Standard enthalpy - Study guides, Class notes & Summaries
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HESI A2 ENTRANCE EXAM: READING COMPREHENSION, CHEMISTRY, GRAMMAR, BIOLOGY, VOCABULARY & GENERAL KNOWLEDGE, CRITICAL THINKING, ANATOMY & PHYSIOLOGY AND MATH
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HESI A2 ENTRANCE EXAM: READING 
COMPREHENSION, CHEMISTRY, 
GRAMMAR, BIOLOGY, VOCABULARY 
& GENERAL KNOWLEDGE, CRITICAL 
THINKING, ANATOMY & PHYSIOLOGY 
AND MATH 
VERSION 2 
(With answers) 
Reading Comprehension 
Neurologists and biological psychologists have witnessed a sharp increase in the knowledge 
and understanding of particular structures of the brain over the past two decades. As technology 
becomes ever more advanced, scientists are able to isolate the functions of even small regions of ...
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RNAS C Practice Test Review 437 Questions with Verified Answers,100% CORRECT
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RNAS C Practice Test Review 437 Questions with Verified Answers 
 
A capacitor and resisitor in parallel - CORRECT ANSWER will have same voltage across since in parallel. 
if in series, voltage drops would occur 
 
they can be treated together 
 
If the absolute pressure of a gas is increased from 3 atm to 4 atm at constant volume, then the absolute temperature of the gas will increase by: 
A. 25%. 
B. 33%. 
C. 67%. 
D. 75% - CORRECT ANSWER B. Assuming the validity of the Ideal-Gas law, PV = n...
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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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Practicals Chemistry AQA A-level Rated A+
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Practicals Chemistry AQA A-level Rated A+ 
Required Practical 1 - titration and making a standard solution 
Making a standard solution 1. weigh the required mass of solid using a sample bottle on a 2 dp balance. 
2. transfer the solid into a beaker using distilled water to wash it out- preventing any solid remaining in the sample bottle. 
3. reweigh the sample bottle and work out the difference. 
4. Add 100cm3 of distilled water to the beaker to dissolve the solid (small volume of water) using a...
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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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Chemical & Physical Foundations of Biological Systems MCAT questions with correct answers
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In a barometer: if the external air force outweighs the weight of the mercury, then the column ______. If the external air force is less than the weight of the mercury, the column _____. Correct Answer-rises, drops 
 
proteins Correct Answer-amides are the functional groups present in: 
 
fructose-6-phosphate, glyceraldehyde-3-phosphate, NADPH, ribose-5-phosphate Correct Answer-list all the products of the PPP: 
 
going down periodic table due to greater size and polarizability Correct Answer-Nu...
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IB chemistry HL Latest Version Graded A+
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IB chemistry HL Latest Version Graded 
 
A+ 
 
exothermic reaction heat is released by the system 
ΔΗ<0 
 
endothermic reaction heat is absorbed by the system 
ΔΗ>0 
 
standard enthalpy change of reaction(ΔΗ) the heat energy transferred under standard 
conditions (pressure-101.3 kPa, temperature- 298 K) 
 
combustion and neutralization are exothermic processes 
 
average bond enthalpy the energy required to break one mole of a certain type of bond in the 
gaseous state averaged acro...
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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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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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Honors Chemistry Midterm Review Questions and Answers 100% Pass
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Honors Chemistry Midterm Review 
Questions and Answers 100% Pass 
 
What is the term for the process of a substance gaining electrons during a chemical reaction? 
 Reduction 
 
What is the name of the law that states that the pressure of a given mass of gas is directly 
proportional to its absolute temperature at constant volume? 
 Gay-Lussac's Law 
 
What is the term for a chemical reaction in which energy is absorbed from the surroundings? 
 Endothermic Reaction 
 
What is the name of the par...
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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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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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