Enthalpy Study guides, Class notes & Summaries
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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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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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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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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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Summary Protein Science (AM_470145)
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This document consists of a summary of the course Protein Science, corresponding to the Master Biomolecular Science.
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Chem 142 Unit 1 Latest Update Graded A+
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Chem 142 Unit 1 Latest Update 
 
Graded A+ 
 
Thermodynamics The study of energy and its transformation 
 
Thermochemistry The study of chemical reactions and transformations and the energy 
changes that accompany these transformations 
 
Electrostatic Potential Energy Equation - k = constant 
 
- Q = the 2 charges (Eel is negative if the charges are opposite and positive if the charges are 
like) 
- d = distance between the two particles 
 
Potential Energy for like charges Repulsion; Positive;...
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A LEVEL Chemisrty June 2020 Paper 2 Questions From Real Exams
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A LEVEL Chemisrty June 2020 Paper 2 Questions 
From Real Exams 
1 
2 
Section A 
Answer all questions in this section. 
Do not write 
outside the 
box 
This question is about 1-chloropropane. 
. Define the term standard enthalpy of formation. 
[2 marks] 
. The equation for a reaction used to manufacture 1-chloropropane is 
3CH3CH2CH2OH(l) + PCl3(l) 3CH3CH2CH2Cl(l) + H3PO3(s) 
The enthalpy change for this reaction, ΔH, is –114 kJ mol–1 
Table 1 contains some standard enthalpy of formati...
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FE Electrical Exam Q&A
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define Enthalpy - Answer-total energy of a system 
 
Which of the following is true of the electric field intensity about an isolated point charge? 
A. It varies directly as the distance to the charge. 
B. It varies inversely as the distance to the charge. 
C. It varies directly as the square of the distance to the charge. 
D. It varies inversely as the square of the distance to the charge. - Answer-D. It varies inversely as the square of the distance to the charge. 
 
As a professional engin...
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Food Science Final Exam 2024 with 100% correct answers
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Sensory science is a discipline in which several senses are evoked, measured, analyzed and interpreted to know more about our foods. Which of the following senses may be studied? 
1. sight 2. hearing 3. touch 
4. smell 5. all of the above - correct answer 5. All of the above 
 
Which of the following is a factor affecting flavor perception? 
1. volatility of aroma compounds 
2. sensitivity of the individual 
3. non-volatile taste compounds 
4. interactions between compounds while chewing 5. ...
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AQA June 2020 QP - Paper 2 AQA Chemistry AS-level
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AQA June 2020 QP - Paper 2 AQA Chemistry AS-level 
AQA June 2020 QP - Paper 2 AQA Chemistry AS-level 
The equation for a reaction used to manufacture 1-chloropropane is 
3CH3CH2CH2OH(l) + PCl3(l) → 3CH3CH2CH2Cl(l) + H3PO3(s) 
The enthalpy change for this reaction, ΔH, is –114 kJ mol–1 
Table 1 contains some standard enthalpy of formation data
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