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... Enthalpy and Internal Energy We know that ∆H = qp (at constant pressure) Since, ∆E = q + w, if the volume is held constant, no pressurevolume work can be done on that system or by that system. work = - Pext∆V = 0 at constant volume Hence, for constant volume processes, ∆E = qv ...
... Enthalpy and Internal Energy We know that ∆H = qp (at constant pressure) Since, ∆E = q + w, if the volume is held constant, no pressurevolume work can be done on that system or by that system. work = - Pext∆V = 0 at constant volume Hence, for constant volume processes, ∆E = qv ...
chemistry advanced may 2010 marking scheme
... CH4 is neutral since it does not accept or donate protons. (0.5) NH3 is a base since it accepts protons to form NH4+. (0.5) H2S is an acid donating a proton to form HS- (0.5); the HS- ion is a very weak acid and donates the proton only to very strong bases (0.5) (ii) Write chemical equations for the ...
... CH4 is neutral since it does not accept or donate protons. (0.5) NH3 is a base since it accepts protons to form NH4+. (0.5) H2S is an acid donating a proton to form HS- (0.5); the HS- ion is a very weak acid and donates the proton only to very strong bases (0.5) (ii) Write chemical equations for the ...
g - Valencia College
... cannot be created or destroyed. The energy of an isolated system must be ...
... cannot be created or destroyed. The energy of an isolated system must be ...
Scientific Measurement
... A rigid cylinder with a movable piston contains a 2 L sample of neon gas at STP. What is the volume when its temperature is increased to 30˚C while its pressure is decreased to 90 kPa? _____47. I can solve problems using the combined gas law. ...
... A rigid cylinder with a movable piston contains a 2 L sample of neon gas at STP. What is the volume when its temperature is increased to 30˚C while its pressure is decreased to 90 kPa? _____47. I can solve problems using the combined gas law. ...
Review for Physical Science Test #2
... 1. Compounds are made of ______________________ of elements that are _______________________________ together. 2. What are two ways that atoms can be bonded together? (Hint: both have to do with electrons.) ...
... 1. Compounds are made of ______________________ of elements that are _______________________________ together. 2. What are two ways that atoms can be bonded together? (Hint: both have to do with electrons.) ...
Eötvös Loránd Science University Faculty of Sciences Department of
... solve during the semester. The report of the microproject is supposed to be written in a journal publication style. (Week 1 serves to subscribe to or drop courses); (Week 2): Lecture 1 What is physical chemistry, and what part of it is chemical thermodynamics. Historical overview of thermodynamics a ...
... solve during the semester. The report of the microproject is supposed to be written in a journal publication style. (Week 1 serves to subscribe to or drop courses); (Week 2): Lecture 1 What is physical chemistry, and what part of it is chemical thermodynamics. Historical overview of thermodynamics a ...
UA-CHEM 127: Advanced General Chemistry I
... rather then volumes. This number could be expressed as moles, or even as individual molecules. The statement then reads: 3H2 + N2 −→ 2NH3 This is an example of a balanced chemical equation. What does it mean to be balanced? It means that the law of conservation of mass is obeyed – equal quantities o ...
... rather then volumes. This number could be expressed as moles, or even as individual molecules. The statement then reads: 3H2 + N2 −→ 2NH3 This is an example of a balanced chemical equation. What does it mean to be balanced? It means that the law of conservation of mass is obeyed – equal quantities o ...
Unit 5 Notes
... encounters the OH- and precipitates as Fe(OH)2(s). The Fe(OH)2 is eventually oxidized to a complex mixture of Fe2O3 and H2O by the O2 in the air. Rust is Fe2O3.XH2O where ‘X’ can change. Rust can have numerous different colours (red, brown, yellow, black) since differing numbers of water molecules a ...
... encounters the OH- and precipitates as Fe(OH)2(s). The Fe(OH)2 is eventually oxidized to a complex mixture of Fe2O3 and H2O by the O2 in the air. Rust is Fe2O3.XH2O where ‘X’ can change. Rust can have numerous different colours (red, brown, yellow, black) since differing numbers of water molecules a ...
chemistry 110 lecture
... NaHCO3(s) + H2SO4(aq) J Na2SO4(aq) + H2O (l) + CO2 (unbalanced) Molar Masses are: MM-NaHCO3 =83.91 MM-H2SO4-98.07 MM-Na2SO4=141.84 ...
... NaHCO3(s) + H2SO4(aq) J Na2SO4(aq) + H2O (l) + CO2 (unbalanced) Molar Masses are: MM-NaHCO3 =83.91 MM-H2SO4-98.07 MM-Na2SO4=141.84 ...
Chapter 5 Alt Notes 0910
... Thermodynamics is the study of the changes in energy and transfers of energy that accompany chemical and physical processes. In this chapter we will address 3 fundamental questions. Will two (or more) substances react when they are mixed under specified conditions? If they do react, what energy chan ...
... Thermodynamics is the study of the changes in energy and transfers of energy that accompany chemical and physical processes. In this chapter we will address 3 fundamental questions. Will two (or more) substances react when they are mixed under specified conditions? If they do react, what energy chan ...
Energy and Chemical Reactions - Thermochemistry
... Bottom-line: For any reaction that can be written as the sum of simpler reactions, ∆Hrxn is the sum of the heats from the individual reactions. ...
... Bottom-line: For any reaction that can be written as the sum of simpler reactions, ∆Hrxn is the sum of the heats from the individual reactions. ...
Basic Concepts of the Gas Phase
... combination of temperature and pressure. (It is also possible to select other state variables to define the state of the system, e.g. its values for density ρ and viscosity μ, which – in that case – would fix p and T). Two phases can only co-exist at equilibrium for specific combinations of temperat ...
... combination of temperature and pressure. (It is also possible to select other state variables to define the state of the system, e.g. its values for density ρ and viscosity μ, which – in that case – would fix p and T). Two phases can only co-exist at equilibrium for specific combinations of temperat ...
Chemical equilibrium
In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time. Usually, this state results when the forward reaction proceeds at the same rate as the reverse reaction. The reaction rates of the forward and backward reactions are generally not zero, but equal. Thus, there are no net changes in the concentrations of the reactant(s) and product(s). Such a state is known as dynamic equilibrium.