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-
Brief General Chemistry
6) Raoults law
P = xA . PAo + xB . PBo
Brief General Chemistry
1) Define lyophilic, hypertonic solution, emulsion
Lyophilic=Hydrophilic
(Proteins, Nucleic acids, Emulsifiers, Micelles)
Hypertonic= A solution having a greater effective concentration than the cell fluid (shrink)
Emulsion= Amixtureof two or moreliquidsthat are normallyimmiscible
(O/W & W/O)
Brief General Chemistry
2) Define pressure
p=F/A
Brief General Chemistry
3) Define state function
A state function is a function that depends only on the current state of the system, i.e the initial and final state of the system.
Brief General Chemistry
4) 2 examples of ionic and metallic cystalline substances
Ionic: NaCl, CaF2
Metallic: HG, Au
MCQ Bioorganic & Food chemistry
1) Vitamin A structural characteristics
B-inone ring + All-trans arrangement
MCQ Bioorganic & Food chemistry
2) Starting unit in terpenes
(C5H8)n
MCQ Bioorganic & Food chemistry
3) Which has a chiral atom:
a. pyridine,
b. piperazine,
c. piperdine,
d. tropan,
e. coniine
e. coniine
MCQ Bioorganic & Food chemistry
4) Purine heterocycle
Adenine, Guanine
