any patience with the serious work of life which‚ now that it stood between me and my desire‚ seemed to me child’s play‚ ugly monotonous child’s play. (See Important Quotations Explained) SummaryThe narrator‚ an unnamed boy‚ describes the North Dublin street on which his house is located. He thinks about the priest who died in the house before his family moved in and the games that he and his friends played in the street. He recalls how they would run through the back lanes of the houses and hide
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Chapter 4 — Intro—1 1 CHAPTER 3 Topic Scopes: Stoichiometry and Solution Concentration • Molarity‚ molality‚ parts per million & percentage (w/w‚ w/v and v/v) • Stoichiometry calculation • Limiting reactant • Theoretical yield‚ actual yield and percentage yield 1 2 Mole Concept No. of Moles = Molarity (M) • Molarity (molar concentration) is the number of moles of a solute that is contained in 1 liter of solution Mass (g) molar mass (g/mol) No. of Moles = Molarity (mol/L) volume (L) Molarity
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LEDs… Release only ONE color of light Produce very little heat What is an LED? They are semiconductor devices that can convert electrical energy directly into light due to the nature of the bonding that occurs in the semiconductor solid. Type of bonding is directly related to conductivity of solid. Bonding in Elemental Solids Electronegativity – the ability of an atom to attract electrons to itself. Atoms with low e.n. (metals) don’t hold valence electrons tightly valence
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and molecular orbital (MO) bond theories is correct? a) MO theory predicts that electrons are localized between pairs of atoms. b) In VB theory‚ bonding electrons are delocalized over the molecule. c) MO theory accurately describes bonding in O2 and NO‚ VB theory does not. d) VB theory can describe molecular bonding in excited states. e) MO theory is used to accurately predict the colors of compounds. Answer: c 9.2 Valence Bond Theory 2. Which of the following statements is/are
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ICT for Learning An International Perspective on the Irish Initiative Eileen Freeman‚ Bryn Holmes‚ Brendan Tangney. Centre for Research in IT in Education‚ Trinity College Dublin‚ Ireland. e-mail Tangney@tcd.ie Web www.crite.net Abstract “Where the appropriate systems of support are in place‚ then ICT can be experienced as a ‘transformative technology’ both for staff and for students [Comber & Lawson 1999‚ p 51]. Around the world governments are investing heavily in promoting the use
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County Council Council housing JFL Avenue‚ Portlaoise Social housing 057 866 4000 Traveller housing www.laois.ie Affordable housing Housing Assoc. Cluid H.A National office Social disadvantaged 37 Killarney St Dublin 1 01 707 2088 Housing Assoc. Genio Housing Trust Disabilities/Mental Marlinstown Office Pk Health Mullingar 044 938 5940 Midland Simon Old Parochial House Emergency House
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refrigeration‚ air conditioning‚ foam plastics‚ electronics cleaning‚ halon fire extinguishers Ozone- no direct sources; formed in photochemical smog Ozone in the Atmosphere Ozone is an allotrope of the element oxygen- main one being ordinary O2 gas It is poisonous to humans and other life forms when breathed in or come into contact with it Cause breathing difficulties‚ aggravating respiratory problems‚ premature fatigue and headache Stratosphere it is good because it protects all life forms
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Examples of synthesis reactions: 1. Metal + oxygen → metal oxide EX. 2Mg(s) + O2(g) → 2MgO(s) 2. Nonmetal + oxygen → nonmetallic oxide EX. C(s) + O2(g) → CO2(g) 3. Metal oxide + water → metallic hydroxide EX. MgO(s) + H2O(l) → Mg(OH)2(s) 4. Nonmetallic oxide + water → acid EX. CO2(g) + H2O(l) → ; H2CO3(aq) 5. Metal + nonmetal → salt EX. 2 Na(s) + Cl2(g) → 2NaCl(s) 6. A few nonmetals combine with each other. EX. 2P(s) + 3Cl2(g) →
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1. Which of the following statements about heat is false? A) If heat flows into a system‚ the extra energy of the system appears in the form of internal energy. B) A hot object possesses more heat than a cold object. C) If the system and surroundings are in thermal equilibrium‚ there is no heat flow between them. D) A process in which heat flows out of a system is said to be exothermic. E) Heat is a form of energy flow. B is false. If you compare a cup of water at 25oC and a bath tub of
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0.33 64 21 g 2 What mass of nitric oxide‚ NO‚ is present in a 2.5 L flask at a pressure of 100 kPa and 0ºC? mole NO 2.5/22.71 0.1101 mol mass NO 0.1101 30 3.3 g 3 Carbon monoxide burns in oxygen according to the equation: 2CO(g) O2(g) → 2CO2(g) Calculate the volume of oxygen required at 25°C and 100 kPa for the combustion of 28 g of carbon monoxide. moles CO 28/28 1 mol
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