1 Which term describes the type of reaction that takes place when e thene is converted to ethane by catalytic hydrogenation? @addition b) elimination ) substitution d) reairangement e) cyclization

Lewis structures please

Which of these molecules is not a natural amino acid?

Please don't provide handwritten solution ....

As we’ve discussed, a peptide bond is made when amino group of one amino acid combines with the carboxylic acid group of another amino acid (releasing a water molecule in the process). The C-N bond formed in this process is called a peptide bond. Peptide bonds have a few properties that might be unexpected. a) One property is that the molecular geometries around the C and N atom in the peptide bond are generally planar with bond angles of approximately 120 degrees. Provide an explanation for why the peptide bond would have this property, using Lewis structures, VSEPR theory and/or valence bond theory as appropriate.

Please help answer these questions on natural polymers

Now let us look at a real amino acid, alanine. Fill in the chart below for each ionizable group. You need only the relationship discussed in the pdf posted and the numbers posted below. The next 6 questions will ask for the numbers you calculated for each of the letters below. pH when Average charge of group Group Ka pKa [A]/[HA] = 1 when pH = pK alpha-COOH ~10-2 A C alpha-NH3* ~10-9 В

Find an example of an enzyme that was NOT discussed in the book or video lectures.  Answer the following questions about the enzyme that you chose. a)  What is the chemical reaction that is catalyzed by the enzyme? b)  Why is this enzyme/chemical reaction important to the organisms in which it occurs? Please post your source (include a link to the website you read your information)

Please answer the first question (number 7)

Part C and D