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CIS Exam Questions
... C Increases the rate of both the forward and reverse reactions D Changes the position of the equilibrium of the reaction 2. In which of the following systems will the equilibrium be unaffected by a change in pressure? A 2NO2(g) N2O4(g) B H2(g) + I2(g) 2HI(g) C N2(g) + 3H2(g) 2NH3(g) D 2NO(g) + O2(g) ...
... C Increases the rate of both the forward and reverse reactions D Changes the position of the equilibrium of the reaction 2. In which of the following systems will the equilibrium be unaffected by a change in pressure? A 2NO2(g) N2O4(g) B H2(g) + I2(g) 2HI(g) C N2(g) + 3H2(g) 2NH3(g) D 2NO(g) + O2(g) ...
GCE Chemistry Question Paper Unit 05 - Energetics, Redox
... Write an equation for the reaction between phosphoric(V) acid and magnesium oxide. ...
... Write an equation for the reaction between phosphoric(V) acid and magnesium oxide. ...
1)A neutral atom has no overall charge, and ion is a
... Radium phosphate Ra3(PO4)2 Lithium selenate Li2SeO4 Lead (II) nitrate Pb(NO3)2 ...
... Radium phosphate Ra3(PO4)2 Lithium selenate Li2SeO4 Lead (II) nitrate Pb(NO3)2 ...
p Block Elements General Configuration: ns2 np1
... Nitrogen can form pπ-pπ multiple bond. Nitrogen exists as diatomic molecule with a triple bond. Heavier elements do not form pπ-pπ bonds as their atomic orbitals are so large and differs that they cannot have effective overlapping. P, As and Sb form P-P, As-As and Sb-Sb single bonds whereas Bi forms ...
... Nitrogen can form pπ-pπ multiple bond. Nitrogen exists as diatomic molecule with a triple bond. Heavier elements do not form pπ-pπ bonds as their atomic orbitals are so large and differs that they cannot have effective overlapping. P, As and Sb form P-P, As-As and Sb-Sb single bonds whereas Bi forms ...
Chemical Equilibrium
... • The equilibrium constant (K) is the ratio of the mathematical product of the concentrations of substances formed at equilibrium to the mathematical product of the concentrations of reacting substances. Each concentration is raised to a power equal to the coefficient of that substance in the chemic ...
... • The equilibrium constant (K) is the ratio of the mathematical product of the concentrations of substances formed at equilibrium to the mathematical product of the concentrations of reacting substances. Each concentration is raised to a power equal to the coefficient of that substance in the chemic ...
Examination - SCSA - School Curriculum and Standards Authority
... Write a balanced ionic equation to represent the reaction described below. Include all state symbols. ...
... Write a balanced ionic equation to represent the reaction described below. Include all state symbols. ...
Aqueous Solutions
... Figure 4.3: (a) The ethanol molecule contains a polar O—H bond similar to those in the water molecule. (b) The polar water molecule interacts strongly with the polar O—H bond in ethanol. This is a case of "like dissolving like." ...
... Figure 4.3: (a) The ethanol molecule contains a polar O—H bond similar to those in the water molecule. (b) The polar water molecule interacts strongly with the polar O—H bond in ethanol. This is a case of "like dissolving like." ...
Revised Higher 2014 Paper
... 2 For this section of the examination you must use an HB pencil and, where necessary, an eraser. 3 Check that the answer sheet you have been given has your name, date of birth, SCN (Scottish Candidate Number) and Centre Name printed on it. Do not change any of these details. 4 If any of ...
... 2 For this section of the examination you must use an HB pencil and, where necessary, an eraser. 3 Check that the answer sheet you have been given has your name, date of birth, SCN (Scottish Candidate Number) and Centre Name printed on it. Do not change any of these details. 4 If any of ...
MC84 - Southchemistry.com
... compound results in the appearance of a brown color. When this solution is shaken with the organic solvent, methylene dichloride, the organic solvent layer turns purple. The unknown compound probably contains (A) K+ (B) Br¯ (C) NO3¯ (D) I¯ (E) Co2+ 36. CuO(s) + H2(g) <===> Cu(s) + H2O(g); H = - 2.0 ...
... compound results in the appearance of a brown color. When this solution is shaken with the organic solvent, methylene dichloride, the organic solvent layer turns purple. The unknown compound probably contains (A) K+ (B) Br¯ (C) NO3¯ (D) I¯ (E) Co2+ 36. CuO(s) + H2(g) <===> Cu(s) + H2O(g); H = - 2.0 ...
Midterm Practice Exam Key
... 1. A substance is considered ____________ if it will dissolve in a specific solvent. 2. An ____________ in the oxidation number of an atom signifies oxidation, while a ____________ in the oxidation number signifies reduction. 3. A ____________ reaction is one in which the aqueous (dissolved) ions ...
... 1. A substance is considered ____________ if it will dissolve in a specific solvent. 2. An ____________ in the oxidation number of an atom signifies oxidation, while a ____________ in the oxidation number signifies reduction. 3. A ____________ reaction is one in which the aqueous (dissolved) ions ...
In chemistry, a salt is an ionic compound that
... ammonia) of the component ions. That slow, partial decomposition is usually accelerated by the presence of water, since hydrolysis is the other half of the reversible reaction equation of formation of weak salts. ...
