Answer:
B.
Explanation:
The change in color and the indistinguishable states of the substances must indicate a chemical change.
We need to know different types of van der Waal's forces.
There are three different van der Waal's forces.
van der Waal's force is driven by induced electrical interactions between two or more atoms or molecules. Though it is very weal in nature, this force is ultimately responsible for liquefaction and solidification of gases.
van der Waal's forces are non-directional. The strength of this force increases as the size of the units linked increases.
There are three types of van der Waal's interactions. They are- (i) Ion-dipole interaction, (ii) dipole-dipole interaction and (iii) hydrogen bond.
Ion dipole interaction is weakest among these three, dipole-dipole interactions are medium and hydrogen bonds are strong interactions.
We let the chemical equation for the weak acid indicator propyl red HPr be
HPr + H2O ↔ H3O+ + Pr-
Therefore, the acid dissociation constant Ka is
Ka = [H3O+][Pr-] / [HPr]
The color of this indicator turns from red to yellow or the other way around at its turning point at which
[HPr] = [Pr-]
Substituting this to the equation for Ka, we now have
Ka = [H3O+]
The pH of the solution at its turning point is
pH = -log[H3O+] = -log(Ka) = -log 3.3×10^-6 = 5.48
<span>On this account, the pH range is pH 5.0 to 6.0.</span>
The answer is TRUE
Protons do have positive charge while electrons have a negative charge
That would be
b.neutrons
Same number of protons different number of neutrons