4. Draw all the structural and geometrical (cis-trans) isomers of C₃H₅CI.

(2) Calculate the AG if the expansion is carried against a constant pressure of 2 atm. Other conditions remain the same as in (1).

1. How can both n-type and p-type semiconductors be produced from pure silicon, respectively? Explain how n-type and p-type semiconductors increase electrical conductivity over that of pure silicon?

2. At elevated temperatures, NaClC3 decomposes to produce sodium chloride and oxygen gas. A 0.8765 g sample of impure NaClO3 was heated until the production of oxygen gas ceased. The O2 gas collected over water occupied 57.2 mL at a temperature of 22°C and a pressure of 734 torr. Calculate the mass percent of NaClC3 in the original sample. (Na = 22.99, Cl = 35.45, O = 16.00. At 22°C the vapor pressure of water is 19.8 torr)

3. When the supply of oxygen is limited, iron metal reacts with oxygen to produce a mixture of FeO and Fe2C3. In a certain experiment, 40.00 g iron metal was reacted with 22.40 g oxygen. After the experiment, the iron was totally consumed, and 6.48 g O2 gas remained. Calculate the mounts of FeO and Fe2O3 formed in this experiment. (Fe = 55.85)

(a) sodium peroxide

(b) ammonia

(c) sodium hydrogen carbonate

(d) sodium hypochlorite

(e) potassium bromate

    Being the global language, English has been deemed important in both the academic world and the work place. University students in Taiwan, accordingly, are required to reach a certain level of proficiency in English~commonly the intermediate level at leastbefore they are allowed to graduate. The requirements, however, have been received with both warm welcome and heated objections.      Take a stand on the issue of foreign language requirements and write an essay to either support or refute the necessity of such requirements. Your essay should include an introduction, your arguments, and a conclusion. Do not forget to give your essay a title. (100%)