Standard enthalpy - Study guides, Class notes & Summaries
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CHEM191 Module 2 Exam Questions With 100% Correct Answers
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CHEM191 Module 2 Exam Questions With 
100% Correct Answers 
What is kinetic energy? - answerenergy of motion 
what is potential energy? - answerenergy of relative position 0 chemical bonds act as a store 
of potential energy 
what happens in terms of heat when a chemical reaction happens? - answerheat (q) is either 
absorbed or released by the reaction. 
what is enthalpy? - answerthe heat of reaction measured under conditions of constant 
pressure. 
how can the change in enthalpy be determined? ...
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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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MCAT General Chemistry (Princeton Review) Questions and Answers | Latest Update | 2024/2025 | Already Passed
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MCAT General Chemistry (Princeton 
Review) Questions and Answers | Latest 
Update | 2024/2025 | Already Passed 
 
What is the role of a Lewis acid and a Lewis base in a chemical reaction? 
 
 A Lewis acid is an electron pair acceptor, while a Lewis base is an electron pair donor. They 
interact to form a coordinate covalent bond where the base donates an electron pair to the acid. 
 
How does the concept of bond enthalpy relate to the strength of a chemical bond? 
 Bond enthalpy (or bond dissoci...
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A LEVEL CHEMISTRY WITH VERIFIED QUESTIONS AND ANSWERS Weak acid - an acid that is only slightly ionised/dissociated in aqueous solution Oxidation - loss of electrons Reduction - gain of electrons Ionic bonding - The electrostatic attraction between op
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A LEVEL CHEMISTRY WITH VERIFIED QUESTIONS AND ANSWERS 
 
Weak acid - an acid that is only slightly ionised/dissociated in aqueous solution 
 
Oxidation - loss of electrons 
 
Reduction - gain of electrons 
 
Ionic bonding - The electrostatic attraction between oppositely charged ions 
 
Covalent bonds - sharing of a pair of electrons 
 
Electronegativity - the ability of an atom to attract the electrons in a covalent bond 
 
Relative atomic mass - The weighted mean mass of an atom of an element ...
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HVAC Test 1 Latest Update Graded A+
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HVAC Test 1 Latest Update Graded A+ 
 
Absorption A refrigeration cycle where input energy is heat 
 
Adiabatic without gain or loss of heat 
 
Air Conditioning controlling air temperature humidity and quality 
 
Air Cooled Condenser a heat exchanger that transfers building heat to outdoor air 
 
Air Handler air moving equipment that can change air temperature humidity and quality 
 
BTU British thermal unit. 1 BTU will increase the temperature of 1 lb of water 1 degree F 
 
BTUH Rate of heat fl...
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Chemistry Terms- A21 with verified definitions(latest update)|GUARANTEED SUCCESS
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Lattice enthalpy 
The enthalpy change when one mole of an ionic compound is converted to gaseous ions. 
 
 
 
Enthalpy of atomisation 
The enthalpy change when one mole of gaseous atoms is formed from the element in its standard state 
 
 
 
 
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First electron affinity 
The enthalpy change when one mole of gaseous atoms is converted into gaseous ions with a single negative c...
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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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Chem 152 - midterm 2 - UW Complete Questions And Answers
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System - The portion of the universe we have singled out for study 
surroundings - Everything else in the universe 
universe - System and surroundings 
work - the action of a force through a distance 
heat - Transfer of energy from hotter to colder object 
heat capacity - The amount of heat needed to raise the temperature by 1 K 
Heat Tax - Increase in surroundings comes from the heat from the system 
Kinetic energy - Energy of motion 
potential energy - Energy of an object by virtue of its posi...
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4.1 Lattice Enthalpy Exam Questions and Verified Answers | Passed | A+
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first ionization energy 
: The energy required to convert one mole of gaseous atoms into gaseous atoms with a 
single positive charge 
standard enthalpy of formation 
: the enthalpy change when 1 mole of a compound is formed from its elements in their 
standard states under standard conditions 
Standard Enthalpy of Atomisation 
: The enthalpy change when one mole of gaseous atoms is formed from an element in 
its standard state 
Lattice enthalpy 
: The enthalpy change that occurs when one mol...
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AQA A LEVEL Chemistry questions and answers 100% guaranteed success.
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AQA A LEVEL Chemistry questions and answers 100% guaranteed success. 
 
 
 
 
 
 
 
 
 
 
Relative atomic mass - correct answer. 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 - correct answer. Average mass of a molecule compared to 1/12th of the mass of a carbon-12 atom 
 
The Avogradro constant - correct answer. the number of particles in a mole 
 
ideal gas equation - correct answer. pV = nRT 
 
empirica...
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