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kcse chemistry questions
... What is the purpose of hot compressed air in this process? (1mk) Study the diagram below and answer the questions that follow. ...
... What is the purpose of hot compressed air in this process? (1mk) Study the diagram below and answer the questions that follow. ...
8 Chemical Equations Chapter Outline Chemical Equations
... Chemists use chemical equations to: a. Summarize a chemical reaction by displaying the substances reacting and forming. b. Indicate specific amounts of materials consumed or produced during the reaction. ...
... Chemists use chemical equations to: a. Summarize a chemical reaction by displaying the substances reacting and forming. b. Indicate specific amounts of materials consumed or produced during the reaction. ...
1 - Weebly
... o (c) Will the atom economy be smaller, the same, or greater, if the reduction involves carbon monoxide (CO) rather than carbon (C)? explain? o The atom economy will be smaller because CO is a bigger molecular/reactant mass than C and 4 molecules would be needed per 'molecule' of Fe3O4, so the mass ...
... o (c) Will the atom economy be smaller, the same, or greater, if the reduction involves carbon monoxide (CO) rather than carbon (C)? explain? o The atom economy will be smaller because CO is a bigger molecular/reactant mass than C and 4 molecules would be needed per 'molecule' of Fe3O4, so the mass ...
File - Garbally Chemistry
... you get one carbon dioxide molecule for every carbon atom in the original and one water molecule for every two hydrogen atoms When you have done this, go back and balance the oxygen. ...
... you get one carbon dioxide molecule for every carbon atom in the original and one water molecule for every two hydrogen atoms When you have done this, go back and balance the oxygen. ...
Determination of Cystein and Methionine by Oscillating Chemical
... as the ability to perform large series of analyses, working conditions were optimized considering three factors, namely: (i) accomplishing the maximum oscillation amplitude to ensure higher sensitivity for determination of L-cysteine and methionine; (ii) obtaining oscillation period to allow the eff ...
... as the ability to perform large series of analyses, working conditions were optimized considering three factors, namely: (i) accomplishing the maximum oscillation amplitude to ensure higher sensitivity for determination of L-cysteine and methionine; (ii) obtaining oscillation period to allow the eff ...
CHEM 1411 – STUDY-GUIDE-for-TEST-2
... 56. During volcanic eruptions, hydrogen sulfide gas is given off and oxidized by air according to the following chemical equation: 2H2S(g) + 3O2(g) 2SO2(g) + 2H2O(g) Calculate the standard enthalpy change for the above reaction given: 3S(s) + 2H2O(g) 2H2S(g) + SO2(g) H° = 146.9 kJ/mol S(s) + O2 ...
... 56. During volcanic eruptions, hydrogen sulfide gas is given off and oxidized by air according to the following chemical equation: 2H2S(g) + 3O2(g) 2SO2(g) + 2H2O(g) Calculate the standard enthalpy change for the above reaction given: 3S(s) + 2H2O(g) 2H2S(g) + SO2(g) H° = 146.9 kJ/mol S(s) + O2 ...
Chapter 4 Aqueous Reactions and Solution Stoichiometry
... separate ions. As the (aq) designations remind us, CaCl2 , Na2CO3, and NaCl are all dissolved in the solution. Furthermore, they are all strong electrolytes. CaCO3 is an ionic compound, but it is not soluble. We do not write the formula of any insoluble compound as its component ions. Thus, the comp ...
... separate ions. As the (aq) designations remind us, CaCl2 , Na2CO3, and NaCl are all dissolved in the solution. Furthermore, they are all strong electrolytes. CaCO3 is an ionic compound, but it is not soluble. We do not write the formula of any insoluble compound as its component ions. Thus, the comp ...
Chapter 10
... 10.2 Introduction to Thermodynamics States and State Functions The First Law of Thermodynamics Work and Heat ...
... 10.2 Introduction to Thermodynamics States and State Functions The First Law of Thermodynamics Work and Heat ...
