Hess law Study guides, Revision notes & Summaries

Enthalpy of combustion (∆Hc) - ANSWER-The enthalpy change that occurs when one mole of a substance is burnt completely in oxygen under standard conditions Enthalpy of Formation (∆Hf) - ANSWER-The enthalpy change that occurs when one mole of a substance is formed from its elements in their standard states under standard conditions Enthalpy - ANSWER-The thermal energy stored in a chemical system. It is defined by: Enthalpy = Internal energy of the system + (pressure x volume) H = U...

Standard enthalpy of formation correct answer: enthalpy change when it is made from the stable form of its elements at standard condition combustion enthalpy correct answer: exothermic, so always negative atomisation enthalpy correct answer: endothermic, so always positive ∆H(rxn)= correct answer: ∑∆Hºf(products) - ∑∆Hºf(reactants) standard enthalpy of formation correct answer: change of enthalpy during the formation of one mole of the substance from its constituent ...

ASVAB-NAVY 1. Which of these reduces friction: ball bearings 2. When a lobster grows a claw to replace one that was lost, the process is called: regeneration 3. Any astronomical body that revolves around a larger body is called: satellite

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...

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...

Chemistry 115 Final Exam Questions with Verified Solutions Any ionic compound containing group IA or NH4+ cations are.... Always Soluble Ionic compounds containing NO3-, NO2-, ClO3-, ClO4-, C2H3O2-, & HCO3- anions are Always Soluble Ionic compounds containing Cl-, Br-, & I- anions are soluble EXCEPT when combined with... Ag, Hg, and Pb cations Ionic compound containing SO4^2- are soluble EXCEPT when combined with... Ag, Hg, Pb, Ca, Sr, Ba Ionic compounds containing So3^2-, S^2-, CO3^2-, PO4^...

Thermochemistry : the study of energy changes that occur during chemical reactions and changes in state bond enthalpy : the energy needed to break one mole of bonds in gaseous molecules under standard conditions Molar enthalpy : The enthalpy change associated with a physical, chemical or nuclear change involving one mole of a substance. Kinetic energy : energy of motion of particles in a substance heat 2 | P a g e : The energy transferred from one object to another Calorimetry ...

Thermochemistry - CORRECT ANSWER-the study of energy changes that occur during chemical reactions and changes in state bond enthalpy - CORRECT ANSWER-the energy needed to break one mole of bonds in gaseous molecules under standard conditions Molar enthalpy - CORRECT ANSWER-The enthalpy change associated with a physical, chemical or nuclear change involving one mole of a substance. Kinetic energy - CORRECT ANSWER-energy of motion of particles in a substance heat - CORRECT ANSWER-The energ...

ACS Chemistry Final Exam 182 Questions with Verified Answers Layout of an element (mass # & atomic #) - CORRECT ANSWER atomic number = - CORRECT ANSWER # of protons mass number = - CORRECT ANSWER # of protons + neutrons the number of protons in a neutral atom will equal the - CORRECT ANSWER # of electrons how to find the correct number of neutrons - CORRECT ANSWER mass number - atomic number Forms of the same elements that differ in amount of neutrons - CORRECT ANSWER isotopes...

Which of the following is true about the Nurse Competence in Aging (NCA) initiative? a. It was developed to support the professional development and leadership growth of nurses who provide care to older adults in long-term care. b. It developed resources for nurses to access evidence-based information on topics related to the care of older adults. c. It provides predoctoral and postdoctoral scholarships for study and research in geriatric nursing. d. It developed the first certification i...