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وزارة التربية و التعليم العالي امتحانات شهادة الثانوية الع
... represents the variation of the concentration of iodine versus time is drawn. Two tangents are drawn on this curve at two different points and then their corresponding slopes are calculated. The obtained values are : S 8 = 6.3 x 10-4 mol.L-1.min-1 at t = 8 min and S 20 = 2x10-4 mol.L-1. min-1 at t = ...
... represents the variation of the concentration of iodine versus time is drawn. Two tangents are drawn on this curve at two different points and then their corresponding slopes are calculated. The obtained values are : S 8 = 6.3 x 10-4 mol.L-1.min-1 at t = 8 min and S 20 = 2x10-4 mol.L-1. min-1 at t = ...
August 2007
... The ice finishes melting at 2 minutes and heat enters the container. The ice finishes melting at 2 minutes and heat leaves the container. The ice finishes melting at 5 minutes and heat enters the container. The ice finishes melting at 5 minutes and heat leaves the container. ...
... The ice finishes melting at 2 minutes and heat enters the container. The ice finishes melting at 2 minutes and heat leaves the container. The ice finishes melting at 5 minutes and heat enters the container. The ice finishes melting at 5 minutes and heat leaves the container. ...
Ionic Equations
... • Gravimetric Analysis – the amount of a species is determined from the mass of a product – Precipitation is often used • Volumetric Analysis (TITRATION) - the amount of a species is determined from the volume of solution needed for complete reaction – Most commonly and acid-base reaction (neutraliz ...
... • Gravimetric Analysis – the amount of a species is determined from the mass of a product – Precipitation is often used • Volumetric Analysis (TITRATION) - the amount of a species is determined from the volume of solution needed for complete reaction – Most commonly and acid-base reaction (neutraliz ...
GC-Final-Review-2014
... CH4 C2H6 CO2 N2O4 CO2 Write the empirical formula for any of the above compounds that are molecular formulas. Determine the molecular formula of a compound with an empirical formula of CH that has a molar mass of 78.11 g/mol. A compound contains 36.48% Na, 25.41% S and 38.11% O. Find its empirical f ...
... CH4 C2H6 CO2 N2O4 CO2 Write the empirical formula for any of the above compounds that are molecular formulas. Determine the molecular formula of a compound with an empirical formula of CH that has a molar mass of 78.11 g/mol. A compound contains 36.48% Na, 25.41% S and 38.11% O. Find its empirical f ...
Full answers
... necessary for coagulation to occur. Addition of an electrolyte: neutralises the surface charges, thus removing the electrostatic repulsion between colloidal particles. Changing the pH: can flatten / desorb electrosteric stabilisers • A saturated solution of lithium carbonate in pure water at 20 °C c ...
... necessary for coagulation to occur. Addition of an electrolyte: neutralises the surface charges, thus removing the electrostatic repulsion between colloidal particles. Changing the pH: can flatten / desorb electrosteric stabilisers • A saturated solution of lithium carbonate in pure water at 20 °C c ...
CHEMICAL REACTIONS
... ________ 13. The reaction in question 12 is an example of a: a. combination reaction. c. single-replacement reaction. b. decomposition reaction. d. double-replacement reaction. ________ 14. When the equation Fe(s) O2(g) y Fe2O3(s) is balanced, what is the coefficient for Fe2O3? a. 1 c. 3 b. 2 d. 4 ...
... ________ 13. The reaction in question 12 is an example of a: a. combination reaction. c. single-replacement reaction. b. decomposition reaction. d. double-replacement reaction. ________ 14. When the equation Fe(s) O2(g) y Fe2O3(s) is balanced, what is the coefficient for Fe2O3? a. 1 c. 3 b. 2 d. 4 ...
Chemical Reactions
... is no way to balance O with a whole number, double all the coefficients and try again. (Because O is diatomic as an element) – (Shortcut) Polyatomic ions that appear on both sides of the equation should be balanced as independent units ...
... is no way to balance O with a whole number, double all the coefficients and try again. (Because O is diatomic as an element) – (Shortcut) Polyatomic ions that appear on both sides of the equation should be balanced as independent units ...
Physical Science Chapter 7 Chemical Reactions Section 7.1
... 3. In the reaction shown below, how many grams of hydrogen are produced when 10 moles of potassium react with water? 2K + 2H2O —› 2KOH + H2 a. 2.5 g b. 5 g c. 10 g d. 20 g ANS: ___________ 1. In the chemical equation below, the reactants are carbon dioxide and water. CH4 + 2O2 —› CO2 +2H2O ...
