Lab # 4 : The Redox Arena II Procedural Summary There will be three different sized test tubes that will be used in this experiment, a boiling tube, a large and small test tube. The boiling tube will be labeled “R” for “reactants”. A scale with a weighing paper will be tared before adding 2 grams of granular zinc (Zn), record the mass, and then move the zinc to the boiling (R) tube. Weigh out 2 grams of iodine crystals, record it, and this will be added to the R tube, with the zinc. The R tube will then be put in a large beaker.
The manufacturing of these little soldiers for athletes relies on the principles of thermochemistry. The mixture of ammonium nitrate and water relies on endothermic properties or in this case when heat is absorbed to create the cold sensation in an ice pack. A device used to measure the quantity of heat transferred to or from an object is called a calorimeter. In most science labs it is more commonly referred to as a Styrofoam cup or a coffee cup calorimeter. In our lab we use a more sophisticated one which included a lid on the cup with an inserted thermometer and a stirrer.
You dispose of it in the designated container for broken glass. 2. While in the laboratory, chemicals in a test tube shoot out the end of the test tube and into someone’s eyes. Explain the procedure that should be followed. (5 pts.)
hoSpecific heat capacity in liquids Specific heat capacity in liquids How do liquid filled radiators work and what are the useful properties of these liquids? Liquid-filled electric radiators are sealed units that have an internal heating element that releases heat through the outer case; however the elements are put in a liquid such as: oil, water or heat transfer agent. Depending on the design of the radiator, the heat generated can be through radiation or a combination of radiation and convection (1). (10) (10) The liquid used is anti-freeze which is made up of ethylene and propylene glycol (13). Ethylene glycol is mixed with water so it is 50% of each liquid in the solution and has the highest boiling point than any other radiator fluid (5); its boiling point is 197.3°C and has a melting point of -12.9°C (12).
Objective: To observe the physical properties of solids containing: ionic, polar covalent, nonpolar covalent, network covalent, and metallic bonds. Thus, being able to classify unknown solids into the appropriate bonding categories based on their physical properties. Materials: - Test tubes - Test tube clamp - Bunsen burner - Distilled water - Conductivity probe - A spatula - One compound from each category (ionic, polar covalent, nonpolar covalent, network, and metallic) - Acetone/hexane mixture - Parafilm Methods: One compound from the following compounds was obtained from the professor: ionic, polar covalent, nonpolar covalent, network, and metallic. The following tests were carried out on each sample and the observations were recorded. For the metal sample, only steps one and five were conducted.
Chem 107 1/27/12 Laboratory Assignment Glass Working Using Burners 1. The two Burners shown are Bunsen and fisher. 2. How is the amount of gas entering the burners controlled? The amount of gas entering the burners is controlled by the needle gas valve on the bottom of the burners.
Purpose: The purpose of this lab is to investigate whether mass is gained or lost during a chemical reaction. Hypothesis: It will be found out that the mass is neither gained nor lost during a chemical reaction but transferred. Materials: * Safety goggles * Erlenmeyer flask * Balance * Graduated Cylinder * Beaker * Iron (III) chloride solution * Copper (II) sulphate solution * Sodium bicarbonate * Test tubes (small, and large) * Rubber Stopper * Tweezers * Paper towel * Scoopula * Sodium hydroxide solution * Hydrochloric acid Procedure: 1. 5ml of iron (III) chloride was measured and placed in the Erlenmeyer flask. 2.
Jessica Atanova CHEM 104 lab 03/10/14 SUBSTANCES Granular zinc- gray crystal like | Iodine crystals- dark, circular, rock-like | De-ionized water: used for standard Zinc Ion procedure. | Materials: Boiling tube: for products. | Small test tubes: used to centrifuge the solution and precipitate | Graduated cylinder: used for measurement of water | Stirring rod: used various times to stir samples and solutions. | Spatula: used to measure and transfer the substances. | Centrifuge: used to isolate the solid from the solution | .
* What is this substance This substance is iodide Confidence Report The aim of extraction, is to separate a part of raw material, using a solvent such as water with heat. A tincture of iodine is a common medicine sold in many pharmacies, used as an antiseptic on cuts of the skin. The objective of the seaweed lab, is to produce a tincture of iodine by extracting Iodide and other components (seen when a mixture of iodine is present), from seaweed. We
These tests consisted of a wafting test, a solubility test in deionized water, and a pH test. The unknown’s characteristics, discovered through the physical tests, were then compared with known cations: Sodium, Potassium, Calcium, Ammonia, and Magnesium. Flame tests were performed in order to classify the unknown cation. A small amount of the solid unknown ionic compound was placed on a watch glass. A wet swab was used to collect a small sample of the compound.