CM8001 Group 22

1  The weekly test is a good idea to improve our understanding of the course. However, i believe there can be improvement be made to the course.

Conduct quiz only after lecture have been conducted. After listening to the professor explaining the content in the lecture note, a quiz conducted after the lecture will enable the professor to understand what are the common mistake by student and the student will be better able to handle the quiz.

2 The group question can be some structured question from past year paper. This enables student to practice question from past year paper and at the same time student will be more familar with the exam format.

3For future batch of students, a online quiz can be conducted weekly instead of quiz in lecture. This provides more flexiency for student to do the quiz at their own preferrd time. This reduces the time spent on quiz during lecture and the lecturer will be able to spend more time explaining the quiz question.

Solubility is a chemical concept referring to the ability for a given substance, the solute, to dissolve in a solvent. It is measured in terms of the maximum amount of solute dissolved in a solvent at equilibrium.

• The fact that carbon dioxide is soluble in water enables us to have soda and sparking water. Without the concept of solubility, we will not be able to enjoy drink like soda and sparking and we will be limited to a fewer variety of drink in our everyday life.
• The fact that sugar is soluble in water enables us to sweeten our drink. Without the concept of solubility, we will not be able to sweeten our drink. Coffee or any other drink without sugar will be bitter and will be less frequently drink by human being.
• The fact that gases are soluble in blood enables the blood to transport oxygen to different part of the body. Without the concept of solubility, the body may not be able to transport oxygen. Without oxygen, human being will not be able to survive.
• For patients who are seriously sick with diseases or people who are brain dead, they may not be able to eat solid food. Food that are more soluble in water can be transported to their body easily through medical equipment to keep them alive.
• The concept of solubility is also important for drug or medicine. If the drug is not very soluble in water, the blood may have a hard time absorbing it. The more soluble the drug is in water, the more easily the blood can absorb.
• The concept of solubility also leads to many soda and soft drink being produced. The creation of such product leads to job created and lead to further boost of the economy.

Reference

Solubility. (n.d.). Retrieved March 4, 2015, from http://www.sciencedaily.com/articles/s/solubility.htm

How is solubility affect everyday life,? (n.d.). Retrieved March 4, 2015, from https://answers.yahoo.com/question/index?qid=20120108145716AAjB2l1

Introduction and explanation

Water is a polar molecule as the atoms bind in such a way that there are excess electrons on the oxygen side and lack of excess of positive charge on the hydrogen side. Non-polar molecules are molecules that have no charge as the charges cancel each other out. Polar and non-polar molecules cannot form a solution with each other as they have different polarity and they do not attract one another. In a solution with polar and non-polar molecules, the polar molecules will attract with the other polar molecules rather than the non-polar ones. The pulling of polar molecules will result in moving away from the non-polar molecules and therefore this will result in the solution unable to mix.

The attractive dipole-dipole forces between polar substances are stronger than the dipole-induced dipole attractions possible between polar and non-polar substances. Since water is a polar substance, polar and ionic substances are hydrophilic. Non-polar substances are left to interact primarily with themselves and with other non-polar substances. Since they cannot interact as strongly with water as strongly as water interacts with itself, non-polar substances are hydrophobic. When mixed, polar and non-polar materials tend to form separate phases with minimal surface area between them. Surfaces are often curved or spherical because a sphere encloses the largest volume with the smallest surface area. Surface tension is another manifestation of the forces that keep phases apart.

Reference

Why do polar compounds dissolve in water and non-polars compounds don’t? – Yahoo Answers. (n.d.). Retrieved March 4, 2015, from https://au.answers.yahoo.com/question/index?qid=20080827185129AAGzOqX

Polar and Non-Polar Molecules. (n.d.). Retrieved March 4, 2015, from http://www.school-for-champions.com/chemistry/polar_molecules.htm#.VPXbbyu4m-k

Topic

Desalination refers to the processes of removing salts and minerals from saline water. Desalination of water is carried out by two ways-1) Natural water desalination (The water cycle) and 2) Human Made Desalination Systems. During the hydrologic cycle the water that evaporates from the ocean leaves the salt content behind because salt does not evaporate. The water cycle helps in filtering saline sea water thereby creating fresh water for the irrigation of plants and crops. Human made desalination systems include thermal desalination and membrane desalination. Membrane desalination includes techniques like reverse osmosis and electro-dialysis.

Why is it important?

Importance of desalination- The earth is a planet with abundant water. The problem lies in the fact that most of the water (around 97 %) is in the oceans which have an average salt content of 35,000 ppm by weight and drinking this water regularly can be fatal. The rest of the water that is not in the oceans (around 3%) is not easily available for our use. Thus we need to use methods like desalination to produce fresh water for irrigation and human consumption. Desalination projects can be found in around 150 countries today. As world population increases, the demand for clean water will increase and desalination will become an important part of water supply in the 21st century.

Reference

Desalination. (n.d.). Retrieved March 4, 2015, from http://en.wikipedia.org/wiki/Desalination

Thoughts of a Lapsed Physicist. (n.d.). Retrieved March 4, 2015, from http://www.lapsedphysicist.org

Find Curriculum. (n.d.). Retrieved March 4, 2015, from https://www.teachengineering.org