ductile - NON-METALS – is element that is usually a gas or a dull powdery solid Halogen family - Very reactive - Can be poisonous - Chlorine gas was used as a chemical weapon during WW1 - Iodine is used to disinfect scrapes and cuts - Bromine can be added to increase the brightest and life of the bulb‚ but dangerous when it is near flammable materials Alkaline family - Shiny‚ silvery‚ and soft - Calcium helps builds strong bone and teeth - Strontium builds strong shell in cooral
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electrolysis to work‚ the ions must be free to move. Ions are free to move when an ionic substance is dissolved in water or when melted. For example‚ if electricity is passed through molten lead bromide‚ the lead bromide is broken down to form lead and bromine. Electrolysis Here is what happens during electrolysis: - Positively charged ions move to the negative electrode during electrolysis. They receive electrons and are reduced. - Negatively charged ions move to the positive electrode during
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Vegetative reproduction (vegetative propagation‚ vegetative multiplication‚ vegetative cloning) is a form of asexual reproduction in plants. It is a process by which new individuals arise without production of seeds or spores. It can occur naturally or be induced by horticulturists. Although most plants normally reproduce sexually‚ many have the ability for vegetative propagation‚ or can be vegetatively propagated if small pieces are subjected to chemical (hormonal) treatments. This is because meristematic
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FORENSIC CHEMISTRY FORENSIC CHEMISTRY SUMMARY NOTES |Ensuring accuracy and contamination of samples for analysis – 1a and 1A |Ensuring accuracy and contamination of samples for analysis – 1a and | | |1A (continued) | |Caution must be taken by scene investigators with regard to their tools‚ |
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the stratosphere due to its faster destruction by chemicals released by man into the environment. Depletion is mainly caused by chlorofluoro carbons (CFCs)‚ halons‚ methyl chloroform and carbon tetrachloride. There substances contain chlorine or‚ bromine which‚ can reach the stratosphere. These elements are capable of catalytically breaking down ozone into oxygen. Ozone depletion can also be caused by supersonic jet exhausts. They liberate NO which reacts with 03 to form N02 and 02 The area on the
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CHEMISTRY 221 LABORATORY�QUANTITATIVE ANALYSIS EXPERIMENT: DETERMINATION OF ASCORBIC ACID IN VITAMIN C TABLETS THEORY: Ascorbic acid‚ C6H8O6‚ MM = 176.13‚ can be oxidized to form dehydroascorbic acid by bromine via the following reaction: The bromine or iodine used in the titration is generated by adding an excess amount of KBr or KI to an acidified solution of the sample according to the following reaction: BrO3- + 5 Br- + 6 H+ 3 Br2 + 3 H2O IO3- + 5 I- + 6 H+
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Experiment 13: Synthesis of 1- Bromobutane An SN2 Reaction Theory: One of the methods of preparing alkyl halides is via the nucleophilic substitution reactions of alcohols. Alcohols are inexpensive materials and easy to maintain. However‚ they are a poor leaving group the OH group is a problem in nucleophilic substitution‚ this problem is fixed by converting the alcohol into H2O. Objective: The objective of this lab is to observe the synthesis of 1-bromobutane in an SN2 reaction‚ to see how
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meta-directing. Reactions: Electrophilic aromatic substitution rxns‚ Nucleophilic aromatic substitution rxns (via benzyne or substitution-elmination)‚ Diels-Alder (endo/exo‚ inter/intramolecular)‚ Diene 1-2 and 1-4 electrophilic addition‚ Eliminating bromine from arenes via Grignard‚ Carboxylation of arenes via Grignard 4 Properties of: Amines (pkAs and resonance structures for aromatic and aliphatic molecules)‚ amides (sp2 hybridized by amide bonds)‚ anilines (aromatic amines) Structure of: Sugars
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Pluto’s moon? -CHARON 19. The 3 main parts of a comet are the nucleus‚ the tail‚ & the? -COMA 20. What human organ cleans fifty gallons of blood everyday? -KIDNEY 21. What’s the only metal that’s not a solid at room temperature? -BROMINE 22. English chemist & physicist discovered hydrogen. - HENRY CAVENDISH 23. From whta school did the nursing board topnotch of 2007 came from? -OUR LADY OF FATIMA 24. Which type of matter has a definite volume but no definite shape? -MATTER
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Starbucks Corporation Since implementing its supplier social responsibility standards in 2006‚ Starbucks has engaged in more than 500 factory assessments and continues to work with more than 70 factories on improving their social and environmental standards. As part of its 2015 global-responsibility goals‚ Starbucks aims to volunteer one million community service hours globally. Starbucks has achieved LEED certification for 116 stores in 12 countries‚ with 69 per cent of company-owned stores
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