# Essays on Peculiarities of Combustion and Fire Coursework

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The paper “ Peculiarities of Combustion and Fire” is a suited example of a finance & accounting coursework. Matter, an international system of units (SI). Theoretical Question is the next. What are the fundamental units of measurements and derived units? Here are  FUNDAMENTAL UNITS PHYSICAL QTY. SYMBOL UNIT UNIT SYMBOL DIMENSION Length L Meter M L Mass M Kilogram Kg M Time T Second s T Electric current I Ampere A A Quantity of a Substance n mole mol n Temperature T Kelvin K θ Luminous Intensity Iℓ candela cd I Supplementary Units Angle θ radian rad   Solid Angle Ω steradian sr   DERIVED UNITS PHYSICAL QTY. SYMBOL UNIT UNIT SYMBOL DIMENSION Area A Square meter m2 L2 Volume V Cubic meter m3 L3 Speed v Meter per second m/s L/T Acceleration a Meter per second square m/s2 L/T2 Density p Kilogram per cubic meter kg/m3 M/L3 Explain numerical prefixes for SI units SI prefixes are used to avoid bulky numerical values. NUMERICAL PREFIXES for SI UNITS FRACTION PREFIX SYMBOL 10-1 Deci d 10-2 centi c 10-3 Milli m 10-6 micro µ 10-9 nano n 10-12 pico p 10-15 femto f 10-18 atto a MULTIPLE PREFIX SYMBOL 10 Deka da 102 hecto h 103 kilo k 106 mega M 109 Giga G 1012 tera T Chemical Elements and Compounds Theoretical Questions What are chemical bonds and valence?

Give example. When atoms do combine to form molecules, there is a shifting of valence electrons, that is, the electrons in the outer energy level of each atom. Normally, this results in the completion of the outer energy level of each atom. This more stable form may be achieved by the gain or loss of electrons or by the sharing of pairs of electrons. The resulting attraction of the atoms involved is called a chemical bond. When a chemical bond forms, energy is released. When this bond is broken, energy is absorbed (Mascetta 2003, p. 56). Example: Two atoms approach togetherThe electrons experience a force of attraction from both nuclei.

This negative-positive-negative attraction keeps the two particles together. This attraction is called a chemical bond one pair of electrons constitutes ONE bond.

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