w w ap eP m e tr .X w om .c s er June 2003 INTERNATIONAL GCSE MARKING SCHEME MAXIMUM MARK: 40 SYLLABUS/COMPONENT: 0620/01 CHEMISTRY (Multiple Choice) Page 1 Mark Scheme IGCSE EXAMINATIONS – June 2003 Syllabus 0620 Question Number Key Question Number Key 1 2 3 4 5 C B A D A 21 22 23 24 25 B D A B D 6 7 8 9 10 C A A B C 26 27 28 29 30 B D D D B 11 12 13 14 15 B D C D
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two simple patterns. Name of polyatomic ion | Formula and charge | Ammonium ion | NH4+ | Acetate ion | C2H3O2- | Cyanide ion | CN- | Hydroxide ion | OH- | Nitrate ion | NO3- | Chlorate ion | ClO3- | Sulfate ion | SO42- | Carbonate ion | CO32- | Phosphate ion | PO43- | * Pattern 1: The -ates “ate” one more oxygen than the -ites and their charge doesn’t change as a result! For instance‚ if you know nitrate is NO3-‚then nitrite is NO2-.If you know phosphate is PO43-‚then you know
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Mobile No. P & T No. Fax No. e-mail address e-mail address SMS Alerts Interested in (Please tick): Ferrous / Non ferrous / Store/ Idle assets/ Chemicals/ Iron Ore Seller Y/ Material of interest N Bhilai Matl Y/N Matl Y/N Matl Plate Pooled Iron (CI) Ammonium
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Natural resource Natural resources (economically referred to as land or raw materials) are naturally forming substances that are considered valuable in their relatively unmodified (natural) form. A natural resource’s value rests in the amount and extractability of the material available and the demand for it. The latter is determined by its usefulness to production. A commodity is generally considered a natural resource when the primary activities associated with it are extraction and purification
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I. SUMMARY OF THE PROJECT A. NAME OF THE BUSINESS Demeter Farm Supplies Demeter is the goddess of corn‚ grain‚ and the harvest. She is the daughter of Cronus and Rhea. It is Demeter that makes the crops grow each year. The first loaf of bread from the harvest is sacrificed to her. Demeter is the goddess of the earth‚ of agriculture‚ and of fertility in general. Sacred to her are livestock and agricultural products‚ poppy‚ narcissus and the crane. Demeter is intimately associated with the seasons
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Name the process B - d) What is the catalyst used in process B? - e)Write the chemical of fertiliser Z? - 4 Ammonia is a valuable source in the manufacture of ammonium fertilisers. a) State one example of ammonium fertiliser -Ammonium nitrate
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Managing the Root Zone in Soilless Culture Author: Eyal Ronen Haifa Chemicals Chief Agronomist In solid growing media‚ there are five important parameters that should be monitored around the root zone to optimize plant growth and yields. EYAL RONEN offers some guidelines on how to manage these parameters to prevent major crop problems‚ and explains the importance of measuring fertiliser solution at both the dripper and drainage points. General terminology Soilless culture‚ commonly referred to as
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Polyatomic Ions that Must be Memorized for General Chemistry Polyatomic Cation: NH4+ ammonium ion Polyatomic Anions Ionic Charge: Oxyanions: ClO4– perchlorate ion ClO3– chlorate ion – ClO2 chlorite ion ClO– hypochlorite ion -1 Ionic Charge: Oxyanions that Contain Hydrogen: HCO3– bicarbonate ion or hydrogen carbonate ion HSO4– bisulfate ion or hydrogen sulfate ion NO3– NO2– nitrate ion nitrite ion MnO4– permanganate ion H2PO4– Others: CN– dihydrogen
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Heterotrophs 3. Nitrogen cycle On the cycle diagram label the following: a. Nitrogen (N2) b. Nitrogen fixing bacteria c. Nitrification d. Denitrification e. Ammonia (NH3) & Ammonium ion (NH4+) f. Nitrates (NO3 -) g. Nitrites (NO2 -) h. Fertilizers i. Assimilation j. Decomposition k. Biota waste l. Autotrophs m. Heterotrophs 4. Phosphorus cycle On the cycle diagram
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1. (a) State what ecologists mean by the following terms: (i) habitat ................................................................................................................ [1] (ii) niche ................................................................................................................ [1] (iii) ecosystem. ................................................................................................................ ..............................................
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