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Elective Part (Select any 2 out of 3)
Students should learn Students should be able to c. Activation energy
energy profile
explanation of the effect of temperature change on reaction rate in terms of activation energy
Arrhenius equation:
log k = constant - Ea 2.3RT
draw an energy profile of a reaction
explain the relationship between temperature and reaction rate using Maxwell-Boltzmann
distribution curve
determine the activation energy of a chemical reaction
i. by gathering first-hand experimental data ii. with a given set of data
d. Catalysis and industrial processes
meaning and characteristics of catalyst
relation between activation energy and catalysis
describe the characteristics of catalysts using suitable examples
understand that catalysts work by providing an alternative reaction route
describe the effect of catalyst on reversible reactions
describe the applications of catalysis in industrial processes with examples such as iron in the Haber process and enzymes in the production of alcoholic drinks
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Students should learn Students should be able to e. Industrial processes
conversion of raw materials to consumer products as illustrated by the production of fertilisers
applications of principles of electrochemistry in industry as exemplified by the processes in the chloroalkali industry
advancement of industrial processes as exemplified by the conversion of methane to methanol
social, economic and
environmental considerations of industrial processes
describe feedstock, principles, reaction
conditions, procedures and products for processes involved in the production of ammonia
describe the process of the conversion of ammonia to fertilisers
explain the physicochemical principles involved in the production of ammonia
explain how industrial processes such as the Haber process often involve a compromise between rate, yield and economic considerations
describe the importance of fertilisers to our world
describe the importance of the chloroalkali industry
explain the underlying chemical principles involved in flowing mercury cell process and membrane cell process of the chloroalkali industry
describe the importance of methanol
recognise the significance of the conversion of methane to methanol
describe feedstock, reaction conditions,
procedures and products for processes involved in the manufacturing of methanol via syngas
discuss the advancement of the methanol production technology
discuss social, economic and environmental considerations of industrial processes as
illustrated by the Haber process, the chloroalkali industry or the manufacturing of methanol via syngas
f. Green chemistry
principles of green chemistry
green chemistry practices
describe the relation between sustainable development and green chemistry
calculate the atom economy of a chemical reaction
relate principles of green chemistry and practices adopted in the industrial processes as exemplified by the manufacture of acetic acid (ethanoic acid)
evaluate industrial processes using principles of green chemistry
Suggested Learning and Teaching Activities
Students are expected to develop the learning outcomes using a variety of learning experiences.
Some related examples are:
performing an experiment to determine the order of reaction for the decolourisation of phenolphthalein in a highly alkaline medium.
using initial rate method to determine the rate equation of the reaction between sodium thiosulphate and dilute hydrochloric acid.
performing experiments to determine the activation energy of a chemical reaction.
designing and performing experiments to investigate ways to change the rate of a reaction with a suitable catalyst.
performing calculations related to activation energy, percentage yield and atom economy.
reading articles on the importance of nitrogen fixation.
reading articles on the latest development of the methanol manufacturing process.
using computer modelling to study an industrial process and to control the production of a chemical plant.
analysing an industrial process from scientific, social, economic and environmental perspectives.
discussing the feasibility of using the principles of green chemistry for daily-life applications of chemistry.
searching for and presenting information about the greening of acetic acid manufacture.
reviewing industrial processes using green chemistry principles.
Values and Attitudes
Students are expected to develop, in particular, the following values and attitudes:
to appreciate the significance of knowledge and understanding of fundamental chemical principles for the production of synthetic materials.
to value the need for safe transport and storage of hazardous substances such as ammonia, acetic acid, hydrogen, chlorine and sodium hydroxide.
to show concern for the limited supply of natural products and appreciate the contribution of industrial chemistry to our society.
to recognise the importance of catalysts in chemical industry.
to show willingness to adopt green chemistry practices.
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STSE Connections
Students are encouraged to appreciate and comprehend issues which reflect the interconnections of science, technology, society and the environment. Related examples are:
Consumers have a great demand for products such as optical brighteners, but at the same time, the manufacturing process produces effluent, particularly volatile organic compounds (VOCs), and this is not environmentally friendly.
Chemists developed the process for the mass production of fertilisers to relieve problems related to inadequate supply of food.
Green chemistry involves the employment of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. In order to encourage business leaders to choose responsibly between traditional options and green solutions, more environmentally benign alternatives to current materials and technologies must be developed and promoted.
The fundamental challenge for the chemical industry is to maintain the benefits to the society without overburdening or causing damage to the environment, and this must be done at an acceptable cost.
Environmental damages were caused by careless disposal or leakage of chemicals in manufacturing processes (e.g. Bhopal Disaster and Minamata mercury poisoning incident) or widespread use of toxic chemicals (e.g. arsenic, cadmium, chromium, lead, phthalates, PAHs, PBDEs and tributyl tin).