Standard enthalpy changes - Study guides, Class notes & Summaries

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 Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:15 Full screen Brainpower Read More First electron affinity The enthalpy change when one mole of gaseous atoms is converted into gaseous ions with a single negative c...

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...

Thermodynamics the study of energy transformations thermochemistry applied field to chemical reactions energy the ability to do work or transfer heat work energy used to cause an object that has mass to move heat energy used to cause the temperature of an object to change enthalpy the heat energy absorbed or released by a system during a constant-pressure process deltaH entropy A measure of the dispersion of energy or randomness in a system ...

Which contains more energy: 25 g of boiling water at 100⁰C or 25 g of steam at 100⁰C? a. 25 g of boiling water at 100⁰C b. 25 g of steam at 100⁰C c. Both contain the same amount of energy. d. The relative amounts of energy cannot be determined from the information given. b. 25 g of steam 100⁰C Which of the following statements best explains the fact that the change in internal energy (∆Ε) equals the difference of the final value and the initial value? a. the value of in...

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...

Unit 30: Understand the Principles of Chemistry for Biological and Medical Science Unit code: A/600/9714 QCF Level 3: BTEC National Credit value: 10 Guided learning hours: 60 Aim and purpose The aim of this unit is to enable learners to be familiar with basic chemical concepts which underpin biology and biomedical professions. Unit introduction Biochemistry and physiology are essential components of the pre-clinical curriculum for veterinary and biomedical sciences: a base knowl...

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 ...

Unit 27: Chemistry for Biology Technicians Unit code: K/502/5557 QCF Level 3: BTEC National Credit value: 10 Guided learning hours: 60 Aim and purpose This unit aims to provide learners with an understanding of the principles of chemistry for biology technicians and how these can be put into practice. This unit is primarily aimed at learners within a centre-based setting looking to progress into the sector or to further education and training. Unit introduction Biology technician...

Matter Most basic building block. Must have mass and volume Elements Simplest form of matter, can't decompose any further Molecules Two or more atoms "linked" together Compounds Mixes of two or more elements bonded together Sig Fig.- x & / As many as the least number Sig Fig.- + & - As many as the least behind the decimal point Law of Definite Composition Components in a compound always have the same ratio by mass Law of Multiple Proportions Ratios of elements that combine to m...

General Chemistry ACS Study Guide 69 Questions with Verified Answers Isotopes - CORRECT ANSWER when the number of neutrons varies but it has the same number of protons ex) Ne-20 and Ne-22` What was believed until the beginning of the 20th century? - CORRECT ANSWER That all physical phenomena were deterministic Light - CORRECT ANSWER Form of electromagnetic radiation What is electromagnetic radiation composed of? - CORRECT ANSWER perpendicular oscillating waves, one for the magnetic f...