TEST No.2 2009 Section A: [20 marks] 1. Which of the following solids has the highest electrical conductivity. (a) Ice. (b) Silver. (c) Sulphur. (d) Sodium Sulphate. 2. In which of the following pairs do “both” ions have the same number of electrons as an argon atom? (a) F1- Na+ (b) Cl1- F1- (c) S2- Cl- (d) Mg2+ Ca2+ 3. Which of the following groups contains only covalent molecular substances. (a) KOH; NH3; CO2
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Lung Cancer In general, cancer kills on average 7.9 million people worldwide every year, which is 13% of all deaths. Cancer is not just one disease but rather a group of diseases, all of which causes cells in the human body to change and grow out of control. Cancers are classified either according to the kind of fluid or tissue from which it originates. One of these types of cancer is Lung Cancer, more people die from lung cancer than any other cancer. With the advances of medicine and technology
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People are always discussing how to make better use of nuclear energy, so people should learn more about what nuclear fission and nuclear fusion are. Nuclear fusion is two or more atoms of small mass synthesize a relatively large atom. For example, deuterium and tritium occurs nuclear interaction with each other under certain conditions, such as high temperature and high pressure. They can generate neutrons and helium -4. Rather, nuclear fission is an atom of large mass that is divided into
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Purpose: The purpose of this experiment was to synthesize 4-chloro-4'-methoxychalcone from para-chlorobenzaldehyde and para-methoxyacetophenone by using an aldol condensation reaction. The compound was purified by recrystallization. The product was characterized by analyzing melting point, TLC, IR spectroscopy, 1H NMR spectroscopy, and mass spectroscopy. Mechanism: Key features of the aldol condensation reaction mechanism: (1) the formation of an enolate by an acid-base reaction; (2) nucleophilic
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After completing the experiment, it was concluded that the Grignard reaction did not happen, and the diphenylmethanol was not formed. This experiment was not successful mainly because no Grignard reagent or tiny amount of Grignard reagent was produced or active prior to addition of benzaldehyde. By the end of the lab, only berry-redish solution was produced without any solid, this is a physical evidence of not producing any diphenylmethanol, because diphenylmethanol is white crystal. Also, after
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Preguntas de autoevaluación Capítulo 5 5-1. La compañía Zimmerman excava diques. La función de producción está dada por Q=L12.K; donde Q es el número de diques excavados, L son las horas de labor y K es el número de herramientas utilizadas. a) Llene la siguiente tabla: b) La función muestra crecimiento, decrecimiento o es constante el retorno a escala? Al incrementar los inputs o insumos L y K en un mismo porcentaje, la cantidad producida de diques aumenta en un porcentaje mayor. Esto
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The development of the universe during the first million years of existence We know because of the theory that 14 billion years ago an explosion occurred; this event is now known as the Big Bang. This explosion happened as the universe had an incredibly high energy density, a really high temperature and pressure so all the energy was jammed into a very small space. The universe was tremendously hot because of particles of both matter and antimatter rushing apart in all directions its believed
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game, in setting high standards in all its endeavours and constantly challenging the status quo. With a portfolio of more than eighty operating companies in its stable, the Group’s diversity elevates it to a brand with unique character and promise. PROTON, Alam Flora, PUSPAKOM, Pos Malaysia, MODENAS, Bank Muamalat, Glenmarie Properties – these are some of the household names that form a part of the DRB-HICOM Group. From the Automotive and Services sectors to the Property, Asset and Construction sector
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Particles from the Universe 2.1 A Brief Introduction of Cosmic Ray The name of the cosmic ray came from the period when it was assumed as the electromagnetic radiation. Its components are mostly stable particles like protons, atomic nuclear or electrons. A fairly small proportion is stable antimatter. The diversity of the cosmic ray means the wide source of the cosmic ray. The source mat be the Sun or the distant universe through certain unknown mechanics. The cosmic
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areas that this will change in the next 20 years is that we will have a clean zero emissions way of producing gases that can be burn within automobiles. The Technology The proton exchange membrane electrolyzer also works in exactly the same way, by decomposing water with an electric current. The distinctive feature is a proton-permeable polymer membrane. An external voltage is applied to its electrodes, which are coated with noble metal. The coating acts as a catalyst and the water is therefore decomposed
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