Cada pregunta de este test está cronometrada.
In sep- funnel we mixed the layer by?
Shaking
Filtration
Swirling
A+C
Why we add (Nacl) in extraction experiment?
To remove impurities
To wash the organic layer
To remove water
B+C
The position of fractionating colume?
Behind receive adapter
Between distilling flask and condenser
Between condenser and receive adapter
A+B
The function of " glass beads" in fractional colume?
provide large surface area
more efficient separate
To prevent boiling
The role of boiling chips?
Remove impurities
ensure smooth boiling
prevent bumping
B+c
The techniques that "chromatography" depends on?
-absorption
-partition
-ion exchange
All of them
The rate of (sn1) reaction depends on?
Depend on the concentration of two of its reactants.
The concentration of one reactant
Depend on temperature
All of the above
T-butyl alcohol is more soluble in water than 1-butanol. Why?
Due to the big size of t-butyl
1-butanol more Electronegativity
T-butyl more branching
1-butanol have more hydrogen bonds
In alcohol reaction we add cold HCl. Why cold?
To decrease the reaction temperature
To prevent formatting methyl propene
To increase the solubility
In sep-funnel we add NaHCo3 to the organic solution. why?
Its a base
To react with unreacted Hcl
To form neutral solution
The function off adding Cacl to the organic solution?
To remove the acid
To remove the base
The rate of SN2 reaction rely on?
Temperature
Stability
Concentration of the two reactants
All of these are oxidation agents except
H2CrO4
Kmno4
Na2Cr2o7
NaHCo3
The way to obtain the aldehyde begor get over oxidation?
Uv
X ray
Color change
2°and 3° alcohol can go over oxidation by
Drastic condition
Highly acidic condition Temperature and concentration
Adding Hcl
When the temperature of cyclohexanol rise to 40°c We cool it why?
To prevent explode rhe solution
To prevent melting the compound
To prevent over oxidation
Aspirin is a common name for :
Acetyl acid
Acetoxybenzoic Acid
Acetylsalicylic acid
Salicylic Acid
The usage of Salicylic acid is: 1) anti-inflammatory 2)anti pyretic 3)powerfull analogie 4)Repair offissues
1,2
1,2,3
1,3
The material that binder Aspirin tablet
Starch
Buffer
Caffeine
