Multiple choice Flashcards
Which of the following structures represents the conjugate acid of HPO 2- ?
A)H2PO4-.
B)H3PO4.
C) PO43-.
D) H2PO4.
E) PO42-.
H2PO4- (a)
The size of the colloid particles is between ……… and …………. nm.
1, 500
The solid-liquid (S/L) colloid dispersions are called
suspention
The liquid-liquid (L/L) colloid dispersions are called…
emulsion
Migration of the colloidal particles in an electrical field between two electrodes are called
electrophoresis
Write three different effects/things that can stabilize a colloid solution!
- charge
- ion absorption
- hydration
- colloids
The scattering of light by colloidal dispersion is called
tyndall effect
List four methods which can be used to coagulate a colloidal solution!!
- add salt
- heating
- electolysis
- add sodium chloride
What is the difference between a sol, a gel, and a xerogel? What does the “coherent” word mean?
sol: solution with particles
gel: coherent systmen
xerogel: no liquid (as solvent jsut solute)
coherent: molecules can meet together
All of the following have a standard heat of formation value of zero at 25oC and 1.0 atm except:
A) He(g)
B) H2O(s)
C) O2(g)
D) H2(g) E) N2(g)
B) H2O(s)
What are the “multidentate ligands” Write two examples for these ligands!
connect central atom ion with more bonds
What is the “catalyst” ? Show an example!
make activation energy lower
eg. h2o2 -> (MnO2) H2O + O2
Which compound is a solid in standard conditions?
I2, S,KMnO4, SO3, Na
Which compound is a gas in standard conditions?
H2, Ar, NH3, HCl,O3,NO2
Which compound is a liquid in standard conditions?
HNO3, H202, Hg, Br2
Which one of the following substances does only exist?
a. CH6
B. NaSO4
C.KI2
D. CO3
E.Al2O2
e
Which one of the following substances does only exist?
a. NaCl3
b. AL2O2
C.NH2
D.CACO3
E.K2CL
B
Which one of the following substances does only exist?
A. NACL2
B.LI2O
C.NH2
D.CA2CO3
E.MGCL
B
Which one of the following substances does only exist?
A. NACL2
B. AL202
C.N2H2
D.CACO3
E.KCL
KCL
Which one of the following substances does only exist?
A.BABR3
B.LICL
C.HE2O
D.NK4
E.KCL2
B
Which one of the following substances does only exist?
A.CH4
B.CA2SO4
C.SIO3
D.LIO4
E.NH4
A
Which compound has a strong odour (smell)?
A) KMnO4
B) Br2
C) NaF
D) H2
E) C (diamond
Br2
Which compound has a strong odour (smell)?
A) KMnO4
B) NH3
C) NaF
D) H2
E) C (diamond)
NH3
Which one of the next materials is soluble in water? A) potassium chloride.
B) barium sulfate
C) lead sulfate.
D) iodine.
E) silver chloride.
a
Which one of the next materials is NOT soluble in water?
A) sodium chloride.
B) ammonia.
C) potassium permanganate.
D) iodine.
E) hydrogen chloride.
d
Which of the following statements about the diamond is NOT correct ? It…
A)is nonpolar.
B) contains only carbon atoms.
C)is built up by covalent bonds.
D) is soluble in nonpolar solvents.
E)is combustible.
D
Which of the following statements about the sulfur’s molecule is NOT correct ? It…
A) is nonpolar.
B) contains 8 sulfur atom.
C) built up by covalent bonds.
D) ’s shape is a ring.
E) contains delocalized electrons.
E
Which
compound gives photochemical smog with brownish color?
A) NO
B) SO2
C) NO2
D)CO2
E) SO3
C
Which of the following statements about the oxigen is CORRECT ? It…
A) is polar.
B) is 78% of the air.
C) is an oxidizing agent.
D) has a characteristic odor.
E) is a liquid under 0oC.
C
goals of chromatogrphy
separation
identification
quantitative analysis
