chemistry advanced may 2010 marking scheme
... (i) State and explain briefly the acid–base properties (if any) of the substances. 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 donat ...
... (i) State and explain briefly the acid–base properties (if any) of the substances. 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 donat ...
Chemistry GCE Matravers School Sixth Form
... All external examinations will be at the end of the course; either AS level or the A level. The AS level and A level have been decoupled meaning that the AS level is a stand-alone qualification. If students sit the AS examinations and go on to complete a full A level, they will only achieve a qualif ...
... All external examinations will be at the end of the course; either AS level or the A level. The AS level and A level have been decoupled meaning that the AS level is a stand-alone qualification. If students sit the AS examinations and go on to complete a full A level, they will only achieve a qualif ...
X PS EM - deo kadapa
... Ans:- Photosynthesis is an endothermic reaction as it takes energy from sun. 3. Why should a magnesium ribbon cleaned before burning in air? Ans:- Magnesium ribbon should be cleaned before burning in air, because it forms magnesium oxide by reacting with oxygen present in air. This oxide layer shoul ...
... Ans:- Photosynthesis is an endothermic reaction as it takes energy from sun. 3. Why should a magnesium ribbon cleaned before burning in air? Ans:- Magnesium ribbon should be cleaned before burning in air, because it forms magnesium oxide by reacting with oxygen present in air. This oxide layer shoul ...
Chemistry I
... A chemical reaction is a process that leads to the transformation transformation of one set of chemical substances (reactants; reagents) to another (products). Chemical equations used to graphically illustrate chemical reactions: reactions: Reactant 1 (+ reactant 2) product 1 + (product 2) A chemica ...
... A chemical reaction is a process that leads to the transformation transformation of one set of chemical substances (reactants; reagents) to another (products). Chemical equations used to graphically illustrate chemical reactions: reactions: Reactant 1 (+ reactant 2) product 1 + (product 2) A chemica ...
Martin Quack
... briefly discuss the current status and the relation to the other two questions. The discovery of parity violation led to important developments of physics in the 20th century and is understood within the standard model of particle physics, SMPP. For molecular stereochemistry it leads to the surprisi ...
... briefly discuss the current status and the relation to the other two questions. The discovery of parity violation led to important developments of physics in the 20th century and is understood within the standard model of particle physics, SMPP. For molecular stereochemistry it leads to the surprisi ...
Wilhelm Ostwald, the Father of Physical Chemistry
... for a base B. We begin with equimolar solutions of A, A∗ and B. Upon adding 1 litre of A to 1 litre of B, a solution of AB is prepared. To 1 litre of this solution AB, if we add 1 litre of the acid A∗ , the resulting volume will differ from 2 litres by v∗ . This v∗ will reflect the amount of A displa ...
... for a base B. We begin with equimolar solutions of A, A∗ and B. Upon adding 1 litre of A to 1 litre of B, a solution of AB is prepared. To 1 litre of this solution AB, if we add 1 litre of the acid A∗ , the resulting volume will differ from 2 litres by v∗ . This v∗ will reflect the amount of A displa ...
Chemistry - Set as Home Page
... On heating, if a solid changes directly into vapours without changing into the liquid state, the phenomenon is called __________. Each orbital in an atom can be completely described by __________. In a molecule of alkene, __________ restricts the rotation of the group of atoms at either end of the m ...
... On heating, if a solid changes directly into vapours without changing into the liquid state, the phenomenon is called __________. Each orbital in an atom can be completely described by __________. In a molecule of alkene, __________ restricts the rotation of the group of atoms at either end of the m ...
UNIT NUM="1" ID="UN
... in the center of the field. Moreover, the electrons would be like two tiny gnats buzzing around the stadium. Atoms are mostly empty space. When two atoms approach each other during a chemical reaction, their nuclei do not come close enough to interact. Of the three kinds of subatomic particles we ha ...
... in the center of the field. Moreover, the electrons would be like two tiny gnats buzzing around the stadium. Atoms are mostly empty space. When two atoms approach each other during a chemical reaction, their nuclei do not come close enough to interact. Of the three kinds of subatomic particles we ha ...
AP Chem Stoichiometry Notes Table of Contents Atomic Masses
... Because there are four H atoms and two O atoms on each side of the equation, the equation is balanced. We can represent the balanced equation by these molecular models, which illustrate that the number of atoms of each kind is the same on both sides of the arrow. Writing and Balancing the Equation f ...
