by the molar mass. Experiment 1 First I took a crucible‚ a balance‚ and a Bunsen burner and placed them onto the workbench. Then I measured the mass of the empty crucible with the balance and recorded it in my notes. Next I added 5 g of the copper sulfate hydrate to the crucible. I measured the mass of the crucible with the balance and recorded it in my notes. Then I moved the crucible onto the Bunsen burner and
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32‚175‚000 µm ii. 3.3000 x 107 kg iii. 0.04721 m iv. 8751 cm3 Answer: i. 3.2 x 107 µm ii. 3.3 x 107 kg iii. 0.047 m iv. 8.8 x 103 cm3 Question 12: An empty crucible has a mass of 25.70 g. After some copper(II) sulfate pentahydrate is added‚ the mass is 28.855 g. What is the mass of the copper(II) sulfate pentahydrate in the crucible? Answer: 3.16 g Question 13: Assuming that all are measured
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equations‚ of copper and aluminium and describe the environmental impact of these extraction processes. Copper There are two main methods used to extract copper from its ores. Generally‚ copper is extracted using the Pyrometallurgical method (also known as smelting)‚ which allows us to separate copper from its sulfide and oxide ores; the other method‚ called the Hydrometallurgical method (also known as solvent extraction or electrowinning - SX/EW)‚ allows us to also separate copper from its oxide
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Draw the structures of white phosphorus and red phosphorus. Which one of these two types of phosphorus is more reactive and why? Explain the following observations: (i) Generally there is an increase in density of elements from titanium (Z = 22) to copper (Z = 29) in the first series of transition elements. Transition elements
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can get many others from applying two simple patterns. Name of polyatomic ion | Formula and charge | Ammonium ion | NH4+ | Acetate ion | C2H3O2- | Cyanide ion | CN- | Hydroxide ion | OH- | Nitrate ion | NO3- | Chlorate ion | ClO3- | Sulfate ion | SO42- | Carbonate ion | CO32- | Phosphate ion | PO43- | * Pattern 1: The -ates “ate” one more oxygen than the -ites and their charge doesn’t change as a result! For instance‚ if you know nitrate is NO3-‚then nitrite is NO2-.If you know
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measuring the enthalpy change for the solution‚ it is suggested to measure the temperature of the ascorbic acid solution for 30 seconds before putting in the d-block element in order to have a plateau temperature of the original solution in order to compare with the product temperature later. In my experiment‚ I waited 30 seconds for the ascorbic acid power to dissolve in water‚ I should have measured the temperature then put in the element to have more data to support the enthalpy change
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University of Nebraska at Omaha Bomb Calorimetry Physical Chemistry 3354 Enthalpy of Combustion: 1‚2-diphenylethane January 6‚ 2014 Author: Jon D. Paul Signature Professor: Dr. Edmund Tisko Date Abstract Experimentation involving constant volume calorimetry produces the heat of reaction for many substances. When choosing adiabatic conditions we are allowed to focus on the reaction system while neglecting everything else. The reactions that are studied should proceed relatively
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Le Chatelier’s principle and chemical equilibrium systems Jan Samuel Matuba‚ Mark Cel Gonzaga Chemical Engineering Department‚ College of Engineering‚ University of the Philippines‚ Diliman 1100 ------------------------------------------------- January 11‚ 2012 DISCUSSION Reaction rates determine the speed at which products are formed from the reactants. Expressed as concentration divided by time‚ reaction rates measure the rate of disappearance of the reactants‚ and‚ conversely‚ the rate
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questions 1. Ammonium nitrate‚ NH4NO3‚ dissolves readily in water according to the equation: NH4NO3(s) NH4+(aq) + NO3-(aq) H = 28kJ mol-1 Which of the following contribute(s) to the occurrence of this process? I. The system moves to lower enthalpy. II. The system becomes more disordered. a. I only b. II only c. Both I and II d. Neither I nor II 2. Which substance has the largest lattice energy? a. NaF b. KCl c. MgO d. CaS 3. A certain reaction is spontaneous below 100oC but is
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- microspatula - lab burner - dropper pipet - 5 test tubes - mortar and pestle - test tube rack - magnet - test tube holder - insulating pad - watch glass - safety goggles - glass square - lab apron or coat - copper sulfate pentahydrate - iron fillings - sodium chloride - magnesium ribbon - hydrochloric acid - paper (5 cm x 10 cm) - silver nitarate - birthday candle - sulfur - matches Procedure: 1. Place a small amount of wax from a birthday
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