conjugate acid (or base) of any Brønsted–Lowry base (or acid). © IBO 2007 and oxonium ion). In these terms the above equation becomes HX (aq) + H2O (l) H3O+ (aq) + X– (aq) One of the first theories to explain the fact that all acids had similar reactions‚ was that of Arrhenius. This proposed that in aqueous solution all acids‚ to some extent (dependent on the strength of the acid)‚ split up to form a hydrogen ion and an anion‚ i.e. for an acid HX: This also emphasises the fact that water is
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4 Identify the oxidizing and reducing agents in redox equations. Same as figuring 9.1.4 9.3.1 Deduce a reactivity series based on the chemical behaviour of group of oxidizing and reducing agents. A species is more reactive than another if it easily loses it electrons e.g. Zn + Cu2+ → Zn2+ + Cu‚ Zn is more reactive than Cu 9.3.2 Deduce the feasibility of a redox reaction from a given reactivity series. For a redox reaction to
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the entire semesters work. Chemistry 1. Label the following on a periodic table: a) Alkali metals b) Alkaline earth metals c) Halogens d) Noble gases 2. Indicate the metals‚ non-metals and metalloids. -38100431803. Show the trends for reactivity and atomic radius. 4. Which of the following elements has the largest atomic radius? Why? a) fluorine b) oxygen c) nitrogen d) calcium Calcium has the largest atomic radius as it has 3 rings of electrons‚ while the rest of the
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HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers Chapter 25 Simple molecular substances with non-octet structures and shapes of simple molecules Page Number Class Practice 1 Chapter Exercise 2 Chapter 26 Bond polarity Class Practice 4 Chapter Exercise 5 Chapter 27 Intermolecular forces Class Practice 7 Chapter Exercise 9 Chapter 28 Structures and properties of molecular crystals Class Practice 11 Chapter Exercise 12 Part Exercise 14 Chapter 29 Chemical cells in daily life
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’ Define the term voids. What type of stochiometric defect is shown by (i) ZnS and (ii) CsCl? [Hint. : (i) Frenkel defect (ii) Schottky defect] *10. If the formula of a compound is A2B‚ which sites would be occupied by A ions? [Hint. : Number of A ions is double to B ions‚ so ions will occupy tetrahedral voids] 11. What is the coordination number for (a) (b) an octahedral void a tetrahedral void. [Hint. : (a) 6; (b) 4 ] *12. How many octahedral voids are there in 1 mole of a compound having cubic
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II PUC – CHEMISTRY (34) MODEL QUESTION PAPER - 1 Time: 3hours 15 minutes Maximum marks: 70 Instructions: 1. The question paper has four parts: A‚ B‚ C and D. All parts are compulsory. 2. Write balanced chemical equations and draw labeled diagrams wherever required. 3. Use log tables and the simple calculator if necessary. (Use of scientific calculators is not allowed) PART-A I. Answer ALL of the following. (Each question carries 1 mark) 10x1=10 (Answer each question in one word or
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white precipitate during the barium chloride test‚ indicating that sulphate ions are present. The chemical equation for this reaction is: Fe2(SO4)3(aq) + BaCl2(aq) FeCl3(s) +
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ical Chemistry 1.which of the following pairs of compound will react? iC3H6+Br2 iiC3H6+Cl2 in sunlight iiiC3H6+H2O in the presence of sulphuric acid ivC3H6+H2O in the presence of concentrated sulphuric acid a.i b.i‚iii c.i‚ii‚iii d.all 2.liqiud y reacts with magnesium metal to produce a gas that burns with a pop sound when a flaming wooden splint is placed near it.liqiud y is most likely a compound that has the formula a.c2h5oh b.hcooh c.h3cooch3 d.c6h14 3.a compound p has the
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HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers |Chapter 25 Simple molecular substances with non-octet |Page Number | |structures and shapes of simple molecules | | |Class Practice |1 | |Chapter Exercise
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RADIATION HISTORY Basic Terminology Radiation - A form of energy carried by waves or stream of particles (photons) X-radiation - A high-energy radiation produced by the collision of a beam of electrons with a metal target in an x-ray tube High-energy Radiation - A form of radiation that is able to pass through substances (e.g. the human body) X-ray - A beam of energy that has the power to penetrate substances and record image shadows on photographic film Radiology
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