LAB 4 Observations of Chemical and Physical Change Part 1

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

Organic Chemistry Lab I and II GUIDELINES FOR WRITING LAB REPORTS INTRODUCTION Writing reports in organic chemistry lab may differ from the way it’s done in general chemistry. One goal of this course is to introduce you to the record keeping methods used in research labs. Such methods are designed to organize experimental data in a format similar to that required for publication in major scientific journals. Here are some important considerations that apply in research settings. 1. Your work is unique

Title: Physical and Chemical Changes Purpose: Recognize and distinguish between chemical and physical changes Apparatus and Material: evaporating dish, Bunsen burner, wood splint, test tubes, micro spatula, dropper, mortar and pestle, test tube holder, safety goggles, lab apron. Piece of paper, NaCl (sodium chloride), water, 6 M HCL (hydrochloric acid), 0.1 M AgNO3 (silver nitrate), Mg ribbon, 6 M HCL (hydrochloric acid), CuSO4 5 H2O, 0.50g iron fillings, 0.50g of powdered sulfur, magnet,

Purpose: The purpose of this lab is to develop a deeper understanding of LeChatelier’s Principle by observing several systems at chemical equilibrium and interpreting the effects of varying concentrations and temperature. The principle states that if systems at equilibria are altered or disturbed in any form, the equilibria will shift to reduce the disturbing influence ( Catalyst, 186). In a 3 part experiment, we analyzed the outcome of changes in reactant and product concentrations, equilibrium

Classification of Chemical Reactions Lab Purpose: I. The objective of this laboratory experiment is to be able to identify and precisely classify each reaction as one of the five different types of chemical reactions by comparing the reactants from the product. II. The purpose of this laboratory experiment is to accurately calculate quantities of the products and the reactants, Aluminum and Copper (II) Chloride, in the chemical reaction to determine its percent yield. Data Tables: I. Reaction #1 Observation

1. Accurately records experimental procedures. I think this objective means that we need to make sure we understand the procedure or steps for the lab. Knowing the steps for the lab is extremely important because especially in chemistry if something is done out of order it can be dangerous. So recording the procedure in our lab book is important. This relates to my major of Political Science in that in Political Science, recording down things accurately is very important and if something isn’t recorded

off light and heat. Burning is a chemical change for new substances are created that cannot changed back are formed. Oxygen is needed for combustion or also called rapid oxidation. When oxygen is added, it causes a fire to burn hotter and faster. In this lab both wood and steel wool were burned in pure oxygen and air. Wood is mixture of many substances but for this lab we will focus on the cellulose aspect for the chemical equation. Cellulose has the same chemical formulation as sugar of C6H12O6

Analytical Chemistry I 1 Course Outlines         LU1 :Analytical Chemistry Overview LU2: Measurements and Data Treatment LU3: Stoichiometric Calculations LU4: General Concepts of Chemical Equilibrium LU5: Gravimetric Methods LU6: Acid-Base Equilibria LU7: Acid-base titrations LU8: Analytical Separations Course Assessment Laboratory reports (15%)  Assignments (15%)  MidTerm Examination (30%)  Final Examination (40%)  3 References 1. Christian, G.D. (2003)

Qualitative Observation of a Chemical Reaction Purpose: Carefully observe and interpret a chemical reaction. Apparatus: Equipment- 250mL beaker, 125mL Erlenmeyer flask, cardboard square, chemical scoop, metric ruler, lab countertop, rubber stoppers, safety goggles, lab apron Materials- candle ( 2cm diameter), matchbook, 2 toothpicks, Limewater solution, string, aluminum foil, Cobalt Chloride paper Procedure: Note appearance, odor, and feel of the unlighted candle. Heat the bottom of the candle

***SAFETY PROCEDURE*** WEAR YOUR SAFETY GOGGLES AND APRON. PHYSICAL AND CHEMICAL CHANGES Purpose: In this experiment you will observe some physical and some chemical changes. You will observe that energy must be used to start some chemical reactions, and that it is produced in others. Apparatus: Forceps Bunsen burner Funnel Wire gauze Crucible tongs Filter paper Test tubes, large and small Universal clamp Test tube rack Stirring rod Ring stand and ring Materials: