A short description of the major steps is given below and a process flow chart is shown on the next page. Pickling: Hot rolled coils have a layer of oxide on their surface. Pickling ensure removal of surface oxides by chemical treatment using hydrochloric acid‚ prior to the cold rolling process. Production lines have an edge-trimming facility and built-in features to avoid under/over pickling. For high production of strips of 1.2 mm to 6.5 mm thickness‚ continuous lines are
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pollutants of concern include lead‚ chromium‚ mercury‚ uranium‚ selenium‚ zinc‚ arsenic‚ cadmium‚ gold‚ silver‚ copper and nickel. These toxic materials may be derived from mining operations‚ refining ores‚ sludge disposal‚ fly ash from incinerators‚ the processing of radioactive materials‚ metal plating‚ or the manufacture of electrical equipment‚ paints‚ alloys‚ batteries‚ pesticides or preservatives. Heavy metals such as zinc‚ lead and chromium have a number of applications in basic engineering
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Sc Science test KEY STAGE 3 TIER 5–7 Paper 2 First name Last name School ________________________________________________ ________________________________________________ ________________________________________________ Remember 2009 I I I I I The test is 1 hour long. You will need: pen‚ pencil‚ rubber‚ ruler‚ protractor and calculator. The test starts with easier questions. Try to answer all of the questions. The number of marks available for each question is given below
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used to treat gastrointestinal disorders includes: 1. Products for altering gastric pH 2. Protectives for intestinal inflammation 3. Adsorbents for intestinal toxins 4. Cathartics of laxatives for constipation ANTACIDS o neutralize excess hydrochloric acid o inactivate the proteolytic enzyme‚ pepsin o alkaline bases Results of Hyperacidity: o Gastritis – inflammation of the gastric mucosa o Peptic ulcer – specified circumscribed erosion a. Duodenal ulcer – duodenum (perforation) b. Gastric
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Mixing of two solutions. 55 Class IX EXPERIMENT No: 9 AIM: To study the external features of root‚ stem‚ leaf and flower of monocot and dicot plants. Material Required : Plants of Hibiscus/Peturnia/rose/pea and grass/maize/bamboo/lily or‚ any other ornamental herb with flower and fruits‚ simple or dissecting microscope‚ hand lens‚ slide‚ coverslip and razor /blade. Procedure : 1. 2. 3. Observe the differences in the external features of stem‚ leaf‚ root‚ flowers and seeds. To study the leaf‚ see
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N12/4/CHEMI/SPM/ENG/TZ0/XX 88126104 CHEMISTRY standard level Paper 1 Friday 9 November 2012 (afternoon) 45 minutes INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question‚ choose the answer you consider to be the best and indicate your choice on the answer sheet provided. • The periodic table is provided for reference on page 2 of this examination paper. • The maximum mark for this examination
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in their natural state‚ and recorded their apparent physical properties. I then tested the substances to determine how they react when their natural environments were altered. The pure substances were tested to see how they reacted with added Hydrochloric Acid‚ Dilute NaOH‚ heat‚ cold and hot water. I also was to determine if the substances were acidic or basic after being heated in water‚ by using litmus paper. Section 4: Data Tables |Solubility or Reaction
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Edexel IGCSE Chemistry Revision Notes IGCSE Chemistry Triple Award Revision Guide Topic Introduction to chemistry Atomic Structure Structure and Bonding – Ionic Bonding Structure and Bonding – Covalent and Metallic Bonding Organic Chemistry - Alkanes Organic Chemistry – Alkenes / Addition Polymerisation Organic Chemistry – Alcohols / Condensation Polymerisation Calculations Periodic Table Reactivity Series and Metal Extraction Electrolysis Energetics Acids‚ Bases‚ Salts and Neutralisation Preparing
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Surname Centre No. Initial(s) Paper Reference 4 3 3 5 Candidate No. 2 H Signature Paper Reference(s) 4335/2H Examiner’s use only London Examinations IGCSE Team Leader’s use only Chemistry Paper 2H Higher Tier Tuesday 6 November 2007 – Morning Time: 2 hours Question Leave Number Blank 1 2 3 4 5 Materials required for examination Nil Items included with question papers Nil 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number‚ candidate number‚ your surname
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etc. ½ 5. Activity : Metal Q is added to salt solution of P. Q being more reactive ; displaces metal P from its salt solution. Chemical equation : Metal Q + Salt solution of P → Salt solution of Q + Metal P. Example : Zn Zinc + CuSO4 → ZnSO4 + Cu 1 Copper sulphate Zinc sulphate Copper 1 6. 1 volt is the potential difference between two points in a current carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to another. 1 Potential difference = =
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