Select your two favorite amino acids. Draw them with correct stereochemistry and embed a picture of your drawings in your response. Then discuss: If these two molecules encountered each other in aqueous solution, what intermolecular interactions could be observed between the two molecules? How would changing the pH of the solution affect these interactions between the amino acids?

Consider The Following Reaction: CaCO3(S) + 2HCl(Aq) = CaCl2(Aq) + H2O(L) + CO2(G)  Write down the quation of the equilibrium constant kc for this reaction

Kk146.

The following equilibrium constants have been determined for hydrosulfuric acid at 25ºC: H2S(aq) ⇌ H+(aq)  +  HS–(aq)            K′c = 9.5 × 10–8 HS–(aq) ⇌ H+(aq)  +  S2–(aq)             K″c = 1.0 × 10–19 Calculate the equilibrium constant for the following reaction at the same temperature.  H2S(aq) ⇌ 2H+(aq)  +  S2–(aq)

5) Based on the concept of hard/soft acids and bases, will the products, or reactants be favoured in the following solution equilibrium? ZnO + 2 LiC4H9 Zn(C4H9)2 + Li₂O

Pleas give the structure of the major organic product in the reaction

Which of the two salts is hydrolyzed to a greater extent under equal conditions: KCN or KCIO? Why? Confirm the answer by calculating the hydrolysis constants. Write ionic-molecular and molecular hydrolysis equations. What pH of the medium will be observed during the hydrolysis of these salts: acidic or alkaline? Are solutions of these compounds dangerous to humans? Why? 8 四 00 i - BI

7:16 1. Carbohydrates a. If lactose were to react with an acid or an enzyme within the gastric system, what type of compound(s) would be formed in the stomach? explain. b. If fructose is ingested, but in this case you have just taken an alkaline medicine (milk of magnesium, for example), what would be the result of this mixture in our stomach? c. Explain in your own words what the Benedict test is (use at least one example). d. Arrange the next molecule in a chain CH₂OH OH OH OH ocet- all 95% O

Write the expression for the equilibrium constant Kc for the following equation. 2Na2CO3(s) + 2SO2(g) + O2(g) ↔ 2Fe(s) + 2Na2SO4(s) + 2CO2(g)

3. Answer all sections (i) - (iv). 1 mole of ethanol (C2H5OH) and 1 mole of ethanoic acid (CH;COOH) were reacted at 25 °C, in a non- aqueous solvent, until equilibrium was reached. It was subsequently determined that 0.33 moles of ethanol remained at equilibrium. (i) Write an equation for the reaction. (ii) Write an expression for the equilibrium constant, Kc, for the reaction and calculate its value. Subsequently a further 3 moles of C2H5OH was added to the solution. (ii) Determine the concentrations of all the species present when equilibrium is restored.