxide by heating with carbon. The carbon displaces the metal from the compound, and removes the oxygen from the oxide. This leaves the metal.
        
             
        
        
        
Answer:
Copper is more reactive and higher in the activity series
Explanation:
Copper is able to replace the silver in a replacement reaction because it is more reactive and higher in the activity series. 
Substances or ions that are higher in the activity series are typically more reactive than those ones below them. 
In like manner, they are able to replace the lowers ones in a chemical reaction due to their higher reactivity potential. 
A less reactive element and a lower one in the activity series cannot displace a higher one in the series.