Introduction Chemical change is when new chemical substances are made through change, with bonds between molecules being made or broken. To find whether there has been any chemical change in substances there are many signs, the most common 5 being colour change, an odour, change in temperature, gas being changed and the formation of a solid. Baking uses a wide range of techniques to create products, including chemical reaction, often through baking powder. Baking powder has a formula of NaHCO_3+H^+→Na^++CO_2+H_2
Breanna Kinley Ms. Linsey Chemistry Pd 5 6 October 2014 Qualitative Observation of a Chemical Reaction Purpose To understand a qualitative observation of a chemical reaction. Question How does a flame burn? Hypothesis If you burn Paraffin then it will undergo a combustion reaction. Materials 250 mL beaker Cobalt chloride paper scissors 250 mL Erlenmeyer flask Aluminum Paper 10 mL graduate 2 glass squares safety
Acid-Base Titration Lab Report By Andjela Mandic 11/24/14 Period 1 Purpose: The purpose of this experiment was to find the molarity of a sodium hydroxide (NaOH) solution by titrating it with a Hydrochloric Acid (HCl) solution. Materials: Burets (50mL), Buret Stand, Buret Clamp, Graduated Cylinder (10mL), Erlenmeyer Flask (125mL), Index Card, Beakers (250mL), Safety Goggles, Aprons, 0.100M HCl (standard solution), NaOH (concentration unknown), Distilled Water, Indicator (bromothymol
Using Chemical Reagents and Indicators to Determine the Presence of Macromolecules Nutrients in Unknown Solutions Abstract: To use chemical reagents to test for simple sugars and starch, proteins, and fats in the multiple procedure lab. Important equipment that was involved in this experiment included the chemical reagents such as Benedict’s reagent and Lugol’s solution for carbohydrates, Sudan IV indicator for lipids and Biuret reagent for proteins because these reagents determined the colour
The purpose of this lab is to attempt to verify two of the three important chemical laws, The law of conservation of mass, The law of definite proportions, and the law of multiple proportions. The laws are verified through observation of the reaction between iodine and zinc. This lab also helps to hone laboratory and massing skills. this lab includes both qualitative observation and quantitative gravimetric data. Background Questions 1. For each of the three important chemical laws, briefly explain
Chemical bond is an attraction between atoms, which can form chemical substances that contain several atoms. It holds atoms or ions together in a compound. The attraction’s electrostatic force between opposite charges causes the bond. There are three types of chemical bonds and they are covalent bond, ionic bond, and metallic bond. According to the textbook, ionic bonds have high melting points, and conduct electricity only when it is in solution or molten. Metallic solids are also good conductors
Background: Enzymes are defined as proteins which allow some chemical reactions to take place much quicker than like reactions would occur. Enzymes are not changed by the reaction therefore they can be recycled over and over again. Enzymes function as a catalysts meaning that they speed up the rate of the metabolic process (Royal). The site where the product and substrate come together is called is the active site. Each enzyme accelerates a specific reaction and requires a specific enzyme; end
technique to use when withdrawing a desired substance from a mixture of chemical substances. As a rule, the top layer is less dense than the bottom layer. In this experiment, impurities such as chlorophyll, cellulose, and flavornoids are in the top aqueous layer and caffeine is the bottom organic layer. Caffeine is a known water-soluble compound, which makes it difficult to extract from chemical substances found in tealeaves. These chemical substances include, cellulose, an almost insoluble polymer of glucose
7/26/15 Date Performed: 7/24/15 Lab Section: Chem-180 Course Instructor: Professor Lea Stage Purpose The purpose of this experiment is to have the chance to learn about how gases react with certain conditions such as heat, a glowing splint, limewater, and bromothymol blue as well as creating gases by combining different substances and being able to identify the gases produced. Procedure Lab manual
The effects on rate of reaction of enzymes when changes in temperature, pH and enzyme concentration occur Abstract The purpose of this lab was to test the effect a change in temperature, pH and enzyme concentration has on the rate of reaction of enzymes. The enzyme being studied is known as catalase, and it is used to speed up the reaction that breaks down hydrogen peroxide into water and oxygen. Using enzyme rich liver and reacting it with solutions of various temperatures, pH, and concentrations