Advanced Higher Unit 2- Chemical Reactions KHS Chemistry Jan 2001/Oct 2006 page 6 Equilibria Q1 The value for the equilibrium constant, K, for a specific example of the following reaction is equal to 1: acid + alcohol ⇋ ester + water a) i) Predict the maximum yield of ester, given this value of K. 1 ii) Give one reason why this yield might not be achieved in practice.
Advanced Higher Unit 2- Chemical Reactions KHS Chemistry Nov 2006 page 5 Thermodynamics Q3 In a catalytic reformer, straight-chain alkanes are converted to branched chains, cycloalkanes and aromatic hydrocarbons. Consider the sequence shown below. a) Use the data in the table below to calculate ΔSθ for the conversion of octane to o-xylene and hydrogen at 298K.
Advanced Higher Chemistry - Unit 1. Teacher 157 terms. gw09robertsondougla2. Preview. Advanced Higher Chemistry - Organic. 192 terms. Mairi314. Preview. chemistry test 3. 11 terms. kevin2833. Preview. Electrophilic Addition to Nonpolar π Bonds: Reactions Involving Cyclic Transition States. 31 terms. Elizabeth_Frazier474.
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2) Ionisation energies (first and second) of calcium. 3) Enthalpy changes of solid iodine to iodine ions - molar enthalpy of atomisation and the electron affinity (the enthalpy change when one mole of electrons is added to one mole of isolated atoms in the gaseous state).
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Organic Chemistry; Save. Advanced Higher Chemistry - Unit 2. Flashcards; Learn; Test; Match; Get a hint. Covalent Bond. Formed when two half filled atomic orbitals overlap to form a molecular orbital. ... Shape of alkene molecule when 3 sigma bonds are formed from 3 sp^2 hybrid orbitals. Non Polar.
Advanced Higher Chemistry Stoichiometry . Stoichiometry This section of Unit 2 relies on the ability to write formulae and balanced equations correctly. Any reaction in which the substances react completely according to the mole ratios given by a balanced ...
Advanced Higher Chemistry UNIT 2 Mechanisms. Save. Flashcards. Learn. Test. Match. Get a hint. Monohalogenoalkanes can undergo nucleophilic substitution reactions with aqueous alkalis to form what? What is the nucleophile in this reaction? What is the reagent used?
Advanced Higher Unit 2- Chemical Reactions KHS Chemistry Oct 2007 page 2 Stoichiometry Previous Knowledge The amount of a substance is denoted by the symbol ‘n’ and it has the units ‘mols’. One mole is defined as that amount of substance which contains as many elementary entities as there are atoms in exactly 12g of carbon-12 ( 12C ).
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Advanced Higher Unit 2- Chemical Reactions KHS Chemistry Dec 2006 page 5 Kinetics b) Draw the graph of the rate against the concentration of dinitrogen pentoxide. Use the graph produced in b) to answer the following questions. i) What is the rate expression for this reaction. ii) What is the order of the reaction with respect to dinitrogen pentoxide. iii) Find the value of the rate constant.
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1 Advanced Higher Chemistry Unit 2 Applications of Hess’s Law 1 Born – Haber Cycles. 2 Born - Haber Cycles The enthalpy of formation is the energy change when 1 mole of a substance is formed from its constituent elements at standard conditions. e.g. Mg(s) Cl2(g) MgCl2(s ...
Advanced Higher Unit 2- Chemical Reactions KHS Chemistry Nov 2009 page 2 Thermochemistry 3. THERMOCHEMISTRY Hess's Law 2.65 Thermochemistry concerns the study of changes in energy which occur during chemical reactions. 2.66 The First Law of Thermodynamics states that energy is conserved. 2.67 Hess’s law states that the overall reaction enthalpy is the sum of the
Advanced Higher Unit 2- Chemical Reactions KHS Chemistry Oct 2007 page 2 Stoichiometry Previous Knowledge The amount of a substance is denoted by the symbol ‘n’ and it has the units ‘mols’. One mole is defined as that amount of substance which contains as many elementary entities as there are atoms in exactly 12g of carbon-12 ( 12C ).
