Chemistry exam 01.06-2016 Flashcards
MCQ General Chemistry
1) Units for ppb
[ppb]=μg/L
[ppm]=mg/L
MCQ General Chemistry
2) Diameter of colloidal particals
1-500 nm
MCQ General Chemistry
3) In an isolated system
a. Entropy will always increase
MCQ General Chemistry
4) Cathode (+) of Cu/CuSO4 cell will be merged into a solution of what conc.
Cathode (+) 1 M Cu(NO3)2 (aq)
Anode (-) 1 M Zn(NO3)2 (aq)
MCQ General Chemistry
5) Sodium Bromide is dissolved in H2O, what happens to the solution
NaBr + H2O = Na+ +Br-
MCQ General Chemistry
6) Fog in colloidal system is
L/G (liquid particles dispersed in gas)
MCQ General Chemistry
7) Solution A has pOH 2, Solution B pOH 1, how is the H+ concentration
Solution A has 10 times higher amount H+-ions than Solution B
MCQ General Chemistry
8) In thin liquid chromotography (TLC), quality analysis is
Retention factor
Rf = Distance to plupp from baseline/Distance to topline from baseline
Brief General Chemistry
1) Define and give examples of reference electrodes
The e. p. of a reference electrode remains constant during the operation of the cell at a given temperature
(e.g. Ag/AgCl-, or the calomel, Hg/Hg2Cl2- electrode).
Brief General Chemistry
2) Boiling point of liquids
The temperature at which the vapour pressure of a liquid equals the external pressure.
The normal freezing point of a liquid is the temperature at which solid
and liquid are in equilibrium.
Brief General Chemistry
1) Define critical temperature and pressure
Critical temperature: the temperature above which it is impossible to liquefy the gas, no matter how high the applied pressure.
Critical pressure: it is the minimum pressure needed to liquefy a gas at its critical temperature.
Brief General Chemistry
2) 1st law of thermodynamics
{∆E} = Ein – Eout
Energy can neither be created nor destroyed, only interconverted between forms.
“The change of energy in a system is constant, any decrease must be exactly balanced by an increase”
Brief General Chemistry
3) Define Gibbs Energy and give equation, naming symbols
∆G ≝ ∆H - T x ∆S
G= Gibbs energy H= Enthalpy T=Temperature S=Entropy “Gibbs energy change combines enthalpy and entropy into a single state function.”
Brief General Chemistry
4) Anionic surfactant
Soap
Brief General Chemistry
5) Strong acid (high tendency to donate protons), weak base (weak tendency to accept protons)
Strong acids: HCl, H2SO4, HNO3
Strong bases: NaOH, Ba(OH)2
Weak acids: CH3COOH
Weak bases: Cl-
