1
Textile Chemistry I- Organic
& Physical Chemistry
7.5 ECTS
Ladokcode: AT2TO1 The exam is given to: ExamCode:
Date of exam: 2018-01-19
Time: 14:00-18:00
Means of assistance: Calculators
Total amount of point on exam:: 50p Requirements for grading:
ECTS: Fx: 20-25 p, E: 26-30 p, D: 31-35 p, C: 36-40 p, B: 41-45 p, A: 46-50 p Additional information:
Attempt any 5 questions out of 6.
Next re-exam date: Will be notified later
The marking period is, for the most part, 15 working days, otherwise it’s the following date: Important! Do not forget to write the ExamCode on each paper you hand in.
Good Luck!
Examiner: Phone number:
Question#1
a) Determine the empirical formula of a compound that contains 26.7% P, 12.1% N, and 61.2% Cl, and has a molar mass of 580 g/mol. (4)
b) Phosphorus can be prepared from calcium phosphate by the following reaction: 2Ca3(PO4)2 + 6SiO2 + 10C → 6CaSiO3 + P4 + 10CO
Phosphorite is a mineral that contains Ca3(PO4)2 plus other non-phosphorus-containing
compounds. What is the maximum amount of P4 that can be produced from 2.0 kg of
phosphorite if the phoshorite sample is 75% Ca3(PO4)2 by mass? Assume an excess of
the other reactants. (6)
Question#2
a) A student mixes four reagents together, thinking that the solutions will neutralize each other. The solutions mixed together are 50 mL of 0.100 M HCl, 100 mL of 0.200 M of HNO3, 500 mL of 0.0100 M Ca(OH)2, and 200 mL of 0.100 M RbOH. Is the resulting
solution neutral? If not, calculate the concentration of excess H+ or OH- ions left in
solution. (5)
b) A chemist needs 1.00 L of an aqueous 0.200 M K2Cr2O7 (potassium dichromate) solution
in order to determine the contents of alcohol in a certain wine. How much solid K2Cr2O7
must be weighed out to make this solution? (5) Question#3
a) Write the names following organic compounds: (5)
b) Write the chemical formulas of following organic compounds: (5)
1. 3-ethyl-2-hexene-4-yne 2. 2-methyl-1,4-pentadien 3. (3E)-3-hexyl-6,6-dimethyl-1,3-heptadien
Question#4
a) What is the enthalpy change and enthalpy change per mole of H2O produced when 50
mL 0.3 M HCl is mixed with 50 mL 0.6 M NaOH at constant pressure and assuming that there is no volume change? (5)
Write the net ionic reaction. Assume that the specific heat and density of the solution is that of water. Both reactants are initially at 25°C and the final temperature of the solution is 31°C.
b) Calculate the standard free energy change for the following reaction and determine whether this reaction will proceed spontaneously at 30°C and at what temperature it is at equilibrium: (5) COCl2 (g) CO (g) + Cl2 (g) Substance ΔH°f (kJ mol-1) S° (J K-1 mol-1) COCl2 (g) -220 283.7 CO (g) -110.5 197.6 Cl2 0 223 ΔG° = ΔH° - TΔS° Question#5
a) Consider the following reaction. (5) aA → Products
[A]o = 5.0 M and k = 1.0 × 10-2 (assume the units are appropriate for each case).
Calculate [A] after 30 seconds have passed, assuming the reaction is: 1. Zero order
2. First order 3. Second order b) For a reaction: (5)
aA → Products
[A]o = 4.0 M, and the first two half-lives are 25 and 50 minutes, respectively.
1. Write the rate law for this reaction 2. Calculate k
3. Calculate [A] at t = 525 minutes Question#6
b) What is DLVO theory? What information do we get from it? (3) c) What is critical micellisation concentration? (2)
d) What is the importance of physical chemistry in textile sector? Give an appropriate example.(3)
