Enthalpy of combustion Study guides, Revision notes & Summaries
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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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HESI A2 CHEMISTRY-CHRISJAY FILES (1) (1)
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HESI A2 ENTRANCEEXAM 
FOR 
CHAMBERLAINCOLLGE 
OF NURSING 
2023 QUESTIONS WITH 
ANSWERS 
CHEMISTRY 
HESI A2 CHEMISTRY V1/V2 FILE 
1. If a Hydrogen isin a compound, what would its oxidation number be? 
+1 
2. What isthe oxidation number of any simple ion? 
+1 or -1 depending on the charge of the ion 
3. How many kilograms are in a pound? 
0. kg 
4. What is the temperature for freezing point of water in Celsius? 
0 degrees Celsius (32°F for Fahrenheit) 
5. What is the conversion of Celsius to Fah...
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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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OCR AS LEVEL CHEMISTRY A H032/02 DEPTH IN CHEMISTRY ACTUAL 2024 EXAM V1 ACCURATE QUESTIONS AND ANSWERS 100% COMPLETE CHECK THE LAST PAGE FOR ANSWERS
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OCR AS LEVEL CHEMISTRY A H032/02 DEPTH IN CHEMISTRY 
ACTUAL 2024 EXAM V1 
ACCURATE QUESTIONS AND ANSWERS 100% COMPLETE 
CHECK THE LAST PAGE FOR ANSWERS 
1	This question is about nickel and its compounds. 
(a)	Nickel reacts with dilute hydrochloric acid in a redox reaction. Ni(s) + 2HCl (aq)	NiCl 2(aq) + H2(g) 
Explain, in terms of the number of electrons transferred, whether nickel is oxidised or reduced. 
 
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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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Chemistry Straighterline questions and answers 100% guaranteed success.
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Chemistry Straighterline questions and answers 100% guaranteed success. 
 
 
 
 
 
 
 
 
 
 
An endothermic reaction causes the surroundings to: 
A. warm up 
B. become acidic 
C. condense 
D. decrease in temperature 
E. release CO2 - correct answers.D 
 
An exothermic reaction causes the surroundings to: 
A. warm up 
B. become acidic 
C. expand 
D. decrease its temperature 
E. release CO2 - correct answers.A 
 
Copper metal has a specific heat of 0.385 J/g•oC and has a melting point of 1083oC....
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OCR A Level CHEMISTRY Exam with Guaranteed Correct Answers
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Test for carbonates - correct answer - add dilute HCL 
- it makes carbon dioxide 
test for carbon dioxide by bubbling it through lime water 
 
Test for ammonium ions - correct answer -add sodium hydroxide 
-warm the mixture 
-hover damp red litmus paper over it , if it turns blue the ions are present 
 
Test for sulphate ionz (SO4 2-) - correct answer - add dilute HCL 
- then add BaCl2 
- BaSO4 is made which is insoluble in water so a white precipitate will be formed 
 
Test for Halides (Cl-,...
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CHEM1011 Week 9 Questions With Complete Solutions
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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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IME Steam Quiz- USMMA Latest Version Graded A
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IME Steam Quiz- USMMA Latest Version 
 
Graded A 
 
Chemical Energy energy stored in the fuel 
 
Thermal Energy energy from the combustion process 
 
Mechanical Energy energy used to move an object 
 
Boiler's do what? -Converts chemical energy into thermal energy 
-Outputs low & high energy steam to the steam turbines & other steam operated equipment 
 
Conduction heat transfer through a solid; through tube walls. Flows from hotter to cooler. 
 
Convection heat transfer through a medium, liqui...
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AP CHEM FINAL EXAM | Complete Updated Answered Solution guide 2023.
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AP CHEM FINAL EXAM | Complete Updated Answered Solution guide 2023. 
 
6.1 For a classroom demonstration, a chemistry teacher puts samples of two different pure solid powders in a beaker. The teacher places the beaker on a small wooden board with a wet surface, then stirs the contents of the beaker. After a short time the students observe that the bottom of the beaker is frozen to the wood surface. The teacher asks the students to make a claim about the observation and to justify their claims. W...
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