JSS Secondary One Chemistry
Semester II 2016
Worksheet 2: Chemistry Project Task (BLOG)
Part A : Water Quality
1) What is water quality?
Water quality refers to the condition of water including chemical, physical and biological characteristic, usually with respect to its suitability for a particular purpose such as drinking or swimming.
2) How can water quality be tested?
Water quality can be tested by using a water quality test kit. You can also test the quality of water by smelling, tasting, checking the cloudiness, checking the particles and examining the color.
3) Why is good water quality important in an ecosystem?
Good water quality is important as it supports the native fish populations, vegetation, wetlands and bird life. It is also important as many of our own uses depend on water quality that is suitable for irrigation, watering stock, fishing, spiritual needs and daily uses.
Part B : Jurong Eco Garden (JEG) - CleanTech Park
- Identify the main separation technique utilised in JEG
The main separation technique used is fractional distillation.
- Describe briefly the technique in general (Illustrate your description with labelled diagrams)
Fractional distillation differs from distillation only in that it separates a mixture into a number of different parts, called fractions. A tall column is fitted above the mixture, with several condensers coming off at different heights. The column is hot at the bottom and cool at the top. Substances with high boiling points condense at the bottom and substances with low boiling points condense at the top. Like distillation, fractional distillation works because the different substances in the mixture have different boiling points
- Describe how this technique is used in JEG
JEG uses this technique to keep their water clean and safe for the aquatic plants and animals to live in. They would heat the mixture in big containers and make it clean
- We can consider adding more animals and trees. We can add animals such as pond snails, Siamese Algae Eater and Common Plecostomus. These water animals help to clean ponds( eating the algae). Like this, it is more eco friendly rather than hiring workers to use technology to clean the pond. More trees can also be added around the lake to reduce the chance of soil erosion. Resulting to the pond water not being polluted.It also can help to keep the air clean and not polluted when construction work is going on.
- We can improve the water quality in the lake by reducing the use of fertiliser. Excess fertiliser can leach from the soil and impact the water(pollution). People tend to throw litter in the lake. In order to stop them from doing that we can fine them or help them to volunteer themselves to help clean the lake once a month if they do not stop.
- Simple distillation refers to the technique of purifying an organic liquid compound by precipitating and collecting the hot vapours coming off the boiling liquid. This method can also be used in identifying a substance by determining its boiling point. It is a method of achieving any mass transfer phenomenon that changes a mixture into two or more independent products or constituents.
- Another separation technique is Filtration. A filtrate is a liquid that has passed through the filtration process. In this process, liquid is strained. Bigger particles get stuck in the strainer, while smaller particles and liquid pass through, becoming filtrate.
- Water quality in the lake can be monitored by checking if the aquatic animals in the lake is living healthy and not dead. It also can be monitored by taking samples and filtrate it to see if the water is clean.
Part E:
- https://www.reference.com/
- https://en.wikipedia.org/wiki/Water_quality
- http://www.wiredchemist.com/chemistry/instructional/laboratory-tutorials/distillation
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