Bond enthalpies - Study guides, Class notes & Summaries
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AQA AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry Question Paper + Mark scheme [MERGED] June 2022 *JUN227404201* IB/M/Jun22/E7 7404/2 For Examiner’s Use Question Mark 1
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AQA 
AS 
CHEMISTRY 
7404/2 
Paper 2 Organic and Physical Chemistry 
Question Paper + Mark scheme [MERGED] 
June 2022 
*JUN* 
IB/M/Jun22/E7 7404/2 
For Examiner’s Use 
Question Mark 
1 
2 
3 
4 
5 
6 
7 
Section B 
TOTAL 
Time allowed: 1 hour 30 minutes 
Materials 
For this paper you must have: 
• the Periodic Table/Data Sheet, provided as an insert (enclosed) 
• a ruler with millimetre measurements 
• a scientific calculator, which you are expected to use where appropriate. 
Instructions...
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AQA AS CHEMISTRY Paper 2 Organic and Physical Chemistry for MAY 2023
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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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MCAT General Chemistry | Latest Update | 2024/2025 | Already Passed
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MCAT General Chemistry | Latest Update 
 
| 2024/2025 | Already Passed 
 
What is the role of the conjugate base in an acid-base reaction, and how does it influence the 
reaction equilibrium? 
 The conjugate base is formed when an acid donates a proton. It influences the reaction 
equilibrium by interacting with the acid, shifting the equilibrium based on the relative strengths 
of the acid and its conjugate base. 
 
How does the presence of a common ion affect the solubility of a salt in a solu...
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ACS Chemistry Final general Chem 1 Review 63 Questions with Verified Answers,100% CORRECT
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ACS Chemistry Final general Chem 1 Review 63 Questions with Verified Answers 
 
Density - CORRECT ANSWER mass / volume 
 
Conversion from celsius to kelvin - CORRECT ANSWER K = DegC + 273.15 
 
Conversion from DegF to DegC - CORRECT ANSWER DegC = (5/9) (DegF - 32) 
 
Conversion from DegC to DegF - CORRECT ANSWER DegF = (9/5)(DegC) + 32 
 
Intensive properties - CORRECT ANSWER Independent of amount of matter examined 
 
Extensive propertires - CORRECT ANSWER Dependent of amount of matter examined...
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Final Inorgo Exam Questions And Complete Correct Answers Graded A+.
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Consider ionic compound, MX3, composed of generic metal M and generic gaseous halogen X. 
Enthalpy of formation of MX3 =-701kJ/mol 
 
enthalpy of sublimation of M= 177 kJ/mol 
 
1st, 2nd, and 3rd ionization energies of M=625 kJ/mol, 1583 kJ/mol, and 2469 kJ/mol 
 
Electron affinity of X =-315kJ/mol 
 
bond energy of X2= 183kJ/mol 
 
Determine the lattice energy of MX3 - correct answer lattice energy = -4885 kJ/mol 
enthalpy of sublimation is -701 
bo...
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MCAT Practice Exam Questions and Answers Updated 2023/2024 Graded 100%
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MCAT Practice Exam Questions and Answers Updated 2023/2024 Graded 100%. What type of bond is usually disrupted during denaturation of proteins? H bond 
Is uracil a purine or pyrimidine? Pyrimidine (A is a purine, so must be paired with a 
pyrimidine, also U replaces T, and T is a pyrimidine) 
Are peptide bonds highly reactive? NO, they are very stable 
(T/F): Bomb calorimetery is a good way to determine bond enthalpies within a compound. 
FALSE - would need a ton of info 
What is the approximate...
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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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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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MCAT Practice Exam Questions and Answers Latest 2023/2024 | 100% Correc
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MCAT Practice Exam Questions and Answers Latest 2023/2024 | 100% Correct. Thin layer chromatography can use silica plates which are very polar. Will polar or non polar 
substances have lower Rf values on this plate? Polar substances - they will have a higher 
affinity for the silica and thus will not travel as far as the non polar substances 
A titration of a strong acid with a strong base or vice versa has an equivalence point around what 
pH? 7 
What type of bond is usually disrupted during de...
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