Bond enthalpy - Study guides, Class notes & Summaries
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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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Honors Chemistry Unit 4 Test Questions and Answers 100% Pass
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Honors Chemistry Unit 4 Test Questions 
 
and Answers 100% Pass 
 
What is the term for the amount of energy released or absorbed during the formation of one mole 
of a compound from its elements in their standard states? 
 Standard Enthalpy of Formation 
 
What is the name of the process in which a substance dissolves in a solvent to form a 
homogeneous mixture? 
 Dissolution 
 
What is the term for the bond angle in a molecule with a tetrahedral geometry? 
 109.5 Degrees 
 
What is the name of...
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Honors Chemistry Final Exam Questions and Answers 100% Pass
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Honors Chemistry Final Exam Questions 
 
and Answers 100% Pass 
 
What is the term for the energy required to change a substance from a liquid to a solid at its 
freezing point? 
 Heat of Fusion 
 
What is the name of the process in which a gas turns directly into a solid? 
 Deposition 
 
What is the term for the property of a solution that describes the maximum amount of solute that 
can dissolve at a given temperature? 
 Solubility 
 
What is the name of the type of bond formed when electrons ...
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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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AQA A LEVEL Chemistry Questions & Correct Answers/ Graded A+
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Relative atomic mass 
: The average mass of an atom of an element, relative to 1/12th of the mass of an atom 
of Carbon-12 
Relative molecular mass 
: Average mass of a molecule compared to 1/12th of the mass of a carbon-12 atom 
The Avogradro constant 
: the number of particles in a mole 
ideal gas equation 
: pV = nRT 
empirical formula 
: the simplest whole number ratio of atoms of each element in a compound 
2 
percentage atom economy 
: (Mass of desired product/total mass of reactants) x 1...
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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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AQA A-Level Chemistry Exam (2024) || All Questions & Answers (Graded A+)
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AQA A-Level Chemistry Exam (2024) || All Questions & Answers (Graded A+) 
AQA A-Level Chemistry Exam (2024) || All Questions & Answers (Graded A+) 
 
Topic 1 - ANSWER - Atomic Structure 
 
Topic 2 - ANSWER - Amount of Substance 
 
State what is meant by the term molecular formula. - ANSWER - the actual no. atoms of each element in a compound 
 
Topic 3 - ANSWER - Bonding 
 
Explain why CF4 has a bond angle of 109.5°. - ANSWER - -there are 4 bonding pairs and no lone pairs 
-repel equally and th...
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BCH 330 Final CHUCK || very Flawless.
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Hydrophobic Effect correct answers _________ is the enthalpic and entropic energies contribute to the net free energy of stabilization of globular proteins. 
 
Mass Action correct answers The following equation is the analytical version of the principle of __________________________. 
ΔG = ΔG'o + R T lnQ, 
where Q = [C'][D'] / [A'][B'] 
 
Partition coefficient 
 
[It is a perturbation to the poise/balance of the participants in an equilibrium. 
 
(Take this into account to understand a...
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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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Honors Chemistry Unit 3 Questions and Answers 100% Pass
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Honors Chemistry Unit 3 Questions and 
 
Answers 100% Pass 
 
What is the term for the phenomenon where atoms in a molecule adopt specific spatial 
arrangements to minimize electron repulsion? 
 VSEPR Theory 
 
What is the name of the process in which a solid directly transitions to a gas without passing 
through the liquid phase? 
 Sublimation 
 
What is the term for the energy change that occurs when one mole of a compound is formed 
from its elements in their standard states? 
 
 Standard Ent...
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