Enthalpy of combustion Study guides, Revision notes & Summaries
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CHEM1011 Week 9 Questions And Answers
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Standard enthalpy of formation correct answer: enthalpy change when it is made from the stable form of its elements at standard condition 
 
combustion enthalpy correct answer: exothermic, so always negative 
 
atomisation enthalpy correct answer: endothermic, so always positive 
 
∆H(rxn)= correct answer: ∑∆Hºf(products) - ∑∆Hºf(reactants) 
 
standard enthalpy of formation correct answer: change of enthalpy during the formation of one mole of the substance from its constituent ...
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A level chemistry paper 2 questions and answers latest top score.
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A level chemistry paper 2 questions and answers latest top score. 
 
 
 
 
 
 
 
 
 
 
 
 
 
Silver nitrate+ nitric acid + chloride ions - ANS.White precipitate 
 
Silver nitrate+ nitric acid + bromide ions - ANS.Cream precipitate 
 
Silver nitrate+ nitric acid + iodide ions - ANS.Yellow precipitate 
 
Substances that decolorise bromine water - ANS.Alkenes 
 
Electrophiles - ANS.Electron pair acceptors, attracted to electrons e.g H+ 
 
NaF and NaCl - ANS.Produces misty fumes wi...
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HESI_A2_Science_Cram_Plan cliff notes complete latest update A+ grade solutions.
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Introduction 
About the HESI Admission Assessment Exam (HESI A2) About This Book 
Retaking the Exam 
A Note from the Author 
 
 
Chapter 1: Cram Plan Study Calendars 
Determining Your HESI A2 Cram Plan Two-Month Cram Plan 
One-Month Cram Plan One-Week Cram Plan 
The Night Before and the Day of the HESI A2 
 
 
Chapter 2: Biology Diagnostic Test 
Answer Key 
Answer Explanations 
 
 
Chapter 3: Chemistry Diagnostic Test 
Answer Key 
Answer Explanations 
 
 
Chapter 4: Anatomy and Physiology Di...
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C125 EXAM-QUESTIONS WITH CORRECT ANSWERS
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C125 EXAM-QUESTIONS WITH CORRECT ANSWERS 
 
3.Write a balanced chemical equation noting all species and states of matter 
 
4.Break up any aqueous compound into its ions to write the total ionic equation (including states of matter) 
 
5.Cancel out any spectator ions 
 
6.Write the remaining species as the net ionic equation 
 
Endothermic - Answer- - Absorbs heat from the surroundings 
 
- Becomes colder; requiring a gain of energy 
 
Exothermic - Answer- - Releases energy to it surroundings 
 ...
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3.1.4 Energetics, A Level Chemistry, AQA questions with complete solutions.
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3.1.4 Energetics, A Level Chemistry, AQA questions with complete solutions. 
 
 
 
 
 
 
 
 
 
 
 
What is enthalpy change? - ANS.Heat energy transferred in a reaction at constant pressure 
 
What are standard conditions for enthalpy change? - ANS.100kPa and stated temperature (normally 25 degrees celcius) 
 
What values of deltaH do exothermic reactions have? - ANS.Negative (less than 0) 
 
What values of deltaH do endothermic reactions have? - ANS.Positive (more than 0) 
 
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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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Applied Science level 3 BTEC Chemistry Test Prep Questions and Answers
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exothermic reaction A reaction that releases more energy in the form of heatchemical energy the energy required to break or make bonds 
 
exothermic reaction A reaction that releases more energy in the form of heat 
 
what is the enthalpy change of an exothermic reaction negative 
 
endothermic reaction A reaction in which more energy is absorbed 
 
what is the enthalpy charge of an endothermic reaction positive 
 
what will happen to the enthalpy diagrams when a catalyst is added less activatio...
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4th Class ABSA Exam Part A Practice Questions And Answers Solved 100% Correct!!
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4th Class ABSA Exam Part A Practice Questions And Answers Solved 100% Correct!! 
Absolute pressure is: 
gauge pressure plus atmospheric pressure 
 
 
The motion of moving parts is _____ by friction: 
 
A: Prevented 
B: Improved 
C: controlled 
D: resisted 
E: Regulated 
D: resisted 
 
 
Voltage is 
a) the rate of current flow 
b) the rate of electron flow 
c) electromotive force 
d) Kinetic energy 
e) A form of power 
c) electromotive force 
 
 
The resistance of a conductor is affected by: 
 
1...
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CHEM133 Week 16 Final Exam (Spring)
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1.	Question: Calculate the lattice energy of NaBr(s), given the following thermochemical equations, where ΔIE and ΔEA are ionization energy and electron affinity, respectively. 
2.	Question: In which case is the bond polarity incorrect? 
3.	Question: The phosphorus atom in PCl3 would be expected to have a 
4.	Question: Which of the following bonds would be the most polar without being considered ionic? 
5.	Question: Calculate the standard enthalpy of formation (ΔHformation) for LiCl(s) given ...
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OCR A-level Chemistry (Test questions with error-free answers)
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Electronegativity correct answers The tendancy of an atom to attract the bonding pair of electrons in a covalent bond 
 
Radical correct answers A molecule, atom or ion with an unpaired electron 
 
Acid (bronsted lowry theory) correct answers A molecule or atom that can donate a proton 
 
Base correct answers A molecule or atom which can act as a proton acceptor 
 
Alkali correct answers A water soluble base 
 
Standard Conditions correct answers 298 K, 100 kPa, 1 moldm^-3 
 
Standard enthalpy c...