GCSE CHEMISTRY High Demand Questions THE PERIODIC TABLE QUESTIONSHEET 1 The boxes represent particles of different gases. One box shows the particles of elements in group 0 (group 8). A (a) (i) B C D What name is given to group 0 (8) elements? (ii) Name two elements from group 0. ......................................................................................................................................................................... [2] (b) (i) Which box
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unsaturated hydrocarbon with a double or triple carbon-carbon bond. | Bubble gas through‚ or add liquid to‚ a solution of bromine in hexane or water. | The orange/brown bromine rapidly decolourises‚ as a saturated colourless organic bromo-compound is formed. | R2C=CR2 + Br2 ==> BrR2C-CR2BrRCCR + 2Br2 ==> Br2RC-CRBr2R = H‚ alkyl or arylSaturated alkanes give no fast reaction with bromine. | Hydroxy group R-OH in alcohols and phenols (in ’dry’ conditions*) The first 3 tests (i) - (iii) given on the right
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Chapter 7 Matching Match each item with the correct statement below. a. halide ion e. valence electron b. octet rule f. coordination number c. ionic bond g. metallic bond d. electron dot structure ____ 1. an electron in the highest occupied energy level of an atom ____ 2. Atoms react so as to acquire the stable electron structure of a noble gas. ____ 3. a depiction of valence electrons around the symbol of an element ____ 4. an anion of chlorine or other halogen ____ 5. the force of attraction
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Electrolysis a) Electrolysis is the decomposition of a substance to give simpler substances. The substance being electrolysed has to be an ionic compound. b) The substance being decomposed is called the electrolyte. c) In electrolysis the electric current enters and leaves the electrolyte by conducting rods called electrodes. The positive electrode is called the anode and the negative electrode is called the cathode. d) For electrolysis to occur the electrolyte must be in liquid form so that
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w w ap eP m e tr .X w om .c s er UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education 0620/12 CHEMISTRY Paper 1 Multiple Choice May/June 2010 45 Minutes Additional Materials: *8778752636* Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction
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Chemistry : Important Questions For CBSE Class XII ( Haloalkanes and Haloarenes) (Q.1) Choose the incorrect statement about the benzyl chloride: ( 1 mark ) (a) It is less reactive than alkyl halides. (b) It can be oxidized to benzaldehyde by boiling with copper nitrate solution. (c) It is a lachrymatory liquid and answers beilstein’s test. (d) It gives a white precipitate with alcoholic silver nitrate (Q.2) Dry ether The reaction RX + 2Na + RX _______________? R-R + 2NaXis called. ( 1 mark
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Abstract Tamoxifen‚ most commonly sold under the brand name Nolvadex‚ is the most widely used drug in the treatment of breast cancer during both early and late stages. It belongs to a class of drugs known as SERMs (Selective Estrogen Receptor Modulators). SERMs work by blocking the estrogen receptors in breast cells to prevent any binding with estrogen. It is consumed orally as a tablet or as a liquid (Anon.‚ 2017). The following paper discusses the discovery of Tamoxifen‚ its laboratory synthesis
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The Grignard Synthesis of Triphenylmethanol Organic Chemistry Lab II March 19‚ 2012 Abstract The purpose of this experiment was to synthesize the Grignard reagent‚ phenyl magnesium bromide‚ and then use the manufactured Grignard reagent to synthesize the alcohol‚ triphenylmethanol‚ by reacting with benzophenone and protonation by H3O+. The triphenylmethanol was purified by recrystallization. The melting point‚ Infrared Spectroscopy‚ 13C NMR‚ and 1H NMR were used to characterize and confirm
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Chapman et.al (2009) studied the local impact of hoisted point sources on late spring aerosol driving and cloud-aerosol cooperations‚ in northeastern North America‚ was studied by utilizing the WRF-Chem community model. The immediate impacts of mist concentrates on approaching sun powered radiation were recreated utilizing existing modules to relate aerosol sizes and chemical composition to airborne optical properties. Direct impacts were reenacted by including a prognostic treatment of cloud bead
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M12/4/CHEMI/SP2/ENG/TZ1/XX/M MARKSCHEME May 2012 CHEMISTRY Standard Level Paper 2 13 pages –2– M12/4/CHEMI/SP2/ENG/TZ1/XX/M This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IB Cardiff. –3– M12/4/CHEMI/SP2/ENG/TZ1/XX/M General Marking Instructions Assistant Examiners (AEs) will be contacted by
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