Answer:
1) chemical indicators won't work above it's pH range so therefore it probably won't change colour. 
2) the solution should be clear and colourless to see colour change. 
3) indicators tend to be of low accuracy so it's not 100% reliable. 
 
        
             
        
        
        
Answer:
A. Chipping ice to flakes
Explanation:
You can't reverse the ice becoming flakes. They will stay like that until they melt
 
        
             
        
        
        
Molarity is given as,
                              Molarity  =  Moles / Volume of Solution  ----- (1)
Also, Moles is given as,
                              Moles  =  Mass / M.mass
Substituting value of moles in eq. 1,
                              Molarity  =  Mass / M.mass × Volume
Solving for Mass,
                              Mass  =  Molarity × M.mass × Volume  ---- (2)
Data Given;
                  Molarity  =  2.8 mol.L⁻¹
                  M.mass  =  101.5 g.mol⁻¹
                  Volume  =  1 L (I have assumed it because it is not given)
Putting values in eq. 2,
                              Mass  =  2.8 mol.L⁻¹ × 101.5 g.mol⁻¹ × 1 L
                              Mass  =  284.2 g of CuF₂
        
             
        
        
        
The pressure of the gas is increased<span> to 224 </span><span>kPa</span>
        
             
        
        
        
Answer:
A. 32.06 g/mol
Explanation:
The molar mass units are always g/mol