Unit F325 - Equilibria, energetics and elements - High band
... of the words ‘more’ and ‘less’ should not be used unless qualified for comparing negative numbers (–2 is actually ‘more’ than –4!). The candidate should have stated that the lattice enthalpy of MgO is less exothermic or less negative’. By using just ‘less’, this is a case is which ‘less means more’! ...
... of the words ‘more’ and ‘less’ should not be used unless qualified for comparing negative numbers (–2 is actually ‘more’ than –4!). The candidate should have stated that the lattice enthalpy of MgO is less exothermic or less negative’. By using just ‘less’, this is a case is which ‘less means more’! ...
____ 1. The energy required to convert a ground
... 16. The safest and most effective emergency procedure to treat an acid splash on skin is to do which of the following immediately? a. Dry the affected area with paper towels d. Flush the affected area with water and then with a dilute NaHCO3 solution b. Sprinkle the affected area with powdered e. Fl ...
... 16. The safest and most effective emergency procedure to treat an acid splash on skin is to do which of the following immediately? a. Dry the affected area with paper towels d. Flush the affected area with water and then with a dilute NaHCO3 solution b. Sprinkle the affected area with powdered e. Fl ...
BIOL 157 * BIOLOGICAL CHEMISTRY Lecture 6
... • For reactions that occur in two phases (gas/solid or liquid/solid), the ...
... • For reactions that occur in two phases (gas/solid or liquid/solid), the ...
Entropy (Part I)
... • Any process that occurs without outside intervention is spontaneous. • When an egg is dropped, it spontaneously breaks. • The reverse reaction is not spontaneous. (Humpty Dumpty couldnʼt be put back together again.) • A spontaneous process therefore occurs in only one direction. (At a given ...
... • Any process that occurs without outside intervention is spontaneous. • When an egg is dropped, it spontaneously breaks. • The reverse reaction is not spontaneous. (Humpty Dumpty couldnʼt be put back together again.) • A spontaneous process therefore occurs in only one direction. (At a given ...
Thermochemistry Energy and Its Units
... Energy There are three broad concepts of energy: Kinetic energy is the energy associated with an object by virtue of its motion. Potential energy is the energy an object has by virtue of its position in a field of force. Internal energy is the sum of the kinetic and potential energies of the partic ...
... Energy There are three broad concepts of energy: Kinetic energy is the energy associated with an object by virtue of its motion. Potential energy is the energy an object has by virtue of its position in a field of force. Internal energy is the sum of the kinetic and potential energies of the partic ...
Document
... The electric field inside a nonconducting, uniform sphere of radius R has magnitude E = qr/4πε0R3, where q is the total charge on the sphere and r is the distance from its center. (c) Given V(∞) = 0, show that V(r) = q(3R2 –r2)/8πε0R3 inside the sphere. Why does this answer differ from the answer in ...
... The electric field inside a nonconducting, uniform sphere of radius R has magnitude E = qr/4πε0R3, where q is the total charge on the sphere and r is the distance from its center. (c) Given V(∞) = 0, show that V(r) = q(3R2 –r2)/8πε0R3 inside the sphere. Why does this answer differ from the answer in ...
L3 potential
... The electric field inside a nonconducting, uniform sphere of radius R has magnitude E = qr/4πε0R3, where q is the total charge on the sphere and r is the distance from its center. (c) Given V(∞) = 0, show that V(r) = q(3R2 –r2)/8πε0R3 inside the sphere. Why does this answer differ from the answer in ...
... The electric field inside a nonconducting, uniform sphere of radius R has magnitude E = qr/4πε0R3, where q is the total charge on the sphere and r is the distance from its center. (c) Given V(∞) = 0, show that V(r) = q(3R2 –r2)/8πε0R3 inside the sphere. Why does this answer differ from the answer in ...
Optical basicity - Archives ouvertes HAL Artois
... other molecules (alcohols, etc.). If parameters describing the catalytic activity are numerous and fairly wellknown, selectivity is always related to kinetics, e.g., expressed as a ratio of the rates of one process compared to another one. Finding parameters able to account for selectivity in mild o ...
... other molecules (alcohols, etc.). If parameters describing the catalytic activity are numerous and fairly wellknown, selectivity is always related to kinetics, e.g., expressed as a ratio of the rates of one process compared to another one. Finding parameters able to account for selectivity in mild o ...
Final Exam - KFUPM Faculty List
... A) perpendicular (at a 90 degree angle) to each other B) at some angle larger than 0 and less than 90 degrees C) sharing the same space D) at some angle larger than 120 and less than 180 degrees E) coplanar (at a 0 degree angle) to each other In CO2 there are 2 CO σ-bonds, 2 CO π-bonds and 4 lone p ...
... A) perpendicular (at a 90 degree angle) to each other B) at some angle larger than 0 and less than 90 degrees C) sharing the same space D) at some angle larger than 120 and less than 180 degrees E) coplanar (at a 0 degree angle) to each other In CO2 there are 2 CO σ-bonds, 2 CO π-bonds and 4 lone p ...
s_block - ilc.edu.hk
... Formation of hydroxides 2. Group II hydroxides Ca(s) + 2H2O(l) Ca(OH)2(aq) + H2(g) Sr(s) + 2H2O(l) Sr(OH)2(aq) + H2(g) Ba(s) + 2H2O(l) Ba(OH)2(aq) + H2(g) Mg reacts with steam but not water. Mg(s) + H2O(g) MgO(s) + H2(g) Be does not react with water and steam. ...
