Enthalpy Study guides, Class notes & Summaries
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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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A Level Chemistry Edexcel Unit 8 - Energetics I notes written by a 3A* Imperial College London Medicine Student
- Summary • 17 pages • 2023
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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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6.1.3_Final_Exam__Semester_2_Exam 2023 complete with correct answers 100%
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6.1.3 Final Exam: Semester 2 Exam Chemistry Sem 2 
Points Possible: 100 Name: 
Date: 3/4/2023 
 
In this test, you will apply what you have learned in the semester. Answer the questions below. Submit this to your teacher when you are done. 
 
Show all your work on this test. 
 
Question 1: Energy in Matter (20 points) 
 
A.	A student put a bottle of water and a can of sugared soda in the freezer to chill them quickly. When she took them out, the bottle of water was frozen but the can of soda was...
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NATE CORE STUDY GUIDE(correct answers)to pass
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NATE CORE STUDY GUIDE(correct answers)to passWhich of the following is not the product of incomplete combustion: 
Oxides of nitrogen 
 
 
 
An oil trap is required at the base of the discharge line of the vertical riser is _____ or above 
8 feet 
 
 
 
A diode allows current to flow in one direction: 
True 
 
 
 
1 Watt = _____ Btu 
3.41 
 
 
 
Current in a closed circuit is limited by which of the following: 
resistance 
 
 
 
An oil separator is located in the _____: 
Discharge line 
 
 
 
___...
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How Can the Thermodynamics of Dissolution be Defined?, 1. Temperature, T 2. Heat, q: 3. Law of Conservation of Energy: 4. Enthalpy, H: 5. Entropy, S: 6. Gibbs Free Energy, G:
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How Can the Thermodynamics of Dissolution be Defined?, 1. Temperature, T 2. Heat, q: 3. Law of Conservation of Energy: 4. Enthalpy, H: 5. Entropy, S: 6. Gibbs Free Energy, G:
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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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