Observations of Chemical and Physical Changes Hands-On Labs‚ Inc. Version 42-0182-00-03 Abstract: Observations: Exercise 1: Observations of a Chemical Change Data Table 1. Chemical Reactions. Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO3 Sodium Bicarbonate HCl Hydrochloric Acid A2 NaOCl Sodium Hypochlorite KI Potassium Iodide Observation 1: + Add 2 drops of starch Observation 2: A3 KI Potassium Iodide Pb(NO3)2 Lead Nitrate
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significance of each force acting on the diagram. (See Fig. 5–7b.) B 35 mm G A 30 5–2. Draw the free-body diagram of member AB‚ which is supported by a roller at A and a pin at B. Explain the significance of each force on the diagram. (See Fig. 5–7b.) A 8 ft 30 390 lb 13 12 5 800 lb ft 4 ft B 3 ft 320 5 Solutions 44918 1/23/09 5:11 PM Page 321 © 2010 Pearson Education‚ Inc.‚ Upper Saddle River‚ NJ. All rights reserved. This material is protected under all copyright laws
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Challenge #1 — The Penny Problem: The first challenge to complete is the Penny Problem. The radio station is giving the winner of this challenge a prize pack that includes tickets to see his or her favorite band in concert. To start off the challenge‚ the radio station has placed pennies in a cylindrical glass jar. Each penny is 0.75 inches in diameter and 0.061 inches thick. If the cylindrical glass jar containing the pennies has a diameter of 6 inches and a height of 11.5 inches‚ how many pennies
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build and nourish cells; and to provide energy. Food travels though the digestive tract by muscle contraction called peristalsis. This journey of digestion can take up to twenty four hours. Digestion begins in the mouth where the teeth break food down into smaller particles during mastication. Salivary glands secrete saliva which begins chemical digestion and keeps the food moist. Swallowed food is pushed into the pharynx by the contraction of multiple muscle of the face‚ neck and tongue. The soft
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Experiment #1 Title: Physical and chemical changes‚ and measurements in the metric system Name: Goh Kian Shen Lecturer: Dr. Anne Kee Hooi Ling Section: Chemistry 107A Date lab was performed: 17 January 2013 Aim: The aim of the experiment is to understand physical and chemical changes of different
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Project 2: Compare and Contrast Study Habits of Success and Concentration Patrick Seals Professor Molly Marie Foland English W132 October 9‚ 2013 Habits of Success and Concentration Sweat dripping down your face. Your body burns‚ you’re tired‚ weak‚ and ready to give up. But something inside of you says keep going‚ don’t stop! So you keep pushing until you can no longer push anymore. The feeling of accomplishment is unreal. Your body feels defeated
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Patrick Kelly 10/16/12 Physical and Chemical Changes Lab Question: How do you distinguish a physical and chemical change? Hypothesis: If we use these materials and use magnets‚ water‚ burners‚ and filters on the mixtures and elements given we should determine what kind of effect these materials given will have on these mixtures and elements‚ physical or chemical. Procedures: -Part A: Record all observations of Part A in Data Table 1 1. Label each substance on seven pieces of paper
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Answer for final exam of 2010 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | b | b | b | b | b | a | e | a | a | c | d | a | a | c | b | b | d | a | b | c | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | e | d | d | e | c | b | a | b | c | c | e | e | a | d | d | b | e | a | c | d | Part C: Question 44 a) Answer: 与习题一Question 45(a)相同。 b) Answer: 与习题一Question 45(b)相同。 c) Answer: 请上网找资料，比较分析西方国家用哪些政策来对付金融危机，比如
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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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Matter and its Properties Basic Building Blocks of Matter The fundamental building blocks of matter are atoms and molecules. These make up elements and compounds. An atom is the smallest unit of an element that maintains the properties of that element. And element is a pure substance made of only one kind of atom. A compound is the substance that is made from the atoms of two or more elements that are chemically bonded. Water is an example of a compound because it is one of many compounds that
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