... ammonia) of the component ions. That slow, partial decomposition is usually accelerated by the presence of water, since hydrolysis is the other half of the reversible reaction equation of formation of weak salts. ...
1.02 x 10 = 3 mol lit 3.4 x 10
... (i) Mg(OH)2 is sparingly soluble in water but highly soluble in ammonium chloride solution. Ans: Mg(OH)2 is a weak base. NH4Cl is acidic due to hydrolysis. So neutralization takes place and dissolves. (ii) When hydrogen sulphide is passed through acidified zinc sulphate solution, white ppt of zinc s ...
... (i) Mg(OH)2 is sparingly soluble in water but highly soluble in ammonium chloride solution. Ans: Mg(OH)2 is a weak base. NH4Cl is acidic due to hydrolysis. So neutralization takes place and dissolves. (ii) When hydrogen sulphide is passed through acidified zinc sulphate solution, white ppt of zinc s ...
Unit 11 acids and bases part 1
... This new bond is called a coordinate covalent bond since both new bonding electrons come from the same atom ...
... This new bond is called a coordinate covalent bond since both new bonding electrons come from the same atom ...
Analytical Chemistry
... Electrolytes are solutes which ionize in a solvent to produce an electrically conducting medium. Strong electrolytes ionize completely whereas weak electrolytes are only partially in the solvent. Table 1: Strong electrolytes 1.the inorganic acids HNO3,HClO4,H2SO4,HCl,HI, HBr,HClO3,HBrO3. 2.Alkali an ...
... Electrolytes are solutes which ionize in a solvent to produce an electrically conducting medium. Strong electrolytes ionize completely whereas weak electrolytes are only partially in the solvent. Table 1: Strong electrolytes 1.the inorganic acids HNO3,HClO4,H2SO4,HCl,HI, HBr,HClO3,HBrO3. 2.Alkali an ...
File
... of sodium hydroxide. statement and then blacken the corresponding space on 13. No precipitate is formed when a dilute solution of the answer sheet. A choice may be used once, more H2SO4 is added to a sample of the solution. than once, or not at all in each set. Question 14–17 wire VoltQuestions 1-3 ...
... of sodium hydroxide. statement and then blacken the corresponding space on 13. No precipitate is formed when a dilute solution of the answer sheet. A choice may be used once, more H2SO4 is added to a sample of the solution. than once, or not at all in each set. Question 14–17 wire VoltQuestions 1-3 ...
Gas Laws
... A solution that contains a small amount of solute per amount of solvent is called a dilute solution. A mixture in which the particles can only be seen with a laser and do NOT settle out upon standing is called a colloid. The amount of solute that can be dissolved in a solvent at a given temperature ...
... A solution that contains a small amount of solute per amount of solvent is called a dilute solution. A mixture in which the particles can only be seen with a laser and do NOT settle out upon standing is called a colloid. The amount of solute that can be dissolved in a solvent at a given temperature ...
Gas Laws
... 5.00 L. If the final pressure of the gas is 585 torr, what is its final temperature in Celsius? 350. oC 10. A gas has a volume of 350. mL at 740. torr. How many milliliters will the gas occupy at 900. torr if the temperature remains constant? 288 mL 10. Calculate the number of liters occupied by the ...
... 5.00 L. If the final pressure of the gas is 585 torr, what is its final temperature in Celsius? 350. oC 10. A gas has a volume of 350. mL at 740. torr. How many milliliters will the gas occupy at 900. torr if the temperature remains constant? 288 mL 10. Calculate the number of liters occupied by the ...
1984 Advanced Placement Exam
... answer sheet. A choice may be used once, more than once, or not at all in each set. Questions 1-3 (A) F ...
... answer sheet. A choice may be used once, more than once, or not at all in each set. Questions 1-3 (A) F ...
Acids and Bases
... If two wires connected to a light bulb and to a power source are placed in a beaker of water, the light bulb will not glow. If an electrolyte, such as sodium chloride, is dissolved in the water, the light bulb will glow because the solution can now conduct electricity. The amount of electric current ...
... If two wires connected to a light bulb and to a power source are placed in a beaker of water, the light bulb will not glow. If an electrolyte, such as sodium chloride, is dissolved in the water, the light bulb will glow because the solution can now conduct electricity. The amount of electric current ...
Hydroxide
Hydroxide is a diatomic anion with chemical formula OH−. It consists of an oxygen and hydrogen atom held together by a covalent bond, and carries a negative electric charge. It is an important but usually minor constituent of water. It functions as a base, a ligand, a nucleophile and a catalyst. The hydroxide ion forms salts, some of which dissociate in aqueous solution, liberating solvated hydroxide ions. Sodium hydroxide is a multi-million-ton per annum commodity chemical. A hydroxide attached to a strongly electropositive center may itself ionize, liberating a hydrogen cation (H+), making the parent compound an acid.The corresponding electrically neutral compound •HO is the hydroxyl radical. The corresponding covalently-bound group -OH of atoms is the hydroxyl group.Hydroxide ion and hydroxyl group are nucleophiles and can act as a catalyst in organic chemistry.Many inorganic substances which bear the word ""hydroxide"" in their names are not ionic compounds of the hydroxide ion, but covalent compounds which contain hydroxyl groups.