AQA A LEVEL CHEMISTRY EXAM 2024
mean bond enthalpy - ANSWER-The energy required to break a covalent bond
into gaseous atoms averaged over different molecules
Bonds broken - bonds made
activation energy - ANSWER-The minimum amount of energy needed to start a
chemical reactio...
AQA A LEVEL CHEMISTRY EXAM 2024 mean bond enthalpy - ANSWER -The e nergy required to break a covalent bond into gaseous atoms averaged over different molecules Bonds broken - bonds made activation energy - ANSWER -The minimum amount of energy needed to start a chemical reaction catalyst - ANSWER -A substance that increases the rate of a chemical reaction without being changed by providing an alternative reaction pathway by lowering activation energy Le Chatelier's principle - ANSWER -When a system in dynamic equilibrium is subject ed to change, the position of equilibrium will shift to oppose the change. oxidising agents - ANSWER -electron acceptors reducing agents - ANSWER -electron donors Enthalpy of formation - ANSWER -Enthalpy change when one mole of a compound is formed from it s constituent elements under standard conditions in their standard states Enthalpy of atomization - ANSWER -The energy required to produce one mole of gaseous atoms from an element in its standard state Electron affinity - ANSWER -the enthaply change when one mole of gaseous atoms forms one mole of -1 ions Lattice enthalpy of formation - ANSWER -Enthalpy change when one mole of a solid ionic compound is formed from its constituent ions in the gas phase Relative atomic mass - ANSWER -The average mass of an atom of an element, relative to 1/12th of the mass of an atom of Carbon -12 Relative molecular mass - ANSWER -Average mass of a molecule compared to 1/12th of the mass of a carbon -12 atom The Avogradro constant - ANSWER -the number of particles in a mole ideal gas equation - ANSWER -pV = nRT empirical formula - ANSWER -the simplest whole number ratio of atoms of each element in a compound percentage atom economy - ANSWER -(Mass of desired product/total mass of reactants) x 100 ionic bonding - ANSWER -the electrostatic attraction between oppositely charged ions in a lattice covalent bond - ANSWER -a shared pair of electrons between non -metal elements co-ordinate bond - ANSWER -a shared pair of electrons where both electrons are supplied by one atom repulsion in shapes of molecules - ANSWER -Lone pair -lone pair > lone pair -
bonding pair > bonding pair -bonding pair electronegativity - ANSWER -the power of an atom to attract the pair of electrons in a covalent bond hess' law - ANSWER -Total enthalpy change for a reaction is independent of the route chosen Lattice enthalpy of dissociation - ANSWER -Energy chang e when 1 mol of an ionic lattice dissociates to its gaseous ions. standard electrode potential - ANSWER -298K 100kPa 1.00moldm -3 Electrode reactions in lithium cell (positive electrode) - ANSWER -Li+ + CoO2 + e - → Li+[CoO2] - Electrode reactions in lithi um cell (negative electrode) - ANSWER -Li → Li+ + e - Oxidation of primary alcohols - ANSWER -Aldehyde (Alcohol in excess + product distilled off immediately) Carboxylic acid (oxidising agent in excess + Under reflux ) Oxidation of secondary alcohols - ANSWER -Ketones No further oxidati on
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller nazariuswanjohi209. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $25.89. You're not tied to anything after your purchase.
