Leaching of Sphalerite with Hydrogen Peroxide and Nitric Acid
... method of Levespiel [12]. From the analysis equation (10) gave straight lines, which could be concluded that the leaching process is chemical control. The rate constant, k of the reaction were determined and plotted against 1/T shown figure 6. The slope of this plot was used to determine the apparen ...
... method of Levespiel [12]. From the analysis equation (10) gave straight lines, which could be concluded that the leaching process is chemical control. The rate constant, k of the reaction were determined and plotted against 1/T shown figure 6. The slope of this plot was used to determine the apparen ...
- sartep.com
... 73. ________________A yellow precipitate forms when 0.5 M NaI(aq) is added to a 0.5 M solution of which of the following ions? (A) Pb2+(aq) (B) K+(aq) (C) CrO42- (aq) (D) SO42- (aq) (E) OH- (aq) 74. ________________. . . Li3N(s) + . . . H2O(l) . . . Li+ (aq) + . . . OH-(aq) + . . . NH3(g) When the ...
... 73. ________________A yellow precipitate forms when 0.5 M NaI(aq) is added to a 0.5 M solution of which of the following ions? (A) Pb2+(aq) (B) K+(aq) (C) CrO42- (aq) (D) SO42- (aq) (E) OH- (aq) 74. ________________. . . Li3N(s) + . . . H2O(l) . . . Li+ (aq) + . . . OH-(aq) + . . . NH3(g) When the ...
Problem 1: “A brief history” of life in the universe
... more readily than nitrogen molecules even though the escape velocity is independent of the mass of the escaping object. The chemical composition of the atmosphere of a planet depends on the temperature of the planet’s atmosphere (which in turn depends on the distance from the sun, internal temperatu ...
... more readily than nitrogen molecules even though the escape velocity is independent of the mass of the escaping object. The chemical composition of the atmosphere of a planet depends on the temperature of the planet’s atmosphere (which in turn depends on the distance from the sun, internal temperatu ...
Thermodynamic Investigation of the AINC and AICN Isomers by
... n 1 , 2069; n 2 , 549; n 3 , 100 ~2!, by Gerasimov et al.8 for AlNC, and those by Fukushima:5 n 1 , 1975.5; n 2 , 523.5; n 3 , 132.9 ~2!, for AlCN. The intermolecular distances, in Å, of AlNC, r Al-N51.849 and r N-C51.171, obtained from a millimeter-wave spectrum, were taken from Robinson et al.6 Fo ...
... n 1 , 2069; n 2 , 549; n 3 , 100 ~2!, by Gerasimov et al.8 for AlNC, and those by Fukushima:5 n 1 , 1975.5; n 2 , 523.5; n 3 , 132.9 ~2!, for AlCN. The intermolecular distances, in Å, of AlNC, r Al-N51.849 and r N-C51.171, obtained from a millimeter-wave spectrum, were taken from Robinson et al.6 Fo ...
Answers to NHSCE 2002 Part A Page 1
... In both cases the solutions are strongly alkaline, with the presence of hydrogen peroxide making very little difference to the pH. Last year we said that nitrogen hydride (a.k.a. ammonia, NH3) gives an alkaline solution. This is because it reacts as a Bronsted-Lowry base with water. Other non-metal ...
... In both cases the solutions are strongly alkaline, with the presence of hydrogen peroxide making very little difference to the pH. Last year we said that nitrogen hydride (a.k.a. ammonia, NH3) gives an alkaline solution. This is because it reacts as a Bronsted-Lowry base with water. Other non-metal ...
1 [Turn Over Section A For each question there are four possible
... When iron filings are added to nitric acid, a yellow solution and nitrogen dioxide gas are formed. On the addition of ammonium thiocyanate to the resultant solution, a bloodred colouration due to an iron (III) complex is formed. Which statements are correct? ...
... When iron filings are added to nitric acid, a yellow solution and nitrogen dioxide gas are formed. On the addition of ammonium thiocyanate to the resultant solution, a bloodred colouration due to an iron (III) complex is formed. Which statements are correct? ...
Chemistry - Birkenhead School
... where appropriate, to place these metals in order of reactivity explain how the reactivity of metals with water or dilute acids is related to the tendency of the metal to form its positive ion deduce an order of reactivity of metals based on experimental results The reactions of metals with wate ...
