1
a type of alcohol that cannot be oxidized.
(a general name is ok)
tertiary alcohol
solubility of Group 2 Sulfates increase or decrease down the group?
decrease
what is the observation for the reaction of aldehyde + Felling's solution?
brick red ppt. formed
what is the type of catalyst used in Harbor Process?
(同相／异相)
heterogeneous
please give an example of polyester.
thank you.
ex. Terylene, PLA
Just be right
when a spontaneous reaction take place, the entropy change of the system---
A. Decrease
B. Remains
C. Increase.
D.Not sure, depending on moles of gasses on both sides.
C
give definition for Buffer Solution
it is a solution in which the pH does not change significantly when small amount of acid or base is added. (Minimize pH change)
when secondary alcohol is oxidized what will be formed?
ketone.
what is the basic unit for amino acid?
amino acid residue.
Please list two types of tertiary structure of amino acid.
:D
any two from
disulfide bridge
van der Waal's force
hydrogen bonds (weak)
ionic bonds
explain α-helix and β-pleated sheet.
(Both secondary structures, stabilized by NH bond on one peptide and CO bond on another peptide)
α-helix: hydrogen bonds within one chain
β-pleated sheet: hydrogen bonds between chains
what are the reaction condition and final product of oxidation of phenyls?
condition: basic condition with KMnO4
product: Benzoic acid (corresponding CH3 changes to COOH)
comparing bond energy of ion center with mono dentate, bidentate and EDTA considering Chelate effect?
a complex ion involving multi-dentate ligands is more stable than ions with fewer ligands surrounded.
why cis-plain of Pt(NH3)2Cl2 an anti-cancer drug but not the trans- one?
the cis one can prevent further division of cancer cells
what is the definition of Faraday?
please state its value.
thanks.
definition: the quantity of electric charges carried by 1 mole of electrons or 1 mole of singly charged ions.
96500 C · mol-1
how we get HNO2 ?
explain with a reaction formula (example)
NaNO2 + HCl → HNO2 + NaCl
Just be right
what are the names of function groups that can react with Br2(aq) to form white ppt. and decolorize Bromine water? (in organic chemistry)
list two of them.
phenol and phenyl amine
why diazonium dye a very stable dye?
it has both π (对不起这是pai) bond in benzene ring and double bond between N and N.
why ions of tradition metals can show different colors?
arrangement of electrons overlap with the structures of complexes, resulting some of the electrons to be activated to further positions. They will split into sets of non-degenerate orbitals at slightly different energy levels, which means photons with different frequency can be absorbed.
Just be right.
what is the formula used in calculating half-life in first order reactions?
0.693
concentration constant =—————————
t1/2
given a phenol, how can we get an amine with an extra carbon connected?
list all the reactants and condition required.
（r.t.）phenol+SOCl2 → halogen arene
(reflux+dry ether)halogen arene+ KCN + HCN(alc) +LiAlH4 → amine
comparing basicity of ammonia,phenylamine and R-NH2. explain.
basicity of ammonia> R-NH2 >phenylamine
big π(pai) bond make phenyl group the most electron withdrawing among these three. H is more electron donating comparing with R group. More electron-donating greater basicity.