Chemistry Final Exam Version 10/7/14 Name: Student number: Directions: It is important that you provide answers in your own words. Please focus only on information from the text/eBook to create your own solutions. Please do not use direct information from an outside source (especially copying and pasting from an “answer” website). Use of direct information from an outside source is against school policy. All answers will be checked for plagiarism. Instances of plagiarism can result in
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Measurement of the Heat of Neutralization of an Acid CHM 152IN CRN: February 5‚ 2000 I. Purpose of Experiment The purpose of this lab is to measure the heat released in the reaction of an acid and a base. This will demonstrate an enthalpy reaction‚ showing energy being released. II. Chemicals and Equipment The following chemicals and equipment will be utilized for the experiment: |Chemicals |Equipment
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Sandeep Voleti- Period 4/5 Honors Chemistry Titration Lab Writeup Introduction Titration is a method‚ which is meant to find the concentration of either an acid or a base by adding a measured amount of it to a known volume and concentration of an acid or base1. Titration starts with a beaker or Erlenmeyer flask containing a very precise volume of the known concentration solution and a small amount of indicator‚ which is put underneath a burette containing the solution with unknown concentration1
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to the pH scale‚ it means that an acid is a substance that donates hydrogen ions. Because of this‚ when an acid is dissolved in water‚ the balance between hydrogen ions and hydroxide ions is shifted. Now there are more hydrogen ions than hydroxide ions in the solution (2). A base can increase the pH level by providing hydroxide and then being removed. The buffer section of this lab was used to stabilize the level of pH using 4 different types of samples. The pH levels of the
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Introduction The first law of thermodynamics states that the energy of the universe is constant. Heat is transferred when the atoms of one material vibrate and collide with the atoms of another material‚ thus transferring energy. For this reason‚ heats always travel from hot to cold objects and two objects will reach an equilibrium temperature. Materials and Methods 1. Oven 7. Test Tube 2. Pasco Temperature Probe 8. Stopper 3. Scale 9. Calorimeter 4. Samples of Metals
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Resolution of α-Phenylethylamine Date of Completion of Experiment: Monday‚ November 19‚ 2012 Date Report Submitted: Monday‚ December 3‚ 2012 Objective of Experiment The objective of this experiment was to learn the process of resolution of α-phenylethylamine. Materials Compound | Molecular Weight (g/mol) | Melting Point (°C) | Amount used | Moles used | (+) Tartaric Acid | 150.087 | 171–174 | 11.9 g | 7.93 x 10-2 | (+‚-) α-phenylethylamine | 121.18 | 184-186 | 10.0 ml | 8.25 x 10-2 |
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Institute of Chemistry‚ University of the Philippines‚ Diliman‚ Quezon City 1101 Philippines Results and Discussion Eight Styrofoam ball calorimeters were calibrated. Five milliliters of 1M hydrochloric acid (HCl) was reacted with 10 ml of 1M sodium hydroxide (NaOH) in each calorimeter. The temperature before and after the reaction were recorded; the change in temperature (∆T) was calculated by subtracting the initial temperature from the final temperature. The reaction was performed twice for every
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contain crude protein (37% - 21%)‚ crude fibre (23 — 22%)‚ crude fat (3.10 — 20%)‚ carbohydrate (16 — 24%) total ash content (2.0 — 3. 10%)‚ Moisture (1.68 — 1.82%). The spices are sources of minerals comprising of calcium‚ Iron Zinc‚ Copper‚ Magnesium‚ Sodium and Potassium. phytochemical screening revealed the presence of saponins‚ flavonoids as well as hydrogen upanmides. These bloactive substances may be responsible for the biological properties of the plants. Key words: chemical composition‚ phytochemical
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The aim of this experiment was to calculate the concentration of an unknown solution of Sodium Hydroxide (NaOH) by titrating it with Hydrochloric Acid (HCl) and to identify any possible sources of error. A colour change from pink to yellow signified the end of each individual titre as the NaOH had been neutralised. Experimental: Method: Firstly two solutions were prepared to show the colour of the Phenol Red indicator in acid and alkaline conditions. These colours were then used to determine the
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reaction between copper and the solution of copper II sulfate. Materials: Apparatus: Copper II sulfate Spot Plate Copper Wire Beaker Zinc Spoon Sodium Chloride (NaCl) Paper Towels Waste Petri Dish Gloves Lab Coat Safety Googles Pipettes Forceps Spatula Procedure: •
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