whether a chemical reaction has taken place? ” Prediction: *Using metal magnesium as an example illustration I. (Magnesium reacts with lead (II) nitrate) Mg + Pb(NO3)2 Pb + Mg(NO3)2 II. (Magnesium reacts with zinc nitrate) Mg + Zn(NO3)2 Zn + Mg(NO3)2 III. (Magnesium reacts with iron (III) nitrate) 3Mg + 2Fe(NO3)3 2Fe + 3Mg(NO3)2 Variables: The dependent variable for this investigation is the reactivity of each metal as measured by the occurring of chemical reactions
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A Sequence of Chemical Reactions: Transforming Copper Briefly describe. a) Why must you carry out the oxidation of Cu with HNO3 in a fume hood? Concentrated nitric acid is a toxic oxidant. Avoiding skin contact or inhalation is highly important. The reaction between Cu and HNO3 produces NO2‚ a toxic brown gas; therefore working under the fume is necessary in order to prevent inhaling the toxic gas. b) Why you should be particularly careful when you work with 3 M H2SO4 solution? Sulfuric acid
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ACADEMY Aim The aim of this investigation is to determine the formula of the complex ion formed from copper (II) ions and ammonia through colorimetry. Results Raw Data Table 1: The Effect of CuSO4:NH3 Volume Ratio (cm³) (±0.05) on Absorbance (±0.01) Independent Variable: Volume (cm³) (±0.05) CuSO4 NH3 0.00 0.00 1.00 9.00 1.50 8.50 2.00 8.00 2.50 7.50 3.00 7.00 4.00 6.00 5.00 5.00 Dependent Variable: Absorbance (±0.01) Trial 1 0.00 0.14 0.22 0.23 0.10 0.10 0.09
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color Part C Observations Solution becomes darker Part D Observations Mixture goes back to its natural state Part E Observations Bubbling Heat is generated Liquid is clear In-Lab Discussion 1) A. Cu (NO2)2 Cu (OH)2 B. Cu (OH)2 CuO C. CuO CuSO4 D. CuSO4 Cu0 Post Lab Discussion 2) 1.95/0.91*100= 214%; we were not able to verify the Law of Conservation of Mass within 5% of the
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Identification and Production of Materials ================================ Ethene‚ Polymers and Ethanol ================================ Catalytic Cracking Oil refineries need to balance their outputs of various products (petrol‚ diesel‚ fuel oil‚ etc.) to match the demands of the marketplace. Catalytic cracking is the process in which high molecular weight (high boiling point) fractions from crude oil are broken into lower molecular weight (lower boiling point) substances in order to increase
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← Muon ← Is created when a neutrino collides and combines with an H2O proton (weak force) ← Creates blue light ← High energy; travels faster than the speed of light (in water) ← Neutrino ← Type of particle: Lepton (like electrons and muons) ← Most abundant particle in the universe ▪ 1016 neutrinos are passing through your body at any point in time ← Theoretically discovered by Wolfgang Pauli (1930); actually discovered in 1955 ← Produced during nuclear reaction or changes
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of moles of the reactants Dependent Variable: The limiting reagent Constant Variable: The volume of reactants added Equipment: 2 100 ml beaker 2 measuring cylinders 10 ml of 0.1 molL-1 HCL(aq)‚ NAOH(aq) 20 ml of 0.1 molL-1H2SO4(aq)‚ CuSO4(aq) 30 ml of 0.1 molL-1 Ba(NO3)2(aq) Universal indicator Filter Paper Funnel 4 test tubes Reaction A- Method: 1) Measure 10 ml of 0.1 molL-1 of Hydrochloric Acid using a measuring cylinder. 2) Measure 10 ml of 0.1 molL-1
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Experiment to investigate the effect of concentration of electrolyte on the current of voltaic cell Aim The aim is to identify the relationship between the concentration of H2SO4 solution and the current of Cu-Zn voltaic cell. Hypothesis My hypothesis is that the greater the concentration of sulfuric acid the bigger the current of the voltaic cell. In a voltaic cell‚ chemical energy is concerted to electrical though the oxidation and reduction happen on the electrodes. Current will not flow
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January 4‚ 2013 Chemistry Honors Title: Hydrates Purpose: To find the mass percentage of water in the hydrate. Materials: * Watch glass * 2.82 g hydrated crystal (CuSO4*5H2O) * Evaporating dish * Bunsen burner * Electronic balance * Metal tongs * Ring stand Procedure: 1) Determine the mass of evaporating dish and watch glass. 2) Add between 2 and 3 grams of the hydrated crystal to the evaporating dish. 3) Determine the mass of the dish and crystal
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FERROUS AND NON-FERROUS ALLOYS Unit – 7 Ferrous: Iron based alloys Non-ferrous: other than ferrous alloys with no iron content FERROUS METALS AND ALLOYS What is a ‘ferrous metal’ or ‘ferrous alloy’? It is simply a metal or alloy that contains Iron (the element ferrous) as the base (starting) metal. 26th element Iron or Ferrous 55.85 Atomic Mass GENERAL CATEGORIES OF FERROUS METALS AND ALLOYS Carbon and alloy steels Stainless steel Tool and Die steel Cast Irons Cast
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