1. What concentration of magnesium chloride: (MgCl₂) in water is needed to produce an aqueous solution having an osmotic pressure of 17.2 atm at a temperature of 27°C?
(A) 0.176 M,
(B) 0.235 M,
(C) 0.353 M,
(D) 0.705 M,
(E) 1.41 M

27. In the formation of a root nodule, which step normally occurs first? (A) Bacteria produce 'nod factors'. (B) The infection thread is formed. (C) Plant roots secrete signals that attract Rhizobium. (D) Vascular connections to the nodule are established.

28. Which of the following elements is required for the stability of cell walls? (A) Zinc. (B) Chlorine. (C) Calcium. (D) Manganese. (E) Sodium.

29. Which of the following can be sensed by plants? (A) Gravity. (B) Pathogens. (C) Touch. (D) Light. (E) All of above.

30. When oxygen is released as a result of photosynthesis, it is a direct by-product of: (A) Splitting water molecules. (B) Chemiosmosis. (C) The electron transfer system of photosystem I. (D) The electron transfer system of photosystem II.

2. A general reaction is the formation of molecule C from two reactant molecules, A and B.   A + B → C The reaction was run multiple times at constant temperature using different initial concentrations of the two reactants. The initial rates obtained are included in the table below. The rate equation is of the form: Rate =  Determine the reaction orders with respect to A and B. (A) 1 & 1, (B) 2 & 1, (C) 0 & 1, (D) 0 & 2, (E) 1 & 2

3. Under what conditions does a real gas exhibit nearly ideal behavior?  (A) high temperature and high pressure, (B) high temperature and low pressure, (C) low temperature and high pressure, (D) low temperature and low pressure, (E) it is independent on temperature and pressure

4. What are the major species in an acidic solution (general formula: HA) that is 2.50% dissociated? (A) (B)(C) HA & H₂O, (D)(E)

5. Which of the following is not a state function? (A) pressure, (B) internal energy, (C) volume, (D) enthalpy, (E) work

6. Which of the following molecules has no dipole moment?  (A) SO3, (B) H2O, (C) HF, (D) O3, (E) CO

7. Which of the following titration combinations would have a pH less than 7 at the equivalent point?  (A) HNO3(aq) is titrated with NaOH(aq), (B) CH3COOH(aq) is titrated with NaOH(aq), (C) KOH(aq) is titrated with HCl(aq), (D) H2SO4(aq) is titrated with KOH(aq), (E) NH3(aq) is titrated with HCl(aq)