chemistry intermediate may 2010 marking scheme
... On increasing pressure, the equilibrium will shift backwards to produce less products: (1.5) by LeChatelier’s principle, the shift will be in the direction that tends to counter the change: converting 3 mol product into 2 mol reactant will bring about a reduction in pressure. (1.5) (3 marks) Sectio ...
... On increasing pressure, the equilibrium will shift backwards to produce less products: (1.5) by LeChatelier’s principle, the shift will be in the direction that tends to counter the change: converting 3 mol product into 2 mol reactant will bring about a reduction in pressure. (1.5) (3 marks) Sectio ...
Experiment 15: Reduction and Oxidation of Organic Compounds
... name given to modifications implemented in chemical manufacturing processes that ensure a safer and cleaner environment (see Chapter 2 in LTOC). Camphor is a natural product that can be obtained by the steam distillation of pulverized camphor trees. It has been used in the pharmaceutical industry in ...
... name given to modifications implemented in chemical manufacturing processes that ensure a safer and cleaner environment (see Chapter 2 in LTOC). Camphor is a natural product that can be obtained by the steam distillation of pulverized camphor trees. It has been used in the pharmaceutical industry in ...
Chem 2A Final Review
... Limiting Reagents Theoretical and Percent Yield 64. The answer that is closest to the number of grams of oxygen in 6.022 1023 molecules of O2 is: ...
... Limiting Reagents Theoretical and Percent Yield 64. The answer that is closest to the number of grams of oxygen in 6.022 1023 molecules of O2 is: ...
Gas Laws
... 1. Ideal combustion, resulting in only carbon dioxide and water, rarely happens. In general, at the very least, some carbon monoxide is also produced. The real combustion of methane is more closely represented, then, by the unbalanced equation CH4 + O2 H2O + CO2 + CO. If 0.100 mol CH4 is allowed t ...
... 1. Ideal combustion, resulting in only carbon dioxide and water, rarely happens. In general, at the very least, some carbon monoxide is also produced. The real combustion of methane is more closely represented, then, by the unbalanced equation CH4 + O2 H2O + CO2 + CO. If 0.100 mol CH4 is allowed t ...
CHEMICAL REACTIONS Chapter 4
... 4 Al atoms + 3 O2 molecules ------> 2 formula units of Al2O3 4 moles of Al + 3 moles of O2 ----> 2 moles of Al2O3 ...
... 4 Al atoms + 3 O2 molecules ------> 2 formula units of Al2O3 4 moles of Al + 3 moles of O2 ----> 2 moles of Al2O3 ...
Worksheet
... __ Cr2O72¯ + __ e¯ + __ H+ __ Cr3+ + __ H2O(l) When the equation for the half reaction above is balanced with the lowest whole-number coefficients, the coefficient for H2O is: (A) 2 (B) 4 (C) 6 (D) 7 (E) 14 15. How many grams of calcium nitrate, Ca(NO3)2, contains 24 grams of oxygen atoms? (A) 164 ...
... __ Cr2O72¯ + __ e¯ + __ H+ __ Cr3+ + __ H2O(l) When the equation for the half reaction above is balanced with the lowest whole-number coefficients, the coefficient for H2O is: (A) 2 (B) 4 (C) 6 (D) 7 (E) 14 15. How many grams of calcium nitrate, Ca(NO3)2, contains 24 grams of oxygen atoms? (A) 164 ...
Honors Chemistry I
... A balanced chemical equation correctly shows the law of conservation of mass in action! o You will use coefficients to balance chemical reactions. Coefficients are placed in front of the atom/molecule/compound present in a chemical equation. Never change the subscripts involved in a chemical equatio ...
... A balanced chemical equation correctly shows the law of conservation of mass in action! o You will use coefficients to balance chemical reactions. Coefficients are placed in front of the atom/molecule/compound present in a chemical equation. Never change the subscripts involved in a chemical equatio ...
Gas Laws
... 1. Ideal combustion, resulting in only carbon dioxide and water, rarely happens. In general, at the very least, some carbon monoxide is also produced. The real combustion of methane is more closely represented, then, by the unbalanced equation CH4 + O2 H2O + CO2 + CO. If 0.100 mol CH4 is allowed t ...
... 1. Ideal combustion, resulting in only carbon dioxide and water, rarely happens. In general, at the very least, some carbon monoxide is also produced. The real combustion of methane is more closely represented, then, by the unbalanced equation CH4 + O2 H2O + CO2 + CO. If 0.100 mol CH4 is allowed t ...
IGCSE SoW 2013
... Describe and explain the main reactions involved in the extraction of iron from iron ore (haematite), using coke, limestone and air in a blast furnace ...
... Describe and explain the main reactions involved in the extraction of iron from iron ore (haematite), using coke, limestone and air in a blast furnace ...
