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chemistry 2.1
... This achievement standard requires the student to present a report on the ‘Chemistry used in the development of a current technology’, using appropriate chemistry vocabulary, symbols and conventions (including names, formulae and equations). Before beginning this assessment, students will need to ha ...
... This achievement standard requires the student to present a report on the ‘Chemistry used in the development of a current technology’, using appropriate chemistry vocabulary, symbols and conventions (including names, formulae and equations). Before beginning this assessment, students will need to ha ...
chemical change
... The evidence for a chemical reaction occurring, is the formation of a substance which is different from the original reactant or reactant, this is often accompanied by changes in energy, which are measured as temperature changes. Thus for the reaction of the silver metal sodium with the green/yellow ...
... The evidence for a chemical reaction occurring, is the formation of a substance which is different from the original reactant or reactant, this is often accompanied by changes in energy, which are measured as temperature changes. Thus for the reaction of the silver metal sodium with the green/yellow ...
Document
... C Reduction increases the oxidation number. D Oxidation and reduction have no effect on the oxidation numbers.I ...
... C Reduction increases the oxidation number. D Oxidation and reduction have no effect on the oxidation numbers.I ...
Worksheet
... The data above were gathered in order to determine the density of an unknown solid. The density of the sample should be reported as (A) 0.5 g/cm3 (B) 0.50 g/cm3 (C) 2.0 g/cm3 (D) 2.00 g/cm3 (E) 2.27 g/cm3 28. If 87 grams of K2SO4 (molar mass 174 grams) is dissolved in enough water to make 250 millil ...
... The data above were gathered in order to determine the density of an unknown solid. The density of the sample should be reported as (A) 0.5 g/cm3 (B) 0.50 g/cm3 (C) 2.0 g/cm3 (D) 2.00 g/cm3 (E) 2.27 g/cm3 28. If 87 grams of K2SO4 (molar mass 174 grams) is dissolved in enough water to make 250 millil ...
82KB - NZQA
... releases a colourless gas, carbon dioxide, CO2, and forms another white solid calcium oxide, CaO. CaCO3(s) → CaO(s) + CO2(g) When white calcium hydroxide solid, Ca(OH)2, is strongly heated it releases a colourless gas, water, H2O, and also forms the white solid calcium oxide, CaO. Ca(OH)2(s) → CaO(s ...
... releases a colourless gas, carbon dioxide, CO2, and forms another white solid calcium oxide, CaO. CaCO3(s) → CaO(s) + CO2(g) When white calcium hydroxide solid, Ca(OH)2, is strongly heated it releases a colourless gas, water, H2O, and also forms the white solid calcium oxide, CaO. Ca(OH)2(s) → CaO(s ...
chemistry intermediate may 2010 marking scheme
... (c) G is a colourless volatile liquid with empirical formula CH and relative molecular mass 78. G reacts with a warm mixture of concentrated nitric and sulfuric acid to form a yellow oily liquid H. Heating H with tin and concentrated hydrochloric acid produces another liquid I. (d) The white crystal ...
... (c) G is a colourless volatile liquid with empirical formula CH and relative molecular mass 78. G reacts with a warm mixture of concentrated nitric and sulfuric acid to form a yellow oily liquid H. Heating H with tin and concentrated hydrochloric acid produces another liquid I. (d) The white crystal ...
Infrared Spectroscopy and Mass Spectroscopy
... •Find MW by other method Other compounds present may give ions that deceive us. May be more detectable. •Prepare derivative MS intensities are problematic ...
... •Find MW by other method Other compounds present may give ions that deceive us. May be more detectable. •Prepare derivative MS intensities are problematic ...
National 5 - Deans Community High School
... Copy the graph showing reaction A and add the corresponding curves which could have been obtained for experiments B, C and D. (Label each curve clearly.) 18. The collision theory states that for two molecules to react, they must first collide with one another. Use the collision theory to explain the ...
... Copy the graph showing reaction A and add the corresponding curves which could have been obtained for experiments B, C and D. (Label each curve clearly.) 18. The collision theory states that for two molecules to react, they must first collide with one another. Use the collision theory to explain the ...
Belarus, National Final, 2008 (PDF 405K).
... Compound X is excreted in urine. The amount of X present in the body is proportional to the mass of muscle tissue. a) Draw structural formulas for compounds A through X and for each of the following amino acids: Gly (glycine), Orn (ornithine or 2,5-diaminopentanoic acid), and SAM (S-adenosyl methion ...
... Compound X is excreted in urine. The amount of X present in the body is proportional to the mass of muscle tissue. a) Draw structural formulas for compounds A through X and for each of the following amino acids: Gly (glycine), Orn (ornithine or 2,5-diaminopentanoic acid), and SAM (S-adenosyl methion ...
CHEM 30
... - express the concentrations of solutions using: Molarity (M, mol/L) , %weight by volume, ppm and ppb; use c = n/v to solve problems regarding solutions - using the dilution formula C1V1 = C2V2; apply to serial dilutions - use the solubility table to devise qualitative analysis separation of ions in ...
... - express the concentrations of solutions using: Molarity (M, mol/L) , %weight by volume, ppm and ppb; use c = n/v to solve problems regarding solutions - using the dilution formula C1V1 = C2V2; apply to serial dilutions - use the solubility table to devise qualitative analysis separation of ions in ...
oxidation and reduction
... Paper copies of the A-Level Chemistry Questionsheets may be copied free of charge by teaching staff or students for use within their school, provided the Photocopy Masters have been purchased by their school. No part of these Questionsheets may be reproduced or transmitted, in any other form or by a ...
