Enthalpy change - Study guides, Class notes & Summaries
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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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BCH 403 final exam questions 2023 Questions with Complete Solutions
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Exam 1 Correct Answer- 
 
A reaction consists of a reactant "R" being converted into a product "P". The change in enthalpy of the conversion is 5 kJ/mol, while the change in entropy is 35 kJ/mol. Therefore, thermodynamic coupling is not required for this reaction to reach an equilibrium. 
True/False Correct Answer-True 
 
Which of the following is true regarding a reaction that has a ΔG° = 0. 
The concentrations of the reactants and products are equal. 
The reaction will eventually arriv...
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BioChem 210 Module 2 Exam - Portage Learning
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BioChem 210 Module 2 Exam - Portage 
Learning 
1. The pH of a solution of 0.0010 M NaOH is:: 11 (Kw=[H+][OH-] = 
1.0 x 10-14; 
[H+][0.0010] = 1.0 x 10-14 [H+]=1.0 x 10-11; pH=-log[1.0 x 10- 
11]=11) 
2. Water is a unique molecule. Which of the following 
contributes to water's unique place in the chemical world?: 
All of the answers are correct 
3. The bent shape of water is due to ______________.: The 
unshared electron pairs on the oxygen atom 
4. Which diagrams correctly represent ...
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IB chemistry HL Latest Version Graded A+
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IB chemistry HL Latest Version Graded 
 
A+ 
 
exothermic reaction heat is released by the system 
ΔΗ<0 
 
endothermic reaction heat is absorbed by the system 
ΔΗ>0 
 
standard enthalpy change of reaction(ΔΗ) the heat energy transferred under standard 
conditions (pressure-101.3 kPa, temperature- 298 K) 
 
combustion and neutralization are exothermic processes 
 
average bond enthalpy the energy required to break one mole of a certain type of bond in the 
gaseous state averaged acro...
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FE EXAM QUESTIONS AND ANSWERS
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15 kg/s of air are compressed from 1 atm and 300K (enthalpy of 300.19 kJ/kg) to 2 atm and 900K (enthalpy of 732.93 kJ/kg). Heat transfer is negligible. The air compressor's power output is most nearly 
 
(A) 5.6 MW 
(B) 6.5 MW 
(C) 7.6 MW 
(D) 8.9 MW - Answer-B 
 
What is most nearly the weight in lbf if a 1.00lbm object in a gravitational field of 27.5ft/s^2? 
 
(A) 0.85lbf 
(B) 1.2lbf 
(C) 28lbf 
(D) 32lbf - Answer-A 
 
A rocket that has a mass of 4000 lbm travels at 27,000 ft/sec. What is mo...
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ACS PHYSICAL CHEMISTRY THERMOCHEMISTRY STUDY GUIDE QUESTIONS WITH CORRECT ANSWERS
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What is the third law of thermodynamics? Correct Answer The entropy of a perfect crystal is zero. 
 
What is the second law of thermodynamics? Correct Answer As a whole, the universe always tends towards increasing entropy. 
 
What is the relationship between number of microstates and entropy? Correct Answer More microstates = higher entropy 
 
What is the relationship between temperature and entropy? Correct Answer Temperature increases, entropy increases (direct) 
 
What is the relationship be...
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IB Chemistry Topic 5 Latest Update Graded A+
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IB Chemistry Topic 5 Latest Update 
 
Graded A+ 
 
Enthalpy The amount of heat released (exothermic) or absorbed (endothermic) during a 
chemical reaction (the energy needed for the reaction to occur) 
This can be lowered with the presence of a catalyst. 
 
Change in Enthalpy Hproducts -Hreactants 
 
Specific heat equation c= q in Joules (or Change in H)/mass(g)(change in temp) 
 
Specific heat of water 4.18 J/gdegreesC 
**NOTE: Usually in kJ 
 
Endothermic v. Exothermic Endothermic: Absorbing e...
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Chem Exam: Types of Calculation Questions & Answers 100% Verified
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Chem Exam: Types of Calculation Questions & Answers 100% Verified 
Calorimetry Calculations: 
1. 2.50 kJ of energy changes the temperature of a sample of lead by 8.52 degrees C. What is the mass of 
the sample? - ANS-Q = mcΔT 
m=Qc/Δt 
m = 2500/0.13(8.52) 
= 2.3×103 g 
2. 950.3 J of energy is removed from 28.5 g of water at 80.3 degrees C. What is the final temperature? - 
ANS-Q = mcΔT 
−950.3 = 28.5(4.18)(T2 − 80.3) 
T2 = −950.3/(28.5)(4.18) + 80.3 
= 72.3O C 
3. A 30.56 g sample...
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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 paper 2 Questions & Correct Answers/ Graded A+
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elative atomic mass (Ar) 
: Average mass of an atom compared with one twelth of the mass of an atom of carbon 
12 
Electronegativity 
: Power of an atom to attract the pair of electrons in a covalent bond 
Standard enthalpy of combustion 
: Enthalpy change when 1 mole of a substance burns completely in oxygen under 
standard conditions with all reactants and products being in their standard state 
Standard enthalpy of formation 
: Enthalpy change when 1 mole of a compound is formed from it's ...
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