Chemical Reaction:- The transformation of chemical substance into another chemical substance is known as Chemical Reaction. For example: rusting of iron‚ setting of milk into curd‚ digestion of food‚ respiration‚ etc. In chemical reaction new substance is formed which is completely different in properties from the original substance‚ so in a chemical reaction chemical change takes place. Following are the signs of chemical reaction: (a) Change of state of substance. (b) Change of colour of substance
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Mahlaqua Imran Chemical and Physical Changes Lab 09/09/13 I. Purpose: Identify the different changes as a physical change or a chemical change. II. Safety: You may need safety goggles and gloves. III. Pre-lab questions: 1. Identify the following as either chemical or physical changes: a. Striking a match Chemical b. Food spoiling Chemical c. Breaking a glass Physical d. Mowing the grass Physical
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INVESTIGATION investigating the properties of Period 3 oxides Aim The purpose of this experiment is to examine the oxides of Period 3 elements and describe their bonding and structure. Introduction You carry out an investigation along similar lines to the work you did on the chlorides of the elements in Period 3 (Experiment 4.12). However‚ you will not be asked to test the oxides with cyclohexane because unlike the covalent chlorides‚ most of the oxides are not composed of discrete molecules. Therefore
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Determining the Stoichiometry of Chemical Reactions Mrs. Farrales Nikita Pandya October 23‚ 2012 December 3‚ 2012 INRODUCTION In the method of continuous variations the total number of moles of reactants is kept constant for the series of measurements. Each measurement is made with a different mole ratio of reactants. A mole ratio
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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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The purpose of this lab was to determine if a there is a change in mass when a gas is produced and determine if gas has mass. To conduct this experiment‚ the group must be careful not to let the Alka-Seltzer tablet get wet before the bottle is closed by wiping the lip of the bottle and the cap so it remains dry‚ or risk gas escaping into the air and not being captured by the bottle. Also‚ the group must be sure to close the bottle tightly with the cap‚ because gas may escape this way as well. During
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Sheet each of white and black paper‚ 1 Distilled water‚ Goggles-Safety‚ 1 Well-Plate-24‚1 Well-Plate-96‚ Bag-CK1 1 Pipet‚ Empty Short Stem‚ Experiment Bag Ionic Reactions 1 Barium Nitrate‚ 0.1 M - 2 mL in Pipet‚ 1 Cobalt (II) Nitrate‚ 0.1 M - 2 mL in Pipet1 Copper (II) Nitrate‚ 0.1 M - 2 mL in Pipet‚ 1 Iron (III) Nitrate‚ 0.1 M - 2.5 mL in Pipet‚ 1 Nickel (II) Nitrate‚ 0.1 M - 2 mL in Pipet‚ 1 Sodium Bicarbonate‚ 0.1 M - 2 mL in‚ Pipet‚ 1 Sodium Carbonate‚ 0.1 M - 2 mL in Pipet‚ 1 Sodium Chloride
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FORMAL LAB REPORT INTRODUCTION John Dalton’s atomic theory states that elements combine in simple numerical ratios to form compounds. A compound‚ no matter how it is formed‚ always contains the same elements in the same proportion by weight. The law of mass conservation states that mass can neither be created nor destroyed. In this experiment‚ the mass of the metal was not destroyed or created; the metal’s mass was simply changed into a compound form once the gas
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Name: Yaissa Fernandez 4.05: Chemical Reactions Data and Observations: Complete a data table that includes a prediction of reaction type‚ observations‚ and identification of reaction type for each reaction in the lab. (10 points) Reactants Prediction of Reaction type Observations Reaction Type Iron (III) and Copper (II) Sulfate Solution Single replacement Solids stay concentrated at the bottom Single replacement Lead (II) Nitrate and Potassium Iodide Solutions Double replacement Yellow powder
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objective: In this experiment‚ I decided to find out how temperature would affect endothermic reactions compared to exothermic reactions. An endothermic reaction absorbs energy in the form of heat. This reaction feels cold because it is taking heat away from its surroundings. It also releases gases. An exothermic reaction is a reaction that releases energy as heat. Since the energy is released‚ the exothermic reactions feel hot. Methods/Materials I did three experiments. I mixed lemon juice
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