I believe it is “Conduction” im not 100% sure tho, I haven’t done this since the 7th grade.
        
             
        
        
        
It's an ionic bond! Potassium is a cation, or a metal with a positive charge, and fluoride is an anion, or a nonmetal with a negative charge. 
A covalent bond is the bond between two nonmetals. 
Hope this helped!
 
        
                    
             
        
        
        
Answer:
0.125 moles
Explanation:
2.8 litres is equivalent to 2.8dm³
At STP,
1 mole = 22.4 dm³
x mole = 2.8 dm³
Cross multiply
22.4x = 2.8
Divide both sides by 22.4
x = 2.8/22.4
x = 0.125
 
        
             
        
        
        
PH + pOH = 14
pH 
= 14 - pOH
= 14 - 11
= 3
pH = 3
- lg [H+] = 3
[H+] 
= 0.001
= [HNO3]
= 1 x 10-3 M
        
             
        
        
        
Write an balance the equation 
Na2O + H2O -> 2 NaOH
Calculate the molecular mass of Na2O and NaOH from the atomic mass from the periodic table. 
Na = 23 
O=16
H=1
Na2O = 23 * 2 + 16 = 62
NaOH = 23+16+1= 40
For the stoichiometry of the reaction one mole of Na2O = 62g produce two mol of NaOH = 2* 40= 80 g 
120 g Na2O x 80g NaOH / 62g Na2O=
154.8 g NaOH