glaciers. Another 20% are in certain areas that are too remote for human to access and the remaining 80% comes from the monsoon or floods. That leaves us with less than 1% of usable water from lakes‚ rivers and underground sources. Nevertheless‚ Science has helped mankind to solve this problem and one of the current approaches being explored in many countries‚ including South Africa is nanotechnology. Nanotechnology has developed widely in the past few years and was able to create new materials
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nonmetal atoms can share electrons. As you will see in the Covalent Bonds Gizmo™‚ atoms form bonds in this way. To begin‚ check that Fluorine is selected from the Select a substance menu. Click Play () to see the electrons orbiting the nucleus of each atom. 1. The outermost electrons in each atom are called valence electrons. How many valence electrons does each fluorine atom have? ________________________________________ 2. Click Pause (). Drag an electron from the left atom to the right
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Topic 5 – Bonding and Structure Revision Notes 1) Introduction • Atoms form bonds to get a full outer shell of electrons • There are three types of bonding: ionic‚ covalent and metallic • The structures produced by forming bonds are either giant or simple • The possible combinations of structure and bonding are giant ionic‚ simple covalent‚ giant covalent and giant metallic • Simple covalent is sometimes called simple molecular • Giant covalent is sometimes called giant
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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
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interrelated components that collect‚ manipulate and disseminate data and information and provide a feedback mechanism to meet an objective. 2.Data consists of raw facts‚ such as an employee number. 3.Knowledge workers are usually professionals in science‚ engineering‚ business and other areas. True 4.A system is a set of elements or components that interact to accomplish a goal 5.A measure of what is produced divided by what is consumed is known as efficiency. 6.A specific objective of a
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Majeed Thaika Year 10-11 ------------------------------------------------- Contents 1 Cells…………………………………………………………………….…..pg-05 -Animal and plant cells (pg-05) -Specialised cells (pg-06) -diffusion (pg-07) -osmosis (pg-08) 2 Plants…………………………………………………………..………….pg-09 -photosynthesis (pg-09) -Factors affecting photosynthesis (pg-10) -Plants and minerals (pg-11) 3 Food Chains and Cycles………………………...………………….pg-12 -Food chain (pg-12) -Energy transfer (pg-13) -Pyramids of biomass
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ammonia |13 | |(C) Alloys | | |Arrangement of atoms in metals |14 | |What are alloys? |15 | |Composition
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www.cppforschool.com COMPUTER SCIENCE WITH C++ FOR CBSE CLASS 12 Revision Notes Part -I [Structure‚ Class and Object‚ Constructor and Destructor‚ Inheritance‚ File Handling‚ Pointer‚ Array‚ Data Structure and class 11th revision tour] (Question 1‚2‚3‚4 of Board Exam Paper) CONTENTS Structure ................................................................................................................ 3 Typedef .......................................................................
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St Ivo School Geography Department - GCSE REVISION Solar Output – variations in amount of energy given off by sun – sunspots can affect solar output – e.g. reduction in sunspot activity between 1645-1715 likely cause of Little Ice Age Orbital Geometry – earth’s orbit of the sun varies in shape – when circular glacial periods have occurred‚ when elliptical warmer periods result (Milankovitch Cylces) www.geobytesgcse.wordpress.com Name and describe 2 external factors which affect climate change
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Atoms‚ Airs‚ and Chemical Bonding Rich McConnell‚ CH-201 Grantham University Atoms‚ Airs‚ and Chemical Bonding 1. Alcohol in our digestive system reacts with oxygen gas to form carbon dioxide and water. How many grams of carbon dioxide are released if a 10.00 g alcohol sample reacts with 20.85 g of oxygen gas and produces 11.77 g of water? Answer: 19.08g CO2 2. Using the periodic table‚ fill in the missing information in the following table: Protons Neutrons Electrons Isotope Symbol 27 32 27
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