Zadanie 5a
Proteins are polymers of amino acids. State the type of bonding that joins the amino acids together along a polypeptide chain.
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Proteins are polymers of amino acids. State the type of bonding that joins the amino acids together along a polypeptide chain.
A biochemist wants to find out which of the amino acids glycine, serine and leucine are present in a short peptide. Outline how paper chromatography can be used to do this.
Which electron configuration is the ground-state configuration of an atom of a d-block element? A. 1s22s22p63s23p64s23d4 B. 1s22s22p63s23p64s13d5 C. 1s22s22p63s23p64s23d104p1 D.…
Palmitic acid, CH3(CH2)14COOH, and palmitoleic acid, CH3(CH2)5CH=CH(CH2)7COOH, which has a cis C=C double bond, both have a chain of sixteen carbon atoms. Predict which of the two fatty acids has the higher melting point and give two reasons for…
Which electron configuration represents an atom of a d-block element in its ground state? A. 1s2 2s2 2p6 3s2 3p6 4s1 3d6 B. 1s2 2s2 2p6 3s2 3p6 4s2 C. 1s2 2s2 2p6 3s2 3p6 4s2 3d6 D.…
Which property generally decreases as the first ionization energy of elements increases? A. Atomic radius B. Electronegativity C. Non-metallic character D. Acidity of the oxide
On going down group 1 from lithium to caesium, the first ionization energy of the elements decreases. Which property also decreases down the group? A. Electronegativity B. Atomic radius C. Reactivity with water D. Number of occupied energy levels
The periodic table in the data booklet shows 118 elements. A new element with atomic number 120 is made. It would be expected to have chemical properties most similar to which element? A. Francium B. Radium C. Actinium D. Radon
The periodic table currently ends at element 118. A new element with atomic number 120 is synthesized. In which group of the periodic table would it be placed? A. Group 1 B. Group 2 C. Group 3 D. Group 18
The formula of yttrium sulfate is Y2(SO4)3. What is the formula of yttrium nitrate? A. YNO3 B. Y(NO3)2 C. Y2(NO3)3 D. Y(NO3)3