Mg | Silver | Odorless | Slight change of color and expansion | No Reaction | Substance became buoyant‚ gas produced | No Reaction | Gas and heat produced‚ substance dissolved | No Reaction | Cu | Copper | Odorless | Added Sheen | No Reaction | No Reaction | No Reaction | No Reaction | No Reaction | Zn | Metallic Silver | Odorless | No Reaction | No Reaction | No Reaction | No Reaction | Substance dulled‚ gas produced | No Reaction | MgO | White | Odorless | No Reaction | Substance opaque color
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Experiment: Observations of Chemical and Physical Changes Derrick Davis Lab partner: None Location: My house Date Performed 25 Feb 15; 1600 CHE111-CO2 Photo 1 (Photo of me properly wearing safety goggles holding the student information card) Abstract: In chemistry it is important to understand the difference between physical and chemical changes. The objective of this experiment was to perform tests using heat or chemical mediators and observe the results for any physical or chemical changes
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Ammonia and Its Salts 1. Ammonia‚ NH3 is a very important compound in industry. 2. The main uses of ammonia: a) To manufacture nitrogenous fertilizers such as ammonium sulphate‚ ammonium nitrate and urea b) The liquid form is used as a cooling agent (refrigerant) in refrigerators c) As a raw material for the manufacture of nitric acid in the Ostwald process d) To be converted into nitric acid used for making explosives e) As an alkali to prevent the coagulation of latex
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Iron powder will react with cupric sulfate in a onetoone ratio (1 mole to 1 mole). The students will also be able to more easily visualize the size of a mole of iron and copper. The result obtained in this lab usually have less than a one percent error. Fe(s) + CuSO4 (aq) > FeSO4(aq) + Cu(s) Iron powder cupric sulfate ferrous sulfate copper In the reaction‚ iron will be the limiting reagent; it will be completely used up in the reaction. Cupric sulfate will be in excess; not all of it will be used up in the reaction
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CALORIMETRY INTRODUCTION Calorimetry is used to determine the heat released or absorbed in a chemical reaction (1).Trustees of darmouth college states that (1) is used to determine the heat released or absorbed in a chemical reaction. To determine the heat released or absorbed in a chemical reaction an instrument called calorimeter is used. A calorimeter is an instrument used for measuring the heat of a reaction during a well defined process (2). Brucat states that (2) a calorimeter is an instrument
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bDATES PERFORMED: JANUARY 8‚ 2013 CHEMICAL EQUILIBRIUM D.M. TAN1 AND P.B. ALEGRO2 1DEPARTMENT OF MINING‚ METALLURGICAL‚ AND MATERIALS ENGINEERING‚ COLLEGE OF ENGINEERING 2 INSTITUTE OF CHEMISTRY‚ COLLEGE OF SCIENCE UNIVERSITY OF THE PHILIPPINES‚ DILIMAN QUEZON CITY‚ PHILIPPINES RECEIVED JANUARY 15‚ 2013 RESULTS AND DISCUSSION A. Iron- Silver Equilibrium The first part of the experimentation focuses in the iron-silver system. Silver nitrate (AgNO3) was added to ferrous
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H2O|HotH2O|Litmus Test|Dilute HCI|Dilute NaOH| Mg|Silver|None|None|None|None|R-NoneB-None|Bubbling|None| Cu|Gold|None|None|None|None|R-NoneB-None| None|None| Zn|Silver|None|None|None|None|R-Turned blueB-none|Bubbling|None| MgO|White|None|None|None|None|R-Turned blueB-None|Bubbling|None| CuCO3|Green|None|Turned Black|None|None|R-NoneB-None|Turned lime green and bubbled|Turned Teal| Cu(NO3)2|Blue|None|None|Dissolves|None|R-NoneB-Turned orange|Turned green|None| NaCl|White|None|None|Turns clear|Dissolves|R-NoneB-None|None|None|
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香港考試及評核局 HONG KONG EXAMINATIONS AND ASSESSMENT AUTHORITY 香港中學文憑考試 HONG KONG DIPLOMA OF SECONDARY EDUCATION EXAMINATION 練習卷 PRACTICE PAPER 化學 試卷一 CHEMISTRY PAPER 1 評卷參考 MARKING SCHEME (2012年2月22日修訂稿) (updated as at 22 Feb 2012) Hong Kong Examinations and Assessment Authority All Rights Reserved 2012 PP-DSE-CHEM 1–1 權版留保 局核評及試考港香 © 。旨之巧技用運與力能解理重着試考違有亦 ，難解及對應懂學，習學善改生學助無既，度態習學種這。吞生剝 活，記死背硬，案答準標為視考參卷評將應不生學。用之考參生學 和師教供，寫編而卷習練科本為專局核評及試考港香乃考參卷評本 This marking scheme has been prepared by the Hong Kong
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ions. Benedict’s solution contains sodium bicarbonate‚ sodium citrate and copper sulfate. If combined with a reducing sugar and heated‚ the divalent copper ion Cu of copper sulfate is reduced to the monovalent copper ion of cuprous oxide Cu2O which forms a precipitate ranging in color from green to brick red. Glucose + CuSO4 + heat -------------- Cu2O + H2O + oxidized glucose • Lipids such as fats and oils are important in cell membranes and also as an energy reserve. They produce
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of this lab was to be able to predict the phase of matter after a double replacement reaction‚ what the products were‚ and if the reaction was completed or not. Materials and Methods - • .1 M NaCl • .1 M AgNO3 • .1 M Na3PO4 • .1 M NaOH • .1 CuSO4 • Five droppers • Spot Plate • Pen/Pencil • Paper • Goggles • Apron Safety Precautions – • Wear goggles and apron at all time while inside the lab. • You may use rubber gloves o protect your hands from the chemicals that will be used in
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