1.1 INTRODUCTION Chemical bonding – the force of attraction between the two atoms Valence electron – the outer most shell electrons There are three types of chemical bonding i. Ionic bond: ________________________________________ ii. Covalent bond: _____________________________________ iii. Dative Covalent bond: _______________________________ 1.1.1 LEWIS DOT SYMBOL A shorthand to represent the valence electron of an atom. The element symbol
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Ammonia NH3 Gas at Physical state‚ liquid under pressure. Colourless Intensely irritating ammoniacal odour‚ with an odour threshold of 5-53 ppm Soluble in water alcohol and ether. pH of 11.7 Flammability limit of 15.5-25% Auto ignition temperature of 651C Elemental hydrogen and nitrogen gas are abundant and inexpensive. Using temperature 500C and pressure 150-200 atm‚ iron catalyst. Applications Mainly Fertilizer explosives such as TNT and ammonium nitrate Nylon Used for making
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DFD Yourdon Recently reviewed In the late 1970s data-flow diagrams (DFDs) were introduced and popularized for structured analysis and design (Gane and Sarson 1979). DFDs show the flow of data from external entities into the system‚ showed how the data moved from one process to another‚ as well as its logical storage. Figure 1 presents an example of a DFD using the Gane and Sarson notation. There are only four symbols: Squares representing external entities‚ which are sources or destinations
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------------------------------------------------- Methodological Basis of CDSS There are many different methodologies that can be used by a CDSS in order to provide support to the health care professional.[8] The basic components of a CDSS include a dynamic (medical) knowledge base and an inferencing mechanism (usually a set of rules derived from the experts and evidence-based medicine) and implemented through medical logic modules based on a language such as Arden syntax. It could be based on Expert
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New Er Digram for BIOIn software engineering‚ an entity–relationship model (ER model) is a data model for describing the data or information aspects of a business domain or its process requirements‚ in an abstract way that lends itself to ultimately being implemented in a database such as a relational database. The main components of ER models are entities (things) and the relationships that can exist among them. Entity-relationship modeling was developed by Peter Chen and published in a 1976 paper
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INTRODUCTION TO JAVASCRIPT {draw:rect} What is JavaScript? JavaScript was designed to add interactivity to HTML pages JavaScript is a scripting language A scripting language is a lightweight programming language A JavaScript consists of lines of executable computer code A JavaScript is usually embedded directly into HTML pages JavaScript is an interpreted language (means that scripts execute without preliminary compilation) Everyone can use JavaScript without
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Chemical Fertilizer vs Organic Fertilizer A chemical fertilizer is defined as any inorganic material of wholly or partially synthetic origin that is added to the soil to sustain plant growth. Organic fertilizers are substances that are derived from the remains or by products of organisms which contain the essential nutrients for plant growth. Comparison chart | Chemical Fertilizer | Organic Fertilizer | NPK Ratio: | 20 to 60% | About 14% | Example: | Ammonium sulfate‚ ammonium phosphate
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waves of shorter wavelengths. 3. a. Draw the energy-level diagram and write the electronic configuration for zirconium (element 40). (3 marks) Energy-level diagram for zirconium is drawn below: 4d 5s 4p 3d 4s 3p 3s 2p 2s 1s Electronic configuration for zirconium is given below: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d2 b. Use the diagram to explain why the Zr4+ ion exists. (2 marks) When the outer orbitals are filled with applicable number of electrons
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Frank and Alex in a tug-of-war • Draw the free body diagram on the back of your sheet or your notes for Frank winning (accelerating away) a tugof-war with Alex – Draw Frank and Alex as separate objects‚ with forces acting on each – How many forces are there on each? – Identify Newton’s 3rd law pairs – Identify Newton’s 2nd law relationships 1 Frank and Alex in a tug-of-war • Draw the free body diagram on the back of your sheet or your notes for Frank winning (accelerating away)
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Using Data Flow Diagrams Data flow diagram is used by system analyst to put together a graphical representation of data processes throughout the organization. It depicts the broadest possible overview of system inputs‚ processes‚ and outputs. A series of layered data flow diagrams may be used to represent and analyze detailed procedures in the larger system. By using combinations of only four symbols‚ the system analyst can create a pictorial depiction of processes that will eventually provide
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