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9. Elements with very large ionization energies also tend to have highly exothermic electron affinities. Explain
Given the ΔH° and ΔS°, calculate the G° values for the following reactions and indicate whether the reaction is spontaneous at standard conditions. If a reaction is not spontaneous, state what may be done to make the reaction spontaneous.
H° (kJ)
a. C (graphite) + 2 H2(g) ➡️ CH4(g) -74.9
b. CH3CH3(g) ➡️ H2(g) + C2H4(g) +137
c. N2(g) + 2 H2(g) ➡️ N2H2(L) +50
S°(kJ)
a. C (graphite) + 2 H2(g) ➡️ CH4(g)
+186.3
b. CH3CH3(g) ➡️ H2(g) + C2H4(g)
+121
c. N2(g) + 2 H2(g) ➡️ N2H2(L)
-331
1. Discuss the benefits of teaching through problem solving.
2. Explain what is meant by "tasks or problems that can be used for teaching
mathematics".
3. Select an activity from any chapter in Section 2 of the book of Van de Walle et al. How
can the activity be used as a problem or a task for the purpose of teaching through
problem solving?
4. Teaching through problem solving is not only about finding suitable problems and
presenting them to learners. What is the role of the mathematics teacher in a problem
solving lesson?
5. Analyse the value of group work while solving problems.
Implement the following problem in C programming language with following functions:
1- A function “Speed” that takes meters and seconds as parameters and returns the speed in meter
per second (m/s).
2- A function “Convert” that returns the kilometer per hour (kph) equivalent of m/s.
Call the above created function in main to test them.
Determine the pH of the buffer solution produced by the reaction of 5 mL 0.1 M KOH and 30 mL 0.1 M CH3COOH . The pKa of acetic acid is 4.76.
Find the pH of a solution produced by the reaction of 250 mL 0.1 M NaOH and 150 mL 0.03
M acetic CH3COOH Note that the pKa of acetic acid is 4.76.
4.Three women bought notebooks which was advertised to be P27.00 each. Each give P10.00 to the agent, and ask her to bring back P3.00. The agent returns to the desk. where she learns that the notebook is actually only P25.00 each. She gives P25.00 to the desk clerk, returns to the women, and gives back each P1.00, deciding not to tell them about the actual rate. Thus the agent has pocketed P2.00, while each guest has spent 10-1-P9, a total of 2+3-9-P29. What happened to the other peso?
An electromotive force of a cell is .8 5 V and is connected to a load of 4.25Omega , the voltage drops to 2.0 V. Find the current and internal resistance of the cell.
A copper wire is 2.50 m long and has a diameter of 2.5 mm. How much current will it draw when connected to 3.5 V source?
A man pulls a box with a force of 70N along the positive y axis, while a boy pulls it with a force of 50N, making an angle of 80° counter clockwise with the positive y axis. In what direction will the second boy apply a force of 60N so that the box will move in the positive y axis
