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Q1— Section header —
1.1.1What are precious metals? (1\
1.1.2Name THREE examples of precious metals. (3\
1.1.3State TWO properties of precious metals that make them more appealing. (2\
1.1.4Name a base metal that is wide ly used as electrical conductor (1\
1.1.5Which base metal is used to make windows and door f rames? (1\
1.2State THREE uses of rubber. (3\
1.3Natural gas is a non renewable resource and a fossil fuel like coal and crude oil.
1.3.1Explain how natural gas is recovered from underground. (2\
1.3.2Name FOUR components (constitu ents\f natural gas. (4\
1.3.3Name THREE industries that use natural gas in their manufacturing processes. (3\ [20]20
Q2— Section header —
2.1Name FOUR ways in which different industries use water. (4\
2.2In South Africa, there are laws that a re set to protect the environment.
2.2.1Define the term sustainable development (2\
2.2.2What is the main purpose of NEMA? (1\
2.2.3NEMA is also responsible for setting guidelines of the rinciple of 'polluters must pay Briefly dis cus
2.2.4State THREE things for which a license is need ed with regard to the
2.2.5Name FIVE ways in which water can be use for domestic purpose.
2.4Draw a process fl ow diagram of a municipal waste water treatment plant. (10\ [30]30
2.3Explain how COD is determined in sewag e effluent. (1\ (6050422\ NC2450 (E\
Q3— Section header —
3.1The following diagram is a process flow diagram of the fractional distillation of air. Name the parts or functions in dicated on the diagram by writing the answer
3.2Give ONE property of each of the following industrial gases:
3.2.1Ammonia
3.2.2Argon
3.2.3zone
3.2.4Acetylene
3.2.5Chlorine (5 1\ (5\
3.3State FOUR applications of hydrogen. (4\
3.4Name TWO industrial gases that are used as refrigerants. (2\ [20] (6050422\ NC2450 (E\20
Q4— Section header —
4.1The most common type of glass i s soda lime silica or commercial glass.
4.1.1What is the percentage of silica in commercial glass? (1\
4.1.2Write the formula of calcium carbonate. (2\
4.1.3Name THREE properties of commercial glass. (3\
4.1.4State TWO uses of co mmercial glass. (2\
4.2The compounds in the following table are important for the production of glass. Write the chemical name of each formula next to the question number (4.2.1
4.2.4\ the ANSWER BOOK CHEMICAL FORMULA CHEMICAL N AME
4.2.1SiO
4.2.2CaO
4.2.3Na SO
4.2.4Na CO (8\
4.3State FOUR possible faults that may be seen when glass is produced. (4\ [20] (6050422\20
Q5— Section header —
5.1Name the following safety signs by writing only the answer nex t to the letter (A D\ in the ANSWER BOOK A B
5.2Whic h personal protective equipment are used for protection against the following:
5.2.1In haling dust particles and gases
5.2.2Protecting e yes against c oncentrated and toxic chemicals
5.2.3Full body protection
5.2.4Against noise (4 1\ (4\
5.3rief ly discuss flooding and explain how it can be prevented. (2\ [10] TOTAL: 10010