and science. Chemical reactions are the changing of substances to other substances by the breaking of bonds in reactants and the formation of new bonds in products. There are different types of chemical reactions such as combination reaction‚ decomposition reaction‚ single-replacement reaction‚ double-replacement reaction‚ and combustion reaction. Combination reaction is a chemical change in which two or more substances to form a new single substance. The reactants of most common combination
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Subject: Chemistry Topic: The Periodic Table The periodic table is a classification of all the elements based on ATOMIC NUMBER. It is composed of HORIZONTAL PERIODS and VERTICAL GROUPS which contain the elements arranged: *the order of INCREASING ATOMIC NUMBER *in the relation to the ELECTRON STRUCTURE of the atoms *in the relation to their CHEMICAL PROPERTIES (Criteria Used For Placing ELEMENTS in the Periodic Table) 1. ATOMIC NUMBER 2. NUMBER OF SHELLS (PERIOD) 3. NUMBER OF OUTER
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of hydrogen molecule (H2) Atomic Number of H = 1 Electronic configuration of H = 1. Valence electron of H = 1 Hydrogen forms duet‚ to obtain stable configuration. This configuration is similar to helium (a noble gas). Since‚ hydrogen has one electron in its valence shell‚ so it requires one more electron to form a duet. So‚ in the formation of hydrogen molecule; one electron from each of the hydrogen atoms is shared. Formation of hydrogen chloride (HCl): Valence electron of hydrogen = 1
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that atom in a compound. An element’s electronegativity value and other properties affect its oxidation state in different compounds. Decomposition: Some compounds decompose into more than one different element or compound as bonds are broken. Hydrogen peroxide (H2O2)‚ a chemical you may have around your house‚ is stored in a dark container to slow down decomposition‚ which can be caused by heat and light. clues that can indicate that a chemical change has occurred include: production of flames‚ color
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compounds forms between a. Potassium and iodine ion .b.Sodium and sulphide ions . c. Aluminums and chloride ions 2. Why does milk sour when kept for a long time/ 3. What happen when hydrogen combine with oxygen in presence of electric current/ 4. Define electrolysis. 5. What is decomposition reaction? Give an example 6. Calcium oxide react with water to form calcium oxide. What type of reaction is it? 7. What happen when ferrous sulphate is heated? 8. What happen when
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(1 mole) I want 20 g of C4H9Br so; ( 20 x 74 ) / 95.9 = 15.5 g ‚ so : Production of 1-Bromobutane will require 15.5 g of Butan-1-ol to obtain the full amount at 70% yield. Chemicals Needed: * Butan-1-ol‚ 7.72 g. (C4H9OH) * Sodium Bromide (powdered). (NaBr) * Concentrated
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Table of Contents Abstract ...2 Introduction ....................................................................................................................3 Theoretical Aspects 4 Affects of light intensities on plant photosynthesis measured by the amount of oxygen produced ..5 Experimental Aspects 6 Factors that Affect the rate of photosynthesis ...........7 Investigating
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sign for ΔH would you expect to see for a reaction that happens spontaneously‚ such as a piece of sodium reacting with chlorine gas? 2. Explain your answer. 3. Draw an enthalpy profile for this reaction But some reactions that happen spontaneously are endothermic Demonstration see powerpoint slides 1. ammonium chloride and barium hydroxide 2. citric acid and sodium hydrogencarbonate (Alka-Seltzer). So there must be something more going on to explain why endothermic
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Metals | Reaction with oxygen | Reaction with water | Reaction with steam | Reaction with dilute acid | Reduction of oxides by carbon / carbon monoxide | Reduction of oxides by hydrogen | K | Forms oxides and peroxides | Violent‚ metal darts on surface of water‚ hissing sound‚ sparks formed; Metal hydroxide and hydrogen gas formed. | Very Violent reaction | Very Violent | No reaction (Metals are very reactive and form very stable oxides; A lot of energy is required to overcome the strong electrostatic
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change that is due to the activities of human beings ( eg: burning fossil fuels‚ deforestation‚ etc.) While natural climate change is due to natural processes occurring on the Earth (such as dissolving of carbon dioxide in sea water and formation of carbonate rocks). ESSAY ON CARBON NEUTRALITY Carbon Neutrality‚ defined- “a transparent process of calculating emissions‚ reducing those emissions and offsetting residual emissions –net carbon emissions equal zero” ‚ is very much achievable‚ but there
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