Calculations Booklet
... 80cm3 of 0.5 moll-1 sodium hydroxide solution, NaOH, and 80cm3 of 0.5 moll-1 hydrochloric acid,HCl, were mixed and a temperature rise of 3.4oC was recorded. Calculate the enthalpy of neutralisation. 25cm3 of 1 moll-1 H2SO4 is neutralised by 50cm3 of 1 moll-1 KOH. A temperature rise of 9.1oC is noted ...
... 80cm3 of 0.5 moll-1 sodium hydroxide solution, NaOH, and 80cm3 of 0.5 moll-1 hydrochloric acid,HCl, were mixed and a temperature rise of 3.4oC was recorded. Calculate the enthalpy of neutralisation. 25cm3 of 1 moll-1 H2SO4 is neutralised by 50cm3 of 1 moll-1 KOH. A temperature rise of 9.1oC is noted ...
Revised Higher 2014 Paper
... naturally occurring ester found in the essential oil extracted from the leaves of strawberry gum trees. To extract the essential oil, steam is passed through shredded strawberry gum leaves. The steam and essential oil are then condensed and collected. (i) Complete the diagram to show an apparatus ...
... naturally occurring ester found in the essential oil extracted from the leaves of strawberry gum trees. To extract the essential oil, steam is passed through shredded strawberry gum leaves. The steam and essential oil are then condensed and collected. (i) Complete the diagram to show an apparatus ...
Chemistry II Exams and Keys 2013 Season
... valve separating the two vessels is opened and both cooled to a temperature of 17°C. What is the final pressure in the vessel? A. 6.8 atm ...
... valve separating the two vessels is opened and both cooled to a temperature of 17°C. What is the final pressure in the vessel? A. 6.8 atm ...
08_Lecture - HCC Learning Web
... • For example, nickel(II) hydrogen carbonate decomposes as follows: Ni(HCO3)2(s) → NiCO3(s) + H2O(l) + CO2(g) ...
... • For example, nickel(II) hydrogen carbonate decomposes as follows: Ni(HCO3)2(s) → NiCO3(s) + H2O(l) + CO2(g) ...
Heat transfer mechanisms of laminar flames of hydrogen+ oxygen
... oxy-fuel flames to glass products for lamp manufacturing. In this study a hydrogen–oxygen flame was used as an impinging jet in a stagnation-flow-like configuration. The goal of this study was to analyze the crucial heat transfer phenomena to formulate new design rules for the optimization of the he ...
... oxy-fuel flames to glass products for lamp manufacturing. In this study a hydrogen–oxygen flame was used as an impinging jet in a stagnation-flow-like configuration. The goal of this study was to analyze the crucial heat transfer phenomena to formulate new design rules for the optimization of the he ...
Chem 115 POGIL Worksheet
... Knowing how much heat is gained or lost in a chemical or physical process is important in many real-life applications, such as determining the caloric content of food, the heat potential of a fuel, and the heat required or liberated to produce a useful material. The heat associated with a process is ...
... Knowing how much heat is gained or lost in a chemical or physical process is important in many real-life applications, such as determining the caloric content of food, the heat potential of a fuel, and the heat required or liberated to produce a useful material. The heat associated with a process is ...
Lecture 7. Fundamentals of atmospheric chemistry: Part 2 1
... These terms are sometimes confusing since the reduction process involves adding an electron. Keep in mind it's the charge that's being reduced in this case. Oxidation receives its name because almost all reactions with oxygen involve some other element losing electrons to the oxygen. Only fluorine w ...
... These terms are sometimes confusing since the reduction process involves adding an electron. Keep in mind it's the charge that's being reduced in this case. Oxidation receives its name because almost all reactions with oxygen involve some other element losing electrons to the oxygen. Only fluorine w ...
Print out Reviews # 1 through # 17
... EOC REVIEW #13 1. Given the reaction at equilibrium: 2 N2 (g) + O2 (g) 2 N2O (g) (A) What is the equilibrium constant expression (Keq)? (B) What is the value of Keq if [N2] = 5.22 M, [O2] = 2.91 M, and [N2O] = 3.75 M? Use the information given below to answer questions 2 - 4. Given the reaction a ...
... EOC REVIEW #13 1. Given the reaction at equilibrium: 2 N2 (g) + O2 (g) 2 N2O (g) (A) What is the equilibrium constant expression (Keq)? (B) What is the value of Keq if [N2] = 5.22 M, [O2] = 2.91 M, and [N2O] = 3.75 M? Use the information given below to answer questions 2 - 4. Given the reaction a ...
Water splitting
Water splitting is the general term for a chemical reaction in which water is separated into oxygen and hydrogen. Efficient and economical water splitting would be a key technology component of a hydrogen economy. Various techniques for water splitting have been issued in water splitting patents in the United States. In photosynthesis, water splitting donates electrons to power the electron transport chain in photosystem II.