Enthalpy change Study guides, Class notes & Summaries
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MCAT AAMC Question Packs Mixed ALL SOLUTION LATEST EDITION 2024 GUARANTEED GRADE A+
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temperature is related to KE how? 
temp is the average kinetic energy 
thermal energy is related to KE how? 
thermal energy is the total KE 
Brainpower 
enthalpy of fusion is ALWAYS greater than enthalpy of vaporization because? 
it has to break more bonds (solid --> liquid) 
the amount of heat depends on (2 factors) 
1. the type of substance 
2. the amount of the substance 
during a phase change does temperature change? 
NO 
if an archaebacerial species lives in a pool that is 0.01 M HCL wh...
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CEM 142 EXAM 2 LATEST UPDATE GRADED A+
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CEM 142 EXAM 2 LATEST UPDATE 
 
GRADED A+ 
 
**ACID = ELECTRON PAIR ACCEPTOR 
 
Acid= electrophile 
 
**BASE = ELECTRON PAIR DONOR 
base= nucleophile 
 
strong acid fully ionizes in solution/completely dissociates 
 
weak acid does not fully ionize or dissociate into ions 
 
** negatively charged ion ---> wants to loose 1 electron 
 
can tell if a solution is ionized when... a fully ionized solution will conduct more electricity 
than a non fully ionized solution 
 
strength of acid depend...
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100 Biochemistry Exam 1 Questions with correct answers. Graded A
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100 Biochemistry Exam 1 Questions with correct answers. Graded A 
Document Content and Description Below 
100 Biochemistry Exam 1 Questions with correct answers Which of the following is found in RNA but not DNA A) Uracil B) Guanine C) Deoxyribose D) Phosphate E) Adenine >>>>Uracil Which of the fo llowing amino acids exhibits significant ultraviolet absorption above 250 nm? A) Alanine B) Tyrosine C) Methonine D) Glycine E) All of the above >>>>Tyrosine Collagen fibers hav...
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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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Chem 142 Unit 1 Latest Update Graded A+
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Chem 142 Unit 1 Latest Update 
 
Graded A+ 
 
Thermodynamics The study of energy and its transformation 
 
Thermochemistry The study of chemical reactions and transformations and the energy 
changes that accompany these transformations 
 
Electrostatic Potential Energy Equation - k = constant 
 
- Q = the 2 charges (Eel is negative if the charges are opposite and positive if the charges are 
like) 
- d = distance between the two particles 
 
Potential Energy for like charges Repulsion; Positive;...
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PORTAGE LEARNING CHEM 210 exams 1-8 and final exam
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Portage Learning CHEM 210 exams 1-8 and final exam 
 
Question 1 
3 / 3 pts 
 
True or False: According to the Module, a compound with a molecular mass of 1,000 g/mol is considered a macromolecule. 
 
 
 
True Correct! 
False Question 2 
3 / 3 pts 
True or False: Biomolecules can have only two functional groups. 
 
True Correct! 
False Question 3 
3 / 3 pts 
 
True or False: The following functional group is an alcohol. 
 
 
 
 
 
True Correct! 
False Question 4 
3 / 3 pts 
 
True or False: In ...
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Chemistry Thermodynamics Test Review || All Questions & Answers (Graded A)
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Chemistry Thermodynamics Test Review || All Questions & Answers (Graded A)Chemistry Thermodynamics Test Review || All Questions & Answers (Graded A)Chemistry Thermodynamics Test Review || All Questions & Answers (Graded A) 
What is the change in entropy? - ANSWER - Delta S 
 
What is the change in free energy? - ANSWER - Delta G 
 
What is the change in enthalpy? - ANSWER - Delta H 
 
What heat received by the chemical system from its surroundings? - ANSWER - Q as in Q=mcp(delta)T 
 
The interna...
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CEM 142 First Exam Latest Update Already Passed
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CEM 142 First Exam Latest Update 
 
Already Passed 
 
Define and give examples of open, closed and isolated systems Open system-both matter and 
energy can enter or leave (beaker without a lid, pour your hot drink into a mug) 
 
Closed system- the amount of matter is constant and only energy can enter or leave (cup of 
coffee with a lid on it) 
 
Isolated systems- neither energy nor matter would move between the system and the 
surroundings (Styrofoam coffee cup with a lid on) 
 
Explain the dif...
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OCR AS LEVEL CHEMISTRY B (SALTERS) H033/02 CHEMISTRY IN DEPTH ACTUAL 2024 EXAM PREDICTION WITH ACCURATE QUESTIONS AND ANSWERS. A+ GUARANTEED.CHECK THE LAST PAGE FOR ANSWERS.
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OCR AS LEVEL CHEMISTRY B (SALTERS) H033/02 CHEMISTRY IN DEPTH 
ACTUAL 2024 EXAM PREDICTION WITH ACCURATE QUESTIONS AND ANSWERS. 
A+ GUARANTEED.CHECK THE LAST PAGE FOR ANSWERS. 
1	Disposable lighters use butane (C4H10). Heat energy is released when the butane is burned. 
Some students wish to determine the enthalpy change of combustion (cH) of butane. They use the apparatus below. 
 
 
 
thermometer clamp 
 
metal can water 
 
disposable lighter 
 
 
butane 
 
 
The mass of the lighter is meas...
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A LEVEL Chemisrty June 2020 Paper 2 Questions From Real Exams
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A LEVEL Chemisrty June 2020 Paper 2 Questions 
From Real Exams 
1 
2 
Section A 
Answer all questions in this section. 
Do not write 
outside the 
box 
This question is about 1-chloropropane. 
. Define the term standard enthalpy of formation. 
[2 marks] 
. The equation for a reaction used to manufacture 1-chloropropane is 
3CH3CH2CH2OH(l) + PCl3(l) 3CH3CH2CH2Cl(l) + H3PO3(s) 
The enthalpy change for this reaction, ΔH, is –114 kJ mol–1 
Table 1 contains some standard enthalpy of formati...