PAHANG TRIAL 2009 EXAMINATION CHEMISTRY PAPER 2 MARKING SCHEMES SECTION A - Structural Questions: Question 1. (a) (i) The presence of isotopes 1M (ii) Let the abundance of 63X be a %. The % abundance of 65X. = ( 100 – a ) 1M Relative atomic mass = ( 62.93 x a) + ( 64.93 x ( 100 -a) ) 1M
Free Atom Electron Covalent bond
Marble Falls in Texas as the name suggests‚ rests on the banks of Lake Marble Falls. Lake Marble falls is one of the lakes that fall into the category of highland lakes.There are many activities to indulge in around the highland lakes area like fishing‚ observing wildlife and boating. It prides itself in the beautiful scenery it has to offer. It is an amazing town known for its infinite opportunities and remarkable growth. Famous for providing a serene environment‚ it is a pleasant and peaceful place
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CELL STRUCTURE CELL THEORY: Structural and functional unit of all living things New cells arise from already existing cells Cells contain information that instructs growth. This information can be passed onto new cells. MICROSCOPES: There are two main types of microscopes: Light and Electron Electron Micrographs- shown in colour LIGHT ELECTRON Uses beam of light Magnification = x1500 Resolution = 200 nm Wide range of specimens can be used Samples are fairly quick + easy to prepare
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Vol. 1 ACETIC ACID 115 ACETIC ACID 1. Introduction Acetic acid [64-19-7]‚ CH3COOH‚ is a corrosive organic acid having a sharp odor‚ burning taste‚ and pernicious blistering properties. It is found in ocean water‚ oilfield brines‚ rain‚ and at trace concentrations in many plant and animal liquids. It is central to all biological energy pathways. Fermentation of fruit and vegetable juices yields 2–12% acetic acid solutions‚ usually called vinegar (qv). Any sugar-containing sap or juice can
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The topic of my STEM fair project is cookie taste and appearance. “ How does cream butter‚ melted butter‚ margarine‚ and shortening affect the taste and appearance of chocolate chip cookies”. The purpose of this experiment is to see which type of butter substance is best for bakers to use to make the best chocolate chip cookie. The information from this project will help people who love to bake‚ to find the best way to make cookies that their eaters will enjoy the most. All bakers around the
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The Titration of a Basic Solution of Unknown Molarity with a Standard Hydrochloric Acid Solution Abstract The aim of the experiment was how to determine the molarity of a solution. My hypothesis was if I have to determine the molarity of a NaOH solution‚ then I would have to use a standard solution of HCl solution because I would need to neutralize each other to determine the concentration of the solution of NaOH. The method that I used for this experiment was titration. Titration helped
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__________ of an electron. A) mass B) shape C) momentum D) velocity E) color 5) 6) The de Broglie wavelength of a __________ will have the shortest wavelength when traveling at 30 cm/s. A) car B) planet C) hydrogen atom D) uranium atom E) marble 6) 1 7) The uncertainty principle states that __________. A) it is impossible to know the exact position and momentum of an electron B) there can only be one uncertain digit in a reported number C) it is impossible to know anything with
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of Ions in Solutions Using Acid/Base Chemistry: A Quality Control Test Objective: This lab focuses on the detection of ions using titration as an analysis tool. You will standardize NaOH and HCl solutions so that you know the exact concentration and then prepare samples of common household items in order to determine the amount of calcium in Tang®‚ Mg(OH)2 in Milk of Magnesia‚ etc. You will learn to prepare samples of a specified concentration‚ learn about acids and bases through the use of
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how Lupe Medrano felt in the story “The Marble Champ” by Gary Soto.Lupe is good at mostly anything except for sports.She has won several spelling bees‚has never missed a day of school (Except for when she got stung by a bee in Kindergarten)‚and she has her own shelf in her room built for all of her awards that she had won.Then on a rainy day‚she wanted to win something to do with sports.Lupe said “I wish I could be good at something‚anything‚ even marbles!”Lupe knew she would have to keep going and
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atoms can rotate and vibrate with respect to each other. These vibrations and rotations also have discrete energy levels‚ which can be considered as being packed on top of each electronic level. UV/Vis spectroscopy is routinely used in analytical chemistry for thequantitative determination of different analytes‚ such as transition metal ions‚ highly conjugated organic compounds‚ and biological macromolecules. Spectroscopic analysis is commonly carried out in solutions but solids and gases may also
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