When NaCl is added to water, it dissolves into ions, Na+ and Cl-, since NaCl is a salt and a strong electrolyte. The resulting solution will have a neutral pH since NaCl is a neutral salt.
When HCl is added to water, it dissolved into ions as well, H+ and Cl-, since HCl is also a strong electrolyte. The resulting solution will have a pH of less than 7 since the H+ ions will increase the acidity of water.
Carbon is the only element that can form so many different compounds because each carbon atom can form four chemical bonds to other atoms, and because the carbon atom is just the right, small size to fit in comfortably as parts of very large molecules.
Answer: the graph of Charles' law is a graph that passes through the origin in which as one variable increases, the other also increases and vice versa.
Explanation:
Based on the diagram shown in the attached file
R = Radius of the sphere
a = Lattice constant
Using pythagoras theorem for the right angled triangle in figure 2
(4R)^2 = a^2 + a^2
16(R^2) = 2(a)^2
Solving the above equation
a=2R√2
To prove that the Atomic Packing factor is 0.74
Let the volume of atom in a unit cell be Vs
Total unit cell volume, Vc
Vc = a^3
Vc =(2R√2)^3
Vc=16R^3 √2 =22.63R^3
Since there are 4 atoms in the FCC unit cell
Vs=4*(4/3 πR^3)
Vs=5.33 πR^3
APF=(5.33 πR^3)/(22.63R^3 )
APF=0.74