... where appropriate, to place these metals in order of reactivity explain how the reactivity of metals with water or dilute acids is related to the tendency of the metal to form its positive ion deduce an order of reactivity of metals based on experimental results The reactions of metals with wate ...
File - Fidaa`s Level 2 Portfolio
... 1. What evidence do you have that an ester was produced in each of your reactions? An ester was produced in each reaction because after all of the carboxylic acids were added to the alcohols; some bonds are broken and create two new bonds. One bond of water and one bond of a new chemical including ...
... 1. What evidence do you have that an ester was produced in each of your reactions? An ester was produced in each reaction because after all of the carboxylic acids were added to the alcohols; some bonds are broken and create two new bonds. One bond of water and one bond of a new chemical including ...
First Semester Final Review
... 27. Of the following molecules, which has the largest dipole moment? a. CO b. CO2 c. O2 d. HF e. F2 28. ___Li3N (s) + ___H2O (l) ___Li+ (aq) + ___OH- (aq) + ___NH3 (g) When the equation above is balanced and all coefficients reduced to lowest whole number terms, the coefficient for OH- (aq) is a. ...
... 27. Of the following molecules, which has the largest dipole moment? a. CO b. CO2 c. O2 d. HF e. F2 28. ___Li3N (s) + ___H2O (l) ___Li+ (aq) + ___OH- (aq) + ___NH3 (g) When the equation above is balanced and all coefficients reduced to lowest whole number terms, the coefficient for OH- (aq) is a. ...
Boronic acids facilitate rapid oxime condensations at neutral pH
... the range of 4.5–5, is consistent with normal oxime formation35 except there is a distortion in the sigmoidal shape at higher pH (i.e. 7.2 & 8). The asymmetry in the pH dependence curve is inverted in comparison to a typical oxime condensation (acetone with hydroxylamine),35 which shows a more prono ...
... the range of 4.5–5, is consistent with normal oxime formation35 except there is a distortion in the sigmoidal shape at higher pH (i.e. 7.2 & 8). The asymmetry in the pH dependence curve is inverted in comparison to a typical oxime condensation (acetone with hydroxylamine),35 which shows a more prono ...
Synthesis of Aliphatic Nitro Compounds1i2 A simple new
... A duplicate run in which 40 g. of anhydrous phloroglucinol was present (DMSO and sodium nitrite dried as described above) was allowed to proceed for 8 hr. On working up as usual an 11% yield (5.3 g.) of 2-nitrooctane (b.p. 62'/2 mm.; n: 1.4281) and an 11% yield (5.3 g.) of 2-octyl nitrite (b.p. 35'/ ...
... A duplicate run in which 40 g. of anhydrous phloroglucinol was present (DMSO and sodium nitrite dried as described above) was allowed to proceed for 8 hr. On working up as usual an 11% yield (5.3 g.) of 2-nitrooctane (b.p. 62'/2 mm.; n: 1.4281) and an 11% yield (5.3 g.) of 2-octyl nitrite (b.p. 35'/ ...
Chemistry Name Mr. Reger Review Guide – Ch. 9
... a) What is the limiting reagent? b) How much of the excess reagent is left after the reaction is complete? c) How many moles of NaCl are produced? d) What mass of NaCl is produced? e) What is the % yield if actual amount obtained from the reaction is 6.8g NaCl? ...
... a) What is the limiting reagent? b) How much of the excess reagent is left after the reaction is complete? c) How many moles of NaCl are produced? d) What mass of NaCl is produced? e) What is the % yield if actual amount obtained from the reaction is 6.8g NaCl? ...
2nd Semester final review
... a. How many moles are dissolved in 2.4 L of a 3.6 M solution 8.64 moles b. How many mL of 0.75 M solution can be made with only 1.2 moles 1600 mL c. How many mL are needed to dissolve 100 g of CH3OH (molar mass 32 g = 1 mole) into a 3.6 M solution 868 mL 37. What is the difference between a solute, ...
... a. How many moles are dissolved in 2.4 L of a 3.6 M solution 8.64 moles b. How many mL of 0.75 M solution can be made with only 1.2 moles 1600 mL c. How many mL are needed to dissolve 100 g of CH3OH (molar mass 32 g = 1 mole) into a 3.6 M solution 868 mL 37. What is the difference between a solute, ...
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.