Enthalpies Study guides, Revision 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 A-level CHEMISTRY 7405/3 Paper 3 Question Paper + Mark scheme [MERGED] June 2022 *JUN227405301* IB/M/Jun22/E16 7405/3 For Examiner’s Use Question Mark 1
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AQA 
A-level 
CHEMISTRY 
7405/3 
Paper 3 
Question Paper + Mark scheme [MERGED] 
June 2022 
*JUN* 
IB/M/Jun22/E16 7405/3 
For Examiner’s Use 
Question Mark 
1 
2 
3 
4 
5 
Section B 
TOTAL 
Time allowed: 2 hours 
Materials 
For this paper you must have: 
• the Periodic Table/Data Booklet, provided as an insert (enclosed) 
• a ruler with millimetre measurements 
• a scientific calculator, which you are expected to use where appropriate. 
Instructions 
• Use black ink or black ball-point...
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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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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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Chem 162 Experiment #3: Intermolecular Forces Part II: Vapor Pressure and Enthalpy of Vaporization - GRADED A+
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Chem 162 Experiment #3: Intermolecular Forces 
Part II: Vapor Pressure and Enthalpy of Vaporization 
PURPOSE (4 pts) 
The purpose is to measure the enthalpies of vaporazation of pentane, diethyl ether, butanone, and 2-butanol. For 
each of these molecules, a portion of the enthalpy of vaporization is due to dispersion forces (all molecules have 
dispersion forces) and the other to a polar component. In the boxes provided below, draw the structural formula for 
each molecule (should be drawn by h...
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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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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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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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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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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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