Physical Chemistry Answers

Surface tension is as a result of ----

What makes hydrogen peroxide a polar molecule

The process of separating a pure solid from a solution is known as----

A sample of oxygen contains the isotopes 16O, 17O, 18O.
How many peaks would there be for the O2^+ ions in the mass spectrum of this sample of oxygen?

A .3M solution of HCl with a volume of 450 mL is poured into a chemically resistant balloon which contains excess zinc metal and which is otherwise empty. The balloon is immediately sealed. The HCl in solution completely reacts with the zinc metal forming zinc ions and H2 gas that expands the balloon. Assuming the balloon expands against constant pressure of 1.10 atm at the contant temperature of 20 celcius calculate the expansion work done on the gas. Assume the gas is ideal and that the volume of the liquid does not change.

Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025g of naphthalene burns in a bomb calorimeter, the temperature rises from 24.25∘C to 32.33∘C.
Find ΔrU for the combustion of naphthalene. The heat capacity of the calorimeter, determined in separate experiment, is 5.11kJ∘C−1.

What type of interaction exists between the particles of an ionic and covalent solids.Which solid has higher melting point?.Why?.Give example of each.

A reaction in which A, B and C react to form products is zero order in
A, one-half order in B, and second order in C.

By what factor does the reaction rate change if [A]
is doubled (and the other reactant concentrations are held constant)?
By what factor does the reaction rate change if [B]
is doubled (and the other reactant concentrations are held constant)?
By what factor does the reaction rate change if [C]
is doubled (and the other reactant concentrations are held constant)?
By what factor does the reaction rate change if the concentrations of all three reactants are doubled?

what is frenkel defect

Which has more excitation time? Uv or Floresence?