... Because there are four H atoms and two O atoms on each side of the equation, the equation is balanced. We can represent the balanced equation by these molecular models, which illustrate that the number of atoms of each kind is the same on both sides of the arrow. Writing and Balancing the Equation f ...
Chemical Equilibrium
... characteristic Keq. The concentration of each reactant and product in a chemical reaction at equilibrium is related; the concentrations cannot be random values, but they depend on each other. The numerator of the expression for Keq has the concentrations of every product (however many products there ...
... characteristic Keq. The concentration of each reactant and product in a chemical reaction at equilibrium is related; the concentrations cannot be random values, but they depend on each other. The numerator of the expression for Keq has the concentrations of every product (however many products there ...
Chapter 05 Notes
... pressure (as the majority of processes we study do) and the only work done is this pressure–volume work, we can account for heat flow during the process by measuring the enthalpy of the system. • Enthalpy is the internal energy plus the product of pressure and volume: H = E + PV © 2012 Pearson Educa ...
... pressure (as the majority of processes we study do) and the only work done is this pressure–volume work, we can account for heat flow during the process by measuring the enthalpy of the system. • Enthalpy is the internal energy plus the product of pressure and volume: H = E + PV © 2012 Pearson Educa ...
Chapter 5 Thermochemistry
... pressure (as the majority of processes we study do) and the only work done is this pressure–volume work, we can account for heat flow during the process by measuring the enthalpy of the system. • Enthalpy is the internal energy plus the product of pressure and volume: H = E + PV © 2012 Pearson Educa ...
... pressure (as the majority of processes we study do) and the only work done is this pressure–volume work, we can account for heat flow during the process by measuring the enthalpy of the system. • Enthalpy is the internal energy plus the product of pressure and volume: H = E + PV © 2012 Pearson Educa ...
chapter6 - HCC Learning Web
... the components of the hill (frictional heating) and to the increase in the potential energy of B. ...
... the components of the hill (frictional heating) and to the increase in the potential energy of B. ...
Organic - NUS Chemistry
... irreversible processes; various types of processes (isothermal, isobaric, isochoric, adiabatic). Thermochemistry - Enthalpy change of a reaction; the Law of Lavoisier and Laplace; the Hess' law; standard enthalpy of formation; standard enthalpy of combustion; group additivity method of determining e ...
... irreversible processes; various types of processes (isothermal, isobaric, isochoric, adiabatic). Thermochemistry - Enthalpy change of a reaction; the Law of Lavoisier and Laplace; the Hess' law; standard enthalpy of formation; standard enthalpy of combustion; group additivity method of determining e ...
1. Define the following term: system. A) The part of the universe that
... 20. Think about what is meant by a state function. Give two examples of quantities that are state functions and two that are not. A) State functions: P,V; Not: work, energy B) State functions: energy, P; Not: T, heat C) State functions: energy, V; Not: work, heat D) State functions: energy, work; No ...
... 20. Think about what is meant by a state function. Give two examples of quantities that are state functions and two that are not. A) State functions: P,V; Not: work, energy B) State functions: energy, P; Not: T, heat C) State functions: energy, V; Not: work, heat D) State functions: energy, work; No ...
35 - TAMU Chemistry
... (this is a filter used to neutralize any acids that may form during storage) TNT – trinitrotoluene (solid) C7H5N3O6 (s) → huge 3N2 + 7CO2 + 5H2O + 7C(s) entropy (15 moles of gas) increase ...
... (this is a filter used to neutralize any acids that may form during storage) TNT – trinitrotoluene (solid) C7H5N3O6 (s) → huge 3N2 + 7CO2 + 5H2O + 7C(s) entropy (15 moles of gas) increase ...
Chemical thermodynamics
Chemical thermodynamics is the study of the interrelation of heat and work with chemical reactions or with physical changes of state within the confines of the laws of thermodynamics. Chemical thermodynamics involves not only laboratory measurements of various thermodynamic properties, but also the application of mathematical methods to the study of chemical questions and the spontaneity of processes.The structure of chemical thermodynamics is based on the first two laws of thermodynamics. Starting from the first and second laws of thermodynamics, four equations called the ""fundamental equations of Gibbs"" can be derived. From these four, a multitude of equations, relating the thermodynamic properties of the thermodynamic system can be derived using relatively simple mathematics. This outlines the mathematical framework of chemical thermodynamics.