soluble. C. Ammonium salts: Almost all ammonium salts are soluble. D. Sulfates: The sulfates of most common elements are soluble‚ except those of calcium‚ strontium‚ barium‚ and lead (II) ions. © 2010 Hands On Labs‚ Inc. LabPaq CK-1 103 E. Hydroxides: Most of the hydroxides are insoluble‚ except those of the alkali metals and barium; calcium hydroxide is moderately soluble. F. Halides: The chloride‚ bromide‚ and iodide salts are generally soluble‚ except those of silver‚ lead (II)‚ and mercury
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Version 017 – Exam 1 – Laude – (52455) This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 1 003 6.0 points What would be pH of a 1 M solution of a very expensive weak base‚ unobtainamine‚ whose pKb is 3.4? 6.0 points 1. 12.3 correct Consider a reaction with ∆Hrxn = 997 kJ · mol−1 . Which of the following pairs of K values and temperatures is possible for this reaction? 1. K1 =
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Chemistry 1 Revision Booklet Unit Chemistry 1 Syllabus At the beginning of each sub-section‚ activities are stated which develop candidates. skills‚ knowledge and understanding of how science works. Details are then given of the substantive contexts in which these skills‚ knowledge and understanding should be set. It is expected that‚ where appropriate‚ teachers will adopt a practical approach‚ enabling candidates to develop skills in addition to procedural knowledge and understanding. Note that
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Chemistry : 1. Aluminium hydroxide on thermal decomposition gives aluminium oxide and water 2. Iron (iii) oxide reacts with carbon forming iron and carbonmonoxide 3. Hydrogen peroxide reacts with lead sulphide forming lead sulphate and water 4. Lithium reacts with nitrogen forming lithium nitride 5. Nickel sulphate reacts with sodium phosphate to form nickel phosphate and sodium sulphate 6. Silver oxide reacts with hydrogen peroxide to form silver ‚ water and oxygen 7
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mol) / 0.025L = 0.03785 mol/L Ksp = [K+][HC4H4O6-] = (0.03785 ÷ 1mol/L) x (0.03785 ÷ 1 mol/L) = 1.433 x 10-3 1/T = 1/(28+273.15) = 3.6 x 10-3 ln Ksp = ln (1.433 x 10-3 )= -6.548 1/Temperature(1/K) (10-3 ) | ln Ksp | 3.3 | -6.548 | 3.5 | -6.92 | 3.4 | -6.801 | 3.2 | -6.07 | 3.1 | -5.384 | Table 2: The inverse of different temperatures and the ln for their respective Ksp. Graph 1: Graph of ln Ksp against 1/T Graph 1 is a graph of ln Ksp against 1/T. It is a linear graph
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pigment will give a different color. This pigment can be used to indicate pH. pH is the -log[H+]. Acids increase the concentration of hydrogen ions ([H+]) in a solution and therefore have a low pH. A base will increase the concentration of hydroxide ions ([OH-]) (decreasing the [H+]) in a solution and will have a high pH. Notes: *Another household item from which a pH indicator can be extracted is Ex-Lax. Phenolphthalein is a commonly used indicator available from most chemical supply
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lala clams‚ blood cockles‚ mussels‚ prawns‚ crayfish and flower crab. They will then be immersed in diluted sodium hydroxide at 85 celcius. Next‚ the shells are then washed with di-ionized water and demineralized to remove calcium carbonate by treating them in diluted hydrochloric acid at room temperature. In the 2nd phase‚ chitin will then be dissolved in less than 40% of Sodium Hydroxide‚ and heated to 90celcius which will convert the Chitin into Chitosan upon dissolving. The third phase will take
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which acid is reacted with the rocks to generate CO2. Calcium carbonate minerals contained within the rocks of Mars have quantities of CO2 which can be extracted using a double displacement reaction. Calcium Carbonate is an alkali‚ and when mixed with an HCI generates CO2. During the reaction hydrogen combines with one oxygen part of the Calcium Carbonate to produce H2O. Calcium reacts with the water element to produce an aqueous solution of Calcium Chloride CaCl2‚ therefor leaving Carbon and Oxygen
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extract. Onion has a characteristic smell. When a basic solution like sodium hydroxide is added To a cloth strip treated with onions then the smell cannot be detected‚ however an acidic solution does not destroy the smell of onion. Vanilla extract has a characteristic pleasant smell. If a basic solution like sodium hydroxide is added to it we cannot detect the characteristic smell of vanilla extract an
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Reaction with steam | Reaction with dilute acid | Reduction of oxides by carbon / carbon monoxide | Reduction of oxides by hydrogen | K | Forms oxides and peroxides | Violent‚ metal darts on surface of water‚ hissing sound‚ sparks formed; Metal hydroxide and hydrogen gas formed. | Very Violent reaction | Very Violent | No reaction (Metals are very reactive and form very stable oxides; A lot of energy is required to overcome the strong electrostatic forces of attraction between the ions) | No reaction
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