Worksheet Key
... g) H2 (g) + Cl2 (g) 2 HCl (g): volume is doubled. No change; changing volume or pressure will not affect this system; same # moles on both sides. h) Using the same system as above, some neon is added to the system. No change; neon is an inert gas; it won’t react with or affect the system. ...
... g) H2 (g) + Cl2 (g) 2 HCl (g): volume is doubled. No change; changing volume or pressure will not affect this system; same # moles on both sides. h) Using the same system as above, some neon is added to the system. No change; neon is an inert gas; it won’t react with or affect the system. ...
SAMPLE QUESTION PAPER SIR.S.M.TAHIR CHEMISTRY Mob: 9557076999
... Miss Rita was asked to synthesized alcohol by acidic hydration of 1-butene. She was unaware of the fact that the vessel she used had some coating of a metal and in addition to alcohol (b.p. 373 K), compound X (b.p. 353 K) was also isolated. X form bisulphate compound as well as 2, 4-dinitrophenyl hy ...
... Miss Rita was asked to synthesized alcohol by acidic hydration of 1-butene. She was unaware of the fact that the vessel she used had some coating of a metal and in addition to alcohol (b.p. 373 K), compound X (b.p. 353 K) was also isolated. X form bisulphate compound as well as 2, 4-dinitrophenyl hy ...
ExamView - 2002 AP Chemistry Exam.tst
... Directions: Each set of lettered choices below refers to the numbered questions or statements immediately following it. Select the one lettered choice that best answers each question or best fits each statement and then fill in the corresponding oval on the answer sheet. A choice may be used once, m ...
... Directions: Each set of lettered choices below refers to the numbered questions or statements immediately following it. Select the one lettered choice that best answers each question or best fits each statement and then fill in the corresponding oval on the answer sheet. A choice may be used once, m ...
TOPIC 11 Further equilibrium 11.1 Chemical equilibrium
... Make sure the equivalence point is at a pH greater than 7, since this is a titration of a weak acid and a strong base. Make sure the finishing pH is realistic for the concentration of base taken. The curve would start at a higher pH. The volume of sodium hydroxide at the equivalence point would be 1 ...
... Make sure the equivalence point is at a pH greater than 7, since this is a titration of a weak acid and a strong base. Make sure the finishing pH is realistic for the concentration of base taken. The curve would start at a higher pH. The volume of sodium hydroxide at the equivalence point would be 1 ...
Kjeldahl Method for Determination of Nitrogen
... within the cake. These can react violently when concentrated base is added in the distillation process. A certain amount of salting out can be managed by diluting the digest with water while it is still somewhat warm, but not too hot. Several catalysts have been employed by Kjeldahl chemists over th ...
... within the cake. These can react violently when concentrated base is added in the distillation process. A certain amount of salting out can be managed by diluting the digest with water while it is still somewhat warm, but not too hot. Several catalysts have been employed by Kjeldahl chemists over th ...
File
... Equations must be balanced – have same number of each kind of atom in reactants and products, since atoms are not created or destroyed in chemical reactions (law of conservation of mass) 2 Na + 2 H2O 2NaOH + H2, balanced 2, 2, 2, (1) are stoichiometric coefficients - coefficients are relative numb ...
... Equations must be balanced – have same number of each kind of atom in reactants and products, since atoms are not created or destroyed in chemical reactions (law of conservation of mass) 2 Na + 2 H2O 2NaOH + H2, balanced 2, 2, 2, (1) are stoichiometric coefficients - coefficients are relative numb ...
Chemical Bonding
... a substance that you have classified as ionic, as it is an electrolyte. Like some other ionic compounds that you are familiar with, for example, baking soda (sodium hydrogen carbonate) and chalk (calcium carbonate), it is also brittle and has a high melting temperature. How do we explain the formati ...
... a substance that you have classified as ionic, as it is an electrolyte. Like some other ionic compounds that you are familiar with, for example, baking soda (sodium hydrogen carbonate) and chalk (calcium carbonate), it is also brittle and has a high melting temperature. How do we explain the formati ...
