Lab #5 Chemical Reactions & Balancing Equations Objectives Observe and classify several chemical and physical changes. Give evidence for the occurrence of a chemical reaction. Write a balanced equation for a chemical reaction. Identify a reaction as a combination‚ decomposition‚ replacement‚ or combustion reaction. Background Physical properties can be observed without changing the chemical composition of the substance. Common physical properties that can be measured without changing the chemical
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Doctors In Training.com – USMLE Step 1 – Part 1 Emails – 2-9-2009 Today begins Part I of the Doctors In Training.com USMLE Step 1 Review Course. Below you will find 20 questions with specific page references to First Aid for the USMLE Step 1‚ 2009 edition. Twenty new questions similar to the ones below will arrive every Monday and Thursday to your email address from now until May 14th. These questions encourage you to study for the USMLE now and help you learn the high-yield information
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Data Tables: Part 1: |Chemicals|Well No.|Observations of the Reaction| A.|NaHCO3 + HCl||Bubbling in center of droplets. Homogeneous| B.|HCl + BTB||Turns yellow immediately after contact. Homogeneous| C.|NH3 + BTB||Turned dark blue. Homogeneous| D.|HCl + blue dye||Solution turns green immediately after contact. Homogeneous| E.|Blue dye + NaOCl||Stays blue. Homogeneous| | with the 1 drop of HCl||Mixes and turns a bluish green color. Homogeneous| F.|NaOCl + KI||Slightly yellowish tint to the
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Physical and Chemical Properties Purpose: The Physical and Chemical Properties lab provides the opportunity to investigate the physical and chemical properties of pure chemical substances and analyze the experiment results. Procedure: In the beginning of the experiment‚ I filled two 24-well plates half way with the given chemicals and sucked up these chemicals into their labeled pipets for later use. Following this‚ I performed a number of steps on each of the four test tubes and recorded observations
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Experiment 18 Chemistry 101 Redox Titration: Determination of the Percentage of Iron in a Sample INTRODUCTION The concentrations of redox-active species can be determined by redox titrations. In a redox titration‚ a measured sample of the unknown is titrated against a standard solution of a substance that will oxidize or reduce the unknown. In the present experiment you will take a sample containing iron‚ add acid to dissolve it [thereby converting all the iron to iron(II)]‚ then
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Our first meeting will be today. Use this method if you’d prefer to copy and paste your paper into a form. Use this method if you’d prefer to copy and paste your paper into a form. Use this method if you’d prefer to copy and paste your paper into a Our first meeting will be today. Use this method if you’d prefer to copy and paste your paper into a form. Use this method if you’d prefer to copy and paste your paper into a form. Use this method if you’d prefer to copy and paste your paper into form
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Describe a mingle activity you might create for a new class of intermediate level students to help them introduce themselves to each other. The best way to help students mingle with each other and enhance their proficiency in the English language is by using ice-breaker activities. This effectively encourages the participants to interact with each other freely. An activity which might be done is a ‘getting to know you’ activity where the participants will be given a certain period of time to gather
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During the lecture‚ Helen mentioned that this analysis mainly focuses on the macro-environmental influences on the business. The 4 areas to be concerned are Political‚ Economic‚ Social and Technological factors. PEST Analysis provides us with a overall big picture of the business to better understand the potential opportunities and threats behind it. Political Factors Political Factor refers to the government regulations under which the organizations should operate‚ for example‚ tax policy
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Chapter 6 - Answer Key to Section Review 1-3 Section Review 1 1. What is the main distinction between ionic and covalent bonding? Answer (A): Ionic bonding involves the electrical attraction between large numbers of anions and cations. Covalent bonding involves the sharing of electron pairs between two atoms. Translation: -Ionic bonding happens between a metal and a non-metal (east coast and west coast) -One atom completely donates its valence electrons to another atom -Metals
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Name: Tom Flannigan Title: Physical and Chemical Properties Purpose: To investigate the chemical properties of pure chemical substances. To investigate the physical properties of pure chemical substances. Procedure: For this lab we used four test tubes and poured equal amounts of a substance in each test tube. We then observed the color and odor. We then heated the substance and recorded the observation. The next tube we added cold water and observed the effects‚ then we heated it
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