... 3. In the reaction shown below, how many grams of hydrogen are produced when 10 moles of potassium react with water? 2K + 2H2O —› 2KOH + H2 a. 2.5 g b. 5 g c. 10 g d. 20 g ANS: ___________ 1. In the chemical equation below, the reactants are carbon dioxide and water. CH4 + 2O2 —› CO2 +2H2O ...
students` errors in solving numerical chemical
... We present below the errors, together with percentages of students who demonstrated the errors, in answering the set questions and problems. Note that the remaining percentage refers to students who have not made the errors. In our presentation, we make an attempt to distinguish between ‘random’ err ...
... We present below the errors, together with percentages of students who demonstrated the errors, in answering the set questions and problems. Note that the remaining percentage refers to students who have not made the errors. In our presentation, we make an attempt to distinguish between ‘random’ err ...
Week 3 - Help-A-Bull
... of atoms/molecules; • Explains the pressure of gases … heat capacity of metals … average speed of electrons in semiconductors etc. • Assumes that atoms/molecules of gases, liquids, solids are in constant motion when above absolute zero temperature ...
... of atoms/molecules; • Explains the pressure of gases … heat capacity of metals … average speed of electrons in semiconductors etc. • Assumes that atoms/molecules of gases, liquids, solids are in constant motion when above absolute zero temperature ...
AP CHEMISTRY COURSE SYLLABUS
... chemical systems: net ionic equations 2. Balancing of equations including those for redox reactions 3. Mass and volume relations with emphasis on the mole concept, including empirical formulas and limiting reactants ...
... chemical systems: net ionic equations 2. Balancing of equations including those for redox reactions 3. Mass and volume relations with emphasis on the mole concept, including empirical formulas and limiting reactants ...
Document
... Write the equation for this reaction. o) Given the reaction equation you have written above, can you draw any conclusions about which way the reaction will progress (e.g., towards the right, or to products, or to the left, or reactants)? ...
... Write the equation for this reaction. o) Given the reaction equation you have written above, can you draw any conclusions about which way the reaction will progress (e.g., towards the right, or to products, or to the left, or reactants)? ...
Chemical Thermodynamics Survival Kit
... opposed to the reversible path we have constructed between the initial and final states). The negative sign in front of qact is inserted only to comply with our convention of considering a positive value of qact as heat absorbed by the system during the actual process (which, amazingly enough, is ir ...
... opposed to the reversible path we have constructed between the initial and final states). The negative sign in front of qact is inserted only to comply with our convention of considering a positive value of qact as heat absorbed by the system during the actual process (which, amazingly enough, is ir ...
GCE Chemistry Question Paper Unit 04 - Kinetics, Equilibria
... l Fill in the boxes at the top of this page. l Answer all questions. l You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. l All working must be shown. l Do all rough work in this book. Cross through any work you do not want to be ma ...
... l Fill in the boxes at the top of this page. l Answer all questions. l You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. l All working must be shown. l Do all rough work in this book. Cross through any work you do not want to be ma ...
Smith Reaction- HW PSI Chemistry
... 52) Which of the following is the correctly balanced equation for the incomplete combustion of heptene, C7H14? A) C7H14+ 14O 7CO + 7H2O B) C7H14 + 7O2 7CO + 7H2O C) 2C7H14 + 21O2 14CO2 + 14H2O D) C7H14 + O2 C7O2 + 7H2 E) C7H14 + 7O2 7CO2 + 7H2O 53) The type of reaction that takes place wh ...
... 52) Which of the following is the correctly balanced equation for the incomplete combustion of heptene, C7H14? A) C7H14+ 14O 7CO + 7H2O B) C7H14 + 7O2 7CO + 7H2O C) 2C7H14 + 21O2 14CO2 + 14H2O D) C7H14 + O2 C7O2 + 7H2 E) C7H14 + 7O2 7CO2 + 7H2O 53) The type of reaction that takes place wh ...
6. Thermodynamics - Sakshi Education
... a state function and is an extensive property. Ex: Ice ⇌ Water ⇌ Vapour .The order of entropy is S(g) > S(l) > S(s) Entropy increases in all spontaneous processes 6. State second law of Thermodynamics. What do you understand by it? Ans. Second law of thermodynamics states that Heat cannot flow form ...
... a state function and is an extensive property. Ex: Ice ⇌ Water ⇌ Vapour .The order of entropy is S(g) > S(l) > S(s) Entropy increases in all spontaneous processes 6. State second law of Thermodynamics. What do you understand by it? Ans. Second law of thermodynamics states that Heat cannot flow form ...
Chapter 12 - "Chemical Formulas and Equations"
... pressure. The height of each tank varies with the amount of gas inside, so more gas means a greater volume rather than a greater pressure. A rigid gas tank with a constant volume would be under very high pressure when full and very low pressure when nearly empty, which would make it difficult to pum ...
... pressure. The height of each tank varies with the amount of gas inside, so more gas means a greater volume rather than a greater pressure. A rigid gas tank with a constant volume would be under very high pressure when full and very low pressure when nearly empty, which would make it difficult to pum ...
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.