... Paper copies of the A-Level Chemistry Questionsheets may be copied free of charge by teaching staff or students for use within their school, provided the Photocopy Masters have been purchased by their school. No part of these Questionsheets may be reproduced or transmitted, in any other form or by a ...
Net ionic equation
... “insoluble” compounds will dissolve to a slight extent. For “soluble” compounds there will be a limit as to the amount of compound that will dissolve in a given amount of water. We can also discuss solubility in other solvents. ...
... “insoluble” compounds will dissolve to a slight extent. For “soluble” compounds there will be a limit as to the amount of compound that will dissolve in a given amount of water. We can also discuss solubility in other solvents. ...
Unit F335/01
... (c) At 500 K, the equilibrium constant for equation 1.1 is 7.76 × 10–3. In an equilibrium mixture at 500 K, the concentrations of hydrogen and carbon dioxide are: [H2] = 1.00 × 10–5 mol dm–3 [CO2] = 3.46 × 10–5 mol dm–3 Calculate the equilibrium concentrations of H2O and CO at 500 K. Assume the H2O ...
... (c) At 500 K, the equilibrium constant for equation 1.1 is 7.76 × 10–3. In an equilibrium mixture at 500 K, the concentrations of hydrogen and carbon dioxide are: [H2] = 1.00 × 10–5 mol dm–3 [CO2] = 3.46 × 10–5 mol dm–3 Calculate the equilibrium concentrations of H2O and CO at 500 K. Assume the H2O ...
s-BLOCK ELEMENTS - einstein classes
... The chlorides of both beryclium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong Lewis acids. They are ...
... The chlorides of both beryclium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong Lewis acids. They are ...
Carboxylic Acids - BSAK Chemistry weebly
... • Acyl chlorides: These contain a -COCl group, e.g. ethanoyl chloride, CH3COCl, or benzoyl chloride, C6H5COCl • Alkyl chlorides: These have a chlorine attached to a carbon chain, e.g. chloroethane, C2H5Cl • Aryl chlorides: These have a chlorine attached directly to a benzene ring, e.g. chlorobenzen ...
... • Acyl chlorides: These contain a -COCl group, e.g. ethanoyl chloride, CH3COCl, or benzoyl chloride, C6H5COCl • Alkyl chlorides: These have a chlorine attached to a carbon chain, e.g. chloroethane, C2H5Cl • Aryl chlorides: These have a chlorine attached directly to a benzene ring, e.g. chlorobenzen ...
Exam #2
... 43. Which of the following does NOT behave as an electrolyte when it is dissolved in water? (A) CH3OH (B) K2CO3 (C) NH4Br ...
... 43. Which of the following does NOT behave as an electrolyte when it is dissolved in water? (A) CH3OH (B) K2CO3 (C) NH4Br ...
1044771584 - Papacambridge
... Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included ...
... Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included ...
Oxidation-Reduction Reactions Oxidation-Reduction
... The concentration of aqueous I3- solution can be determined by titration with aqueous sodium thiosulfate, Na2S2O3. What is the molarity of I3- if 24.55 mL of 0.102 M Na2S2O3 is needed for complete reaction with 10.00 mL of the I3- solution? The net ionic equation is: 2 S2O32- (aq) + I3- (aq) S4O62- ...
... The concentration of aqueous I3- solution can be determined by titration with aqueous sodium thiosulfate, Na2S2O3. What is the molarity of I3- if 24.55 mL of 0.102 M Na2S2O3 is needed for complete reaction with 10.00 mL of the I3- solution? The net ionic equation is: 2 S2O32- (aq) + I3- (aq) S4O62- ...
Balancing Redox Reactions 1 - VCC Library
... electrons lost in the oxidation process must equal the total number of electrons gained during the reduction process. In a redox reaction, the substance that gets oxidized (that loses electrons) is called the reducing agent because it reduces the other substance by giving its electrons. The substanc ...
... electrons lost in the oxidation process must equal the total number of electrons gained during the reduction process. In a redox reaction, the substance that gets oxidized (that loses electrons) is called the reducing agent because it reduces the other substance by giving its electrons. The substanc ...
Acid and Bases: Alkalinity and pH in Natural Waters.
... The proton, Acid & Bases that are either strong or weak At the beginning of the past century (ca. 1920), chemists established the conceptual framework for dealing with acid-base reactions. They realized the important role of the proton, H+, and the fact that this proton was actually hydrated when i ...
... The proton, Acid & Bases that are either strong or weak At the beginning of the past century (ca. 1920), chemists established the conceptual framework for dealing with acid-base reactions. They realized the important role of the proton, H+, and the fact that this proton was actually hydrated when i ...
Chemistry II Exams and Answer Keys 2015 Season
... 4. A 1.000 g sample of nickel ore is dissolved in acid. The nickel(II) ions are precipitated by DMGO (dimethyl glyoxime) solution according to the following equation: Ni2+(aq) + 2C4H8N2O2 → Νi(C8H14ON4O4)2(s) + 2H+(aq) The precipitate is filtered and washed. Then, it is heated gently to dryness. The ...
... 4. A 1.000 g sample of nickel ore is dissolved in acid. The nickel(II) ions are precipitated by DMGO (dimethyl glyoxime) solution according to the following equation: Ni2+(aq) + 2C4H8N2O2 → Νi(C8H14ON4O4)2(s) + 2H+(aq) The precipitate is filtered and washed. Then, it is heated gently to dryness. The ...
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.