Chemical tests

“Classifying Chemical Reactions - Lab Report” I - Introduction - Chemistry is the study of the composition, structure, properties and change of matter. In chemistry, chemical and physical changes are used to help scientists understand how different substances react given various circumstances. A chemical change is any change resulting in the formation of a new chemical substance(s). A physical property is any change that does not involve the chemical makeup of a substance at all. In total…

The problem being tested is how do different chemicals, such as ammonium chloride, calcium chloride, and sodium chloride, affect the temperature of the water? The hypothesis being studied is, if three grams of calcium chloride is mixed with 50.0mL of water, then the temperature will decrease because there are more atoms in calcium chloride than in ammonium chloride and sodium chloride. The independent variables is the type of chemical and the dependent variable is the change in the temperature…

molecular structure. To do this we used four different chemicals, all with the same molecule but just with different subscripts. To preform this experiment, we were required to use a hot plate, water bath, alcohols, ketones, and alkalines, a test tube, capillaries, and a test tube cap. Once the water was boiling, we lowered the test tube into the water and waited until the chemical began to boil. Once the chemical began to boil we removed the test tube from the water bath. Finally we needed to…

through the process of a chemical change.it is important to understand their chemical properties in order to put it in the correct container that is appropiate. This means that the temperature, pressure, and concentration must remain consistent throughout time. However, a chemical change is sometimes required in order to understand the substance better. For example, some chemicals may need to be introduced to fingerprints which may not be visible to the eye. When chemicals are added to it, it…

this lab is to find out how rate of reactions are affected by volume affects and determine which chemical affects the solution rate of reaction. Temperature was also a factor in discovering how it will affect the speed of the reaction. This was done by gathering certain chemicals and mixing them into a test tube then recording how long it took to change color. Temperature was tested by placing the test tube in ice water over a hot plate and slowlying increasing the temperature. Sodium…

A clean flame test wire was inserted into 0.2 M NaCl and also placed on the flame reputedly. A bright yellow persistent flame was a positive test of sodium being presented, then repeat the same instructions for the unknown ion. After the flame test wire was clean 0.2M KCl was dipped into the flame resulted a lavender color after several trials as well as the unknown solution. 10 drops of 0.1M Ca(NO3)2 in a test tube and 2-3 drops of 1M Na2C2O4, a white precipitate of calcium was present. The…

In this project the aim is to determine the equilibrium constant (Kc) of a weak base when it reacts with a weak acid. The chemicals I wish to determine the equilibrium constant for are, Ethanoic acid (CH3COOH) and Propanol (C3H7OH). To accomplish this, the first question we must ask is, “what is an equilibrium constant and how is it determined”? There are 2 different types of equilibrium. The first, and the type we shall be using is known as homogeneous equilibrium which has everything present…

where to recognize when a chemical reaction has occurred and practice collecting detailed observations in the laboratory using proper scientific terms. Reaction set #1 (1a) place approximately 1 ml of 0.1 M Pb (No3)2 solution into a test tube. Then sequentially add drops of 0.25M k2CRO4 solution until you see evidence of a chemical reaction. The products of this reaction are aqueous KNO3 and solid PbCrO4. (1b) place approximately I ml of .1M Pb (NO3)2 solution in a test tube. Then sequentially…

Amylase Laboratory Report Introduction: Enzymes are a catalytic protein in a quaternary structure, that helps with the acceleration of molecules called substrates to achieve its desired chemical reaction. In this lab we used a specific enzyme called amylase. According to the lab manual, amylase is an enzyme found in one’s saliva or the pancreas to accelerate metabolism and cause a spontaneous reaction that helps with digestion of a substrate called starch. In order for any polymer such as…

Clock reactions are an appealing way to show different type of chemicals having a reaction towards each other. This type of chemical reaction shows the demonstration of chemical kinetics. Iodine clock reactions were discovered by Swiss chemist Hans Heinrich Landolt in 1886. The procedure of conducting an iodine clock reaction consist of two colourless chemicals being mixed together. After a short period of time the two colourless chemicals will react with each other causing there to be a colour…