... Formation of hydroxides 2. Group II hydroxides Ca(s) + 2H2O(l) Ca(OH)2(aq) + H2(g) Sr(s) + 2H2O(l) Sr(OH)2(aq) + H2(g) Ba(s) + 2H2O(l) Ba(OH)2(aq) + H2(g) Mg reacts with steam but not water. Mg(s) + H2O(g) MgO(s) + H2(g) Be does not react with water and steam. ...
Student Study Guide Chemistry 534
... measurement is reported in kilopascals (kPa). On pascal is defined to be the pressure exerted by a force of one newton acting on an area of one square metre. Using symbols, 1 Pa = 1 N/m2 and 1 kPa = 1000 Pa. Standard Atmospheric Pressure corresponds to the typical pressure found at sea level, which ...
... measurement is reported in kilopascals (kPa). On pascal is defined to be the pressure exerted by a force of one newton acting on an area of one square metre. Using symbols, 1 Pa = 1 N/m2 and 1 kPa = 1000 Pa. Standard Atmospheric Pressure corresponds to the typical pressure found at sea level, which ...
Chapter 4
... surrounded by water molecules arranged in a specific manner. Each Na1 ion is surrounded by a number of water molecules orienting their negative poles toward the cation. Similarly, each Cl2 ion is surrounded by water molecules with their positive poles oriented toward the anion (Figure 4.2). Hydratio ...
... surrounded by water molecules arranged in a specific manner. Each Na1 ion is surrounded by a number of water molecules orienting their negative poles toward the cation. Similarly, each Cl2 ion is surrounded by water molecules with their positive poles oriented toward the anion (Figure 4.2). Hydratio ...
Chapter 9
... in the production of many important chemicals, such as aspirin, and disinfectants. One industrial method of preparing chlorobenzene is to react benzene, C6H6, with chlorine, which is represented by the following equation. ...
... in the production of many important chemicals, such as aspirin, and disinfectants. One industrial method of preparing chlorobenzene is to react benzene, C6H6, with chlorine, which is represented by the following equation. ...
First Semester Final Review
... The intial pressure of W(g) is 1.20 atm and that of X(g) is 1.60 atm. No Y(g) or Z(g) is initially present. The experiment is carried out at constant temperature. What is the partial pressure of Z(g) when the partial pressure of W(g) has decreased to 1.0 atm? a. 0.20 atm b. 0.40 atm c. 1.0 atm d. 1. ...
... The intial pressure of W(g) is 1.20 atm and that of X(g) is 1.60 atm. No Y(g) or Z(g) is initially present. The experiment is carried out at constant temperature. What is the partial pressure of Z(g) when the partial pressure of W(g) has decreased to 1.0 atm? a. 0.20 atm b. 0.40 atm c. 1.0 atm d. 1. ...
Chemistry - Plymouth Public Schools
... Central Concepts: In a chemical reaction, one or more reactants are transformed into one or more new products. Chemical equations represent the reaction and must be balanced. The conservation of atoms in a chemical reaction leads to the ability to calculate the amount of products formed and reactant ...
... Central Concepts: In a chemical reaction, one or more reactants are transformed into one or more new products. Chemical equations represent the reaction and must be balanced. The conservation of atoms in a chemical reaction leads to the ability to calculate the amount of products formed and reactant ...
AP® Chemistry
... A 10-minute break should be provided after Section I is completed. Students should be given a 10-minute warning prior to the end of each of the Parts A and B in Section II of the exam. The actual AP Exam is administered in one session. Students will have the most realistic experience if a complete m ...
... A 10-minute break should be provided after Section I is completed. Students should be given a 10-minute warning prior to the end of each of the Parts A and B in Section II of the exam. The actual AP Exam is administered in one session. Students will have the most realistic experience if a complete m ...
AP® Chemistry
... A 10-minute break should be provided after Section I is completed. Students should be given a 10-minute warning prior to the end of each of the Parts A and B in Section II of the exam. The actual AP Exam is administered in one session. Students will have the most realistic experience if a complete m ...
... A 10-minute break should be provided after Section I is completed. Students should be given a 10-minute warning prior to the end of each of the Parts A and B in Section II of the exam. The actual AP Exam is administered in one session. Students will have the most realistic experience if a complete m ...
KEY + + - UIC Department of Chemistry
... H2 SO4 , and NaOH. A precipitate forms only with H2 SO4 . Which of the following cations ...
... H2 SO4 , and NaOH. A precipitate forms only with H2 SO4 . Which of the following cations ...
Electrochemistry
Electrochemistry is the branch of physical chemistry that studies chemical reactions which take place at the interface of an electrode, usually a solid metal or a semiconductor, and an ionic conductor, the electrolyte. These reactions involve electric charges moving between the electrodes and the electrolyte (or ionic species in a solution). Thus electrochemistry deals with the interaction between electrical energy and chemical change.When a chemical reaction is caused by an externally supplied current, as in electrolysis, or if an electric current is produced by a spontaneous chemical reaction as in a battery, it is called an electrochemical reaction. Chemical reactions where electrons are transferred directly between molecules and/or atoms are called oxidation-reduction or (redox) reactions. In general, electrochemistry describes the overall reactions when individual redox reactions are separate but connected by an external electric circuit and an intervening electrolyte.