Chemical bond From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electrostatic force of attraction between opposite charges‚ either between electrons and nuclei‚ or as the result of a dipole attraction. The strength of chemical bonds varies considerably; there are "strong bonds" such as covalent or ionic bonds and "weak bonds"
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Chemical Periodicity ------------------------------------------------- ABSTRACT The experiment chemical periodicity shows the properties and reactions belonging to group IA‚ IIA‚ and IVA. Proper procedures and observations were done to determine the solubility‚ physical state‚ color‚ and appearance of the compounds namely Li2CO3‚ Na2CO3‚ K2CO3‚ CaCO3‚ and BaCO3. The results shows that Li2CO3‚ Na2CO3‚ K2CO3 were soluble in water‚ while MgCO3‚ CaCO3‚and BaCO3 were not soluble. All of these compounds
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Chemical Bonding Chemical compounds are formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms ... a chemical bond. The two extreme cases of chemical bonds are: Covalent Bonds Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms‚ in contrast to the transfer of electrons in ionic bonds. Such bonds lead
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Chemical Nomenclature refers to the naming systems used with chemical formulas. This worksheet focuses on the most basic chemicals and nomenclature systems. Please read the information concerning each problem set and then attempt the problems associated with that information. The simplest compounds contain just two elements. Sodium chloride‚ NaCl‚ is an example of a binary compound. Several other examples are listed below. Potassium bromide KBr Calcium bromide CaBr2 Lithium fluoride LiF
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Foundations in Health and Safety NCC1 Element 11: Excavation Work and Confined Spaces - Hazards and Control FC1 Element 4: Fire Safety in Buildings IGC2 Element 3: Work Equipment Hazards and Control IOG1 Element 1: Health‚ Safety and Environmental Management in Context ICC1 Element 8: Chemical and Biological Health – Hazards and Risk Control Ma ter ial mp le Sa C NEBOSH Certificate Unit NGC1 RR Element 1: Foundations in Health and Safety Ma ter ial mp
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different concentrations of salt water effect plants. The test that will be performed will prove which concentration will have the worst effect. The hypothesis is that by measuring the plants growth each day‚ the largest concentration of salt will harm the plants the most. First‚ the plants were purchased and the water was prepared with the salt concentrations. Second‚ the plants were watered each day with the different concentrations of salt. Third‚ the plants’ growth were observed and recorded each
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of practice to ensure compliance with health and safety legislation. PAGE 2 P 1.2 Explaining the responsibilities for providing welfare facilities on-site. PAGE 4 P 1.3 Explaining the Construction (Design and Management) Regulations 2007. Evaluate the penalties for non-compliance with current health and safety at work legislation. Give at least two examples for easy understanding. PAGE 7 P 2.1 Analyse organizational health and safety policies and procedural documents. PAGE 10 P
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What is an occupational safety‚ health and environmental professional? To perform their professional functions‚ safety professionals must have education‚ training and experience in a common body of knowledge. Safety professionals need to have a fundamental knowledge of physics‚ chemistry‚ biology‚ physiology‚ statistics‚ mathematics‚ computer science‚ engineering mechanics‚ industrial processes‚ business‚ communication and psychology. Professional safety studies include industrial hygiene and toxicology
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The hypothesis If a chemical reaction occurs‚ then there will be indicators of a chemical change‚ was supported throughout this experiment. Throughout this experiment there were several reactions that took place‚ and an indicator of such chemical reactions could be seen throughout each one. The first piece of identifiable evidence was present in the first step‚ which was when copper (II) nitrate and sodium hydroxide were combined. When stirred‚ a blue precipitate formed at the bottom of the test
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changes are used to describe matter. A property is a trait of matter‚ when that sample of matter is in a fixed state. There are two different types of properties: physical properties and chemical properties. A change is something that alters the properties of a substance. There are two types of changes: chemical changes and physical changes. A physical property is a property that can be observed without changing the makeup (or composition) of a substance. Some examples of a physical properties
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