2015 International Practice Exam: Chemistry
... never discuss these specific multiple-choice questions at any time in any form with anyone, including your teacher and other students. If you disclose these questions through any means, your AP Exam score will be canceled. . . . You must complete the answer sheet using a No. 2 pencil only. Mark all ...
... never discuss these specific multiple-choice questions at any time in any form with anyone, including your teacher and other students. If you disclose these questions through any means, your AP Exam score will be canceled. . . . You must complete the answer sheet using a No. 2 pencil only. Mark all ...
Thermodynamics - Shailendra Kumar Chemistry
... For a particular chemical reaction, ∆H° = +60.0 kJ and ∆S° = +121 J/K. At what temperature (in K) would this reaction become spontaneous? ...
... For a particular chemical reaction, ∆H° = +60.0 kJ and ∆S° = +121 J/K. At what temperature (in K) would this reaction become spontaneous? ...
Chapter 17: Reaction Energy and Reaction Kinetics
... If a large amount of energy is released when a compound is formed, the compound has a high negative heat of formation. Such compounds are very stable. Once they start, the reactions forming them usually proceed vigorously and without outside assistance. Elements in their standard states are defined ...
... If a large amount of energy is released when a compound is formed, the compound has a high negative heat of formation. Such compounds are very stable. Once they start, the reactions forming them usually proceed vigorously and without outside assistance. Elements in their standard states are defined ...
Molecular-level mechanisms of quartz dissolution under neutral and
... promoted largely by the H+ ion, the dissolution of quartz is decreased slightly upon adding H+ ions until a very acidic condition is attained (i.e., pH = 2) (Dove and Elston, 1992; Nangia and Garrison, 2008, 2009). A thin amorphous layer has been found on the surfaces of many silicate minerals that ...
... promoted largely by the H+ ion, the dissolution of quartz is decreased slightly upon adding H+ ions until a very acidic condition is attained (i.e., pH = 2) (Dove and Elston, 1992; Nangia and Garrison, 2008, 2009). A thin amorphous layer has been found on the surfaces of many silicate minerals that ...
CHAPTER 1
... any substance that has a definite composition. For example, consider the material called sucrose, or cane sugar. It has a definite composition in terms of the atoms that compose it. It is produced by certain plants in the chemical process of photosynthesis. Sucrose is a chemical. Carbon dioxide, wat ...
... any substance that has a definite composition. For example, consider the material called sucrose, or cane sugar. It has a definite composition in terms of the atoms that compose it. It is produced by certain plants in the chemical process of photosynthesis. Sucrose is a chemical. Carbon dioxide, wat ...
The Chemistry of Solutions Page | 1 Unit 7: The Chemistry of
... 1. A chemist dissolved 25.0 grams of sodium carbonate to make a 125.9mL aqueous solution in Beaker A, and 25.0 grams of copper (II) chloride in 125.9 mL of water in Beaker B and then combines the two solutions in Beaker C. (a) Write a balanced chemical reaction for the reaction that takes place in B ...
... 1. A chemist dissolved 25.0 grams of sodium carbonate to make a 125.9mL aqueous solution in Beaker A, and 25.0 grams of copper (II) chloride in 125.9 mL of water in Beaker B and then combines the two solutions in Beaker C. (a) Write a balanced chemical reaction for the reaction that takes place in B ...
2E HARRY B. GRAY GEORGE S. HAMMONP.
... knowledge has stimulated reformulation of working principles in the science. Undergraduate curricula and individual courses are in constant flux. Nowhere is the change and challenge greater than in freshman chemistry. Teachers of freshmen must meet the intellectual needs of students who have had mor ...
... knowledge has stimulated reformulation of working principles in the science. Undergraduate curricula and individual courses are in constant flux. Nowhere is the change and challenge greater than in freshman chemistry. Teachers of freshmen must meet the intellectual needs of students who have had mor ...
Electrolysis of water
Electrolysis of water is the decomposition of water (H2O) into oxygen (O2) and hydrogen gas (H2) due to an electric current being passed through the water.This technique can be used to make hydrogen fuel (hydrogen gas) and breathable oxygen; though currently most industrial methods make hydrogen fuel from natural gas instead.