1) The two possibilities are water purification tablets and ultra-violet light water purifier. Comparing these two possibilities, both are similar in terms of their cost. Both methods are cost effective where water purification tablets are only sold for an estimated cost of (50 tablets for $6.20) and ultraviolet light water purification only requires the user to replace the lamp and sleeve of the purifier annually. However, both of these methods differ in their effectiveness. For the water purification tablets, it […]
Month: February 2017
Earth is not cooling rapidly due to the greenhouse effect. When sun’s radiation is incident on the Earth’s surface, some of it is absorbed and some of it is radiated back to the atmosphere. However, some of the leaving radiation is trapped by greenhouse gases such as carbon dioxide, water vapour, and methane, retaining the heat in the Earth’s atmosphere. This phenomenon is called the greenhouse effect which hence explains why the earth isnt cooling rapidly despite more energy leaving the earth’s […]
1a. Exothermic. When charcoal burns, heat is released, hence its exothermic. 1b. Endothermic. When water molecules evaporate to form water vapour, water vapour contains more energy. Furthermore, the skin feels cool as temperature decreases when water evaporates, hence it is endothermic. 1c. Endothermic. Heat is absorbed when ice melts, forming water molecules in liquid state which contains higher energy. 2. For a good explosion, a large amount of energy should be released. Hence the reaction should be very exothermic. Therefore […]
The list below shows what we have learned today in the CM8001 Lecture: Different energy and wavelength of electromagnetic radiation Ozone layer Chlorofluorocarbons (CFCs) and how it damages the ozone layer in stratosphere Chemical bonds, subatomic particles and isotopes Structural formula of a chemical
Today’s group based learning was simply brilliant. My team nose-dived into the arcane world of chemistry with regards to the ozone. Learning about this quaint, yet vital for life, layer was intriguing and very fulfilling as an academic pursuit. We learned and debated about the proper name to be adopted for the ozone layer- whether ozone screen should be used instead- and weighed the pros and cons of each option. We then examined a cartoon depiction of the ozone problem exacerbated […]
Today’s lesson is about the use of ozone and how its is currently being depleted. In today’s discussion, we discussed about the why it is not feasible for us to create ozone and then ship it up into the stratosphere to curb with the problem of ozone depletion. There are several reasons why this is not feasible. The 1st reason is that this way doesn’t solve the root of the problem. The method is also not feasible because there is […]
I learnt that some of the solutions to reduce ozone depletion, such as the releasing of more ozone will not work. This is because, we are not solving the root cause of the problem. We should instead find ways to reduce the emission if ozone depleting chemicals.
Today we learnt about the ozone (O3) layer, its composition and function. As the ozone layer serves as a protective screen towards some of the UV radiation, today’s lesson also involved the different electromagnetic waves and their properties such as wavelength and frequency.