Entropy and enthalpy Study guides, Revision notes & Summaries

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? ...

CEM 142 EXAM 1 LATEST UPDATE GRADED A+ bond BREAKING ABSORB energy from surroundings -requires energy to overcome bond FORMING RELEASE energy to surroundings effective nuclear charge charge felt by valence electrons -increase in ENC attracts electrons more strongly toward the nucleus Coulomb's Law opposite charges attract -like charges repel F=kq1q2/r^2 electron pair geometry SHAPE INCLUDING LONE PAIRS -count as bonds molecular shape not including lone pairs ...

Which of the following is not a unit of energy? A) BTU B) Meters C) Joules D) Calories correct answers B) Meters Which of the following sources of energy is non-renewable? A) Solar B) Nuclear fission C) Nuclear fusion D) Wind correct answers B) Nuclear Fission Which of the following is a unit of power? A) Watt B) Kilograms C) Newton D) Grams correct answers A) Watt What is the capacity to do work known as? A) Energy B) Entropy C) Efficiency D) Enthalpy correct answers A)...

Thermodynamics question and answers 2023/24 update Question 1. Hesss law is an application of (a) 1st law of Thermodynamics (b) 2nd law of Thermodynamics (c) Entropy change (d) ∆H = ∆U + P∆V. Question 2. 5 mole of an ideal gas expand isothermally and irreversibly from a pressure of 10 atm to 1 atm against a constant external pressure of 1 atm. Wirr at 300 K is: (a) -15.921 kJ (b) -11.224 kJ (c) -110.83 kJ (d) None of these Question 3. At absolute zero the entropy of a perf...

AP BIOLOGY EXAM 2024 QUESTIONS AND ANSWERS Water characteristics - Correct Answer ️️ -polar, cohesion (hold together), adhesion (hold to another substance), surface tension, specific heat, heat of vaporization Surface Tension - Correct Answer ️️ -A measure of how difficult it is to stretch or break the surface of a liquid Specific Heat - Correct Answer ️️ -amount of heat absorbed or lost to change temperature by 1C Heat of Vaporization - Correct Answer ️️ -the quantity of ...

Thermodynamics question and answers 2023/24 update Question 1. Hesss law is an application of (a) 1st law of Thermodynamics (b) 2nd law of Thermodynamics (c) Entropy change (d) ∆H = ∆U + P∆V. Question 2. 5 mole of an ideal gas expand isothermally and irreversibly from a pressure of 10 atm to 1 atm against a constant external pressure of 1 atm. Wirr at 300 K is: (a) -15.921 kJ (b) -11.224 kJ (c) -110.83 kJ (d) None of these Question 3. At absolute zero the entropy of a perf...

Which elements account for more than 97% of the weight of most organisms? A) C, H, N, Mg, O, S B) C, H, N, O, P, S C) C, H, N D) Fe, C, H, O, P E) Ca2+, K+, Na+, Mg2+, ClAnswer: B Page Ref: Section 2 2) Proteins in biological membranes may be A) porous. B) attached to the membrane surface. C) span the membrane. D) All of the above E) B and C only Answer: D Page Ref: Section 3 3) Which statement about cellulose is false? A) It is the most abundant polysaccharide in nature. B) Its...

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...

What is a metabolic pathway? - Answer-A pathway that a molecule goes through, resulting in a specific product. What is metabolism? - Answer-The totality of an organisms chemical reactions Gibbs free energy - Answer-Portion of a system that can perform work when temp and pressure are uniform throughout the system. What is a way to show change in free energy? - AnswerWhat does a negative Delta G mean? - Answer-A process that is spontaneous What does spontaneous mean? - Answer-Means that a pr...

ACS Physical Chemistry Thermochemistry Study Guide |Question and Answer| 100% Correct What is the third law of thermodynamics? *Ans* The entropy of a perfect crystal is zero. What is the second law of thermodynamics? *Ans* As a whole, the universe always tends towards increasing entropy. What is the relationship between number of microstates and entropy? *Ans* More microstates = higher entropy What is the relationship between temperature and entropy? *Ans* Temperature increases, en...