Enthalpy Study guides, Class notes & Summaries
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A Level Chemistry Edexcel Unit 8 - Energetics I notes written by a 3A* Imperial College London Medicine Student
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Detailed notes on Unit 8 - Energetics I covering all the specification points, and allowed me to achieve an A* in chemistry. Covers enthalpy changes, thermochemical equations, Hess's law, Hess cycles, example calculations, standard enthalpy of formation, reaction, combustion, neutralisation and atomisation, bond enthalpy calculations with examples and enthalpy titrations.
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CHEM 210 MODULE 3 EXAM QUESTIONS AND CORRECT ANSWERS, WITH COMPLETE SOLUTION 2024.
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CHEM 210 MODULE 3 EXAM QUESTIONS AND CORRECT ANSWERS, WITH COMPLETE SOLUTION 2024. 
 
What is meant by the term average bond enthalpy? 
(Average enthalpy change) when one mole of bonds 
 
of (gaseous covalent) bonds is broken 
The calculated value of ΔHc from this experiment is different from the value obtained 
from data books. 
Apart from heat loss, suggest two reasons for the difference. 
Assume that the calculation has been carried out correctly. 
incomplete combustion 
non-standard conditi...
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Chem 1311 Exam 3 ACC Professor Rahman 2023 with 100% correct answers
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A __________ ΔH corresponds to an __________ process. 
 
-zero, endothermic 
-positive, exothermic 
-negative, endothermic 
-zero, exothermic 
-positive, endothermic correct answerspositive, endothermic 
 
Which one of the following is NOT considered a fossil fuel? 
 
-natural gas 
-hydrogen 
-anthracite coal 
-petroleum 
-crude oil correct answershydrogen 
 
Which one of the following statements is FALSE? 
 
-The enthalpy change for a reaction is equal in magnitude, but opposite in si...
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AQA CHEMISTRY A LEVEL WITH COMPLETE SOLUTIONS 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 molecu
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AQA CHEMISTRY A LEVEL WITH COMPLETE SOLUTIONS 
 
 
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 chang...
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CEM 142 EXAM 2 LATEST UPDATE GRADED A+
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CEM 142 EXAM 2 LATEST UPDATE 
 
GRADED A+ 
 
**ACID = ELECTRON PAIR ACCEPTOR 
 
Acid= electrophile 
 
**BASE = ELECTRON PAIR DONOR 
base= nucleophile 
 
strong acid fully ionizes in solution/completely dissociates 
 
weak acid does not fully ionize or dissociate into ions 
 
** negatively charged ion ---> wants to loose 1 electron 
 
can tell if a solution is ionized when... a fully ionized solution will conduct more electricity 
than a non fully ionized solution 
 
strength of acid depend...
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AQA A-Level Chemistry Exam (2024) || All Questions & Answers (Graded A+)
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AQA A-Level Chemistry Exam (2024) || All Questions & Answers (Graded A+) 
AQA A-Level Chemistry Exam (2024) || All Questions & Answers (Graded A+) 
 
Topic 1 - ANSWER - Atomic Structure 
 
Topic 2 - ANSWER - Amount of Substance 
 
State what is meant by the term molecular formula. - ANSWER - the actual no. atoms of each element in a compound 
 
Topic 3 - ANSWER - Bonding 
 
Explain why CF4 has a bond angle of 109.5°. - ANSWER - -there are 4 bonding pairs and no lone pairs 
-repel equally and th...
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Lattice energy Questions And Answers | 100% Correct Answers | 2024 Updated Quiz
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Lattice energy - - The enthalpy change when 1 mole of ionic compound is formed from its gaseous 
ions under standard conditions 
- It is the energy given out when ions of opposite charges comes together to form an ionic lattice 
Lattice energy is endothermic or exothermic? - - It is always exothermic because bonds are being 
formed (ionic bond) between oppositely charged ions, not broken 
Equation showing the formation of NaCl lattice - - Na^+(g) + Cl^-(g) > NaCl(s) 
The state of the opposite...
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Biology 1201 LSU Exam 2 Questions and Answers 100% Pass
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Biology 1201 LSU Exam 2 Questions and 
 
Answers 100% Pass 
 
What type of chemical reaction is without outside energy? Spontaneous (exergonic/downhill) 
NOT INSTANTANEOUS 
-decreasing enthalpy and increasing entropy 
 
What is the equation for Free Energy? deltaG=deltaH-TdeltaS 
-free enrgy=enthalpy-(temp.)(entropy;disorder) 
-high deltaS=low delta G 
 
Entropy Disorder: 
-breakdown: increase in disorder, more parts 
-synthesis: decrease in disorder, less parts 
-high entropy=low free energy 
 ...
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MCAT AAMC Question Packs Mixed ALL SOLUTION LATEST EDITION 2024 GUARANTEED GRADE A+
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temperature is related to KE how? 
temp is the average kinetic energy 
thermal energy is related to KE how? 
thermal energy is the total KE 
Brainpower 
enthalpy of fusion is ALWAYS greater than enthalpy of vaporization because? 
it has to break more bonds (solid --> liquid) 
the amount of heat depends on (2 factors) 
1. the type of substance 
2. the amount of the substance 
during a phase change does temperature change? 
NO 
if an archaebacerial species lives in a pool that is 0.01 M HCL wh...
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BTEC Unit 5 – Chemistry Questions Graded A+
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Enthalpy of combustion (∆Hc) - ANSWER-The enthalpy change that occurs when one mole of a substance is burnt completely in oxygen under standard conditions 
 
Enthalpy of Formation (∆Hf) - ANSWER-The enthalpy change that occurs when one mole of a substance is formed from its elements in their standard states under standard conditions 
 
Enthalpy - ANSWER-The thermal energy stored in a chemical system. It is defined by: 
 
Enthalpy = Internal energy of the system + (pressure x volume) 